Mid 2011 Macbook Air - Yosemite keyboard and trackpad stopped working, the only button that worked was the power button, only one USB port works.

I have a Mid 2011 Macbook Air.
Upgraded to Yosemite last week.
Three days ago I was using my Macbook Air for the first time since upgrading to Yosemite. I had been using my Macbook Air for approximately 30 minutes, I was using safari and the keyboard and trackpad stopped working (would not respond). The only button that worked was the power button.
I rebooted and they were still not working. I plugged in a USB mouse and external USB keyboard, only one USB port would work (the Left USB port if looking at the screen) so I had to swap between keyboard and mouse.
After logging in there is a bluetooth icon at the top of the screen with a sawtooth line through it. Bluetooth is unavailable and the bluetooth icon is missing from the system preferences menu.
If I run a hardware test by holding D (on USB keyboard) at startup it says that no problems are found and at the conclusion of the test the keyboard and trackpad start working again. When I log on the bluetooth is working again.
I shut down the Macbook Air and when I started it again the keyboard and trackpad and right side USB ports were all not working again. I logged in using the USB keyboard and mouse and the bluetooth not available sawtooth icon had returned.
I ran the hardware test again and at the conclusion of the test the trackpad and keyboard started working again.
I have tried deleting com.apple.Bluetooth.plist and com.apple.Bluetooth.plist.lockfile from /Library/Preferences/ and tried resetting SMC and Power Functions but this did not fix the issue. The only thing that seems to work is running a hardware test - obviously I don't want to do this every time I use the computer.
I do not believe any hardware is faulty/damaged - I think it has something to do with bluetooth/Yosemite.
I do not have the Macbook with me at the moment, if you have suggestions that I can try or additional checks/info you require please let me know and I can get back to you.
Thanks,
John

Hi!
I have exactly the same problem, and I can't find any solution.
I can't even track down the root of the problem: the Bluetooth/Wifi module? The trackpad? The keyboard/top case? The logicboard?
I've tried all the usual: SMC/PRAM reset, clean install, kext cache clearing.
Any suggestion is greatly appreciated!

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Hello Alaskanpro,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Best of luck,
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Sorry, must have been the crackpipe I smoked last night! LOL
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ADDENDUM STEP:
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Mid 2011 Macbook Air constant crashing

Hello,
I am experiencing random kernel panics with my Mid 2011 Macbook Air.
I have taken the laptop in to an Apple store where it passed every single test and they could not find anything wrong with it.
However, there clearly is something wrong with it. There have been times where it hasn't kernel paniced for a couple of weeks, but then it starts back up again. I have pasted below the first panic of this evening, which was then followed by 7 more whilst restarting and after logging back in.
I am currently using the laptop in safe mode, I have not used it long enough to know if this stops the kernel panics or not, but it does seem more stable.
I am now unsure what I can now do from here. Apple cannot find anthing wrong with the laptop that I have only had for 18 months, but this is clearly not fit for purpose if it cannot run OSX without crashing, something is wrong.
Where can I go from here? I can't carry on using this laptop for work it's that bad.
Thank you for your time.
Wed Aug 7 20:03:52 2013
panic(cpu 3 caller 0xffffff80018b8655): Kernel trap at 0xffffff8001887eec, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0x0000000000000030, CR3: 0x000000012dc70062, CR4: 0x00000000000606e0
RAX: 0x0000000000000001, RBX: 0x0000000000000008, RCX: 0xffffff800eff9b58, RDX: 0x0000000000000421
RSP: 0xffffff8008e83d00, RBP: 0xffffff8008e83d20, RSI: 0x000000001954fc40, RDI: 0xffffff80048a6ca0
R8: 0x0000000000000001, R9: 0x0000000000000000, R10: 0x000000007d585000, R11: 0x00000000ffffffff
R12: 0xffffff80048a6ca0, R13: 0xffffff801260ca40, R14: 0xffffff8011c378e0, R15: 0x0000000000048000
RFL: 0x0000000000210202, RIP: 0xffffff8001887eec, CS: 0x0000000000000008, SS: 0x0000000000000000
Fault CR2: 0x0000000000000030, Error code: 0x0000000000000000, Fault CPU: 0x3
Backtrace (CPU 3), Frame : Return Address
0xffffff8008e839a0 : 0xffffff800181d626
0xffffff8008e83a10 : 0xffffff80018b8655
0xffffff8008e83be0 : 0xffffff80018ce17d
0xffffff8008e83c00 : 0xffffff8001887eec
0xffffff8008e83d20 : 0xffffff8001875c0f
0xffffff8008e83d90 : 0xffffff80018632da
0xffffff8008e83f20 : 0xffffff80018b8aa0
0xffffff8008e83fb0 : 0xffffff80018ce0a1
BSD process name corresponding to current thread: Google Chrome
Mac OS version:
12E55
Kernel version:
Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64
Kernel UUID: 896CB1E3-AB79-3DF1-B595-549DFFDF3D36
Kernel slide:     0x0000000001600000
Kernel text base: 0xffffff8001800000
System model name: MacBookAir4,2 (Mac-742912EFDBEE19B3)
System uptime in nanoseconds: 23991642110646
last loaded kext at 14593131193430: com.apple.iokit.SCSITaskUserClient          3.5.5 (addr 0xffffff7f834c3000, size 36864)
last unloaded kext at 15049147349172: com.apple.driver.AppleUSBCDC          4.1.23 (addr 0xffffff7f834bc000, size 12288)
loaded kexts:
org.virtualbox.kext.VBoxNetAdp          4.2.12
org.virtualbox.kext.VBoxNetFlt          4.2.12
org.virtualbox.kext.VBoxUSB          4.2.12
org.virtualbox.kext.VBoxDrv          4.2.12
com.apple.filesystems.smbfs          1.8.4
com.apple.filesystems.afpfs          10.0
com.apple.nke.asp_tcp          7.1.0
com.apple.driver.AppleBluetoothMultitouch          75.19
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.filesystems.autofs          3.0
com.apple.iokit.IOBluetoothSerialManager          4.1.4f2
com.apple.driver.AGPM          100.12.87
com.apple.driver.ApplePlatformEnabler          2.0.6d1
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.driver.AppleHDA          2.3.7fc4
com.apple.driver.AppleSMCLMU          2.0.3d0
com.apple.driver.AppleBacklight          170.2.5
com.apple.driver.AppleSMCPDRC          1.0.0
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.4f2
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.AppleMikeyDriver          2.3.7fc4
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.ApplePolicyControl          3.4.5
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.driver.AppleIntelHD3000Graphics          8.1.2
com.apple.driver.AppleMCCSControl          1.1.11
com.apple.driver.AppleIntelSNBGraphicsFB          8.1.2
com.apple.driver.AppleUSBTCButtons          237.1
com.apple.driver.AppleUSBTCKeyboard          237.1
com.apple.driver.AppleUSBCardReader          3.1.7
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          34
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.3.1
com.apple.driver.AppleUSBHub          5.5.5
com.apple.driver.AirPort.Brcm4331          615.20.17
com.apple.driver.AppleAHCIPort          2.5.2
com.apple.driver.AppleUSBEHCI          5.5.0
com.apple.driver.AppleEFINVRAM          1.7
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleACPIButtons          1.7
com.apple.driver.AppleHPET          1.8
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.7
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
com.apple.nke.applicationfirewall          4.0.39
com.apple.security.quarantine          2.1
com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
com.apple.security.SecureRemotePassword          1.0
com.apple.driver.IOBluetoothHIDDriver          4.1.4f2
com.apple.driver.AppleMultitouchDriver          235.29
com.apple.kext.triggers          1.0
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.driver.DspFuncLib          2.3.7fc4
com.apple.iokit.IOAudioFamily          1.8.9fc11
com.apple.kext.OSvKernDSPLib          1.6
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.4f2
com.apple.iokit.IOSurface          86.0.4
com.apple.iokit.IOBluetoothFamily          4.1.4f2
com.apple.driver.AppleGraphicsControl          3.4.5
com.apple.driver.AppleHDAController          2.3.7fc4
com.apple.iokit.IOHDAFamily          2.3.7fc4
com.apple.driver.AppleSMC          3.1.4d2
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.IOPlatformPluginFamily          5.3.0d51
com.apple.driver.AppleSMBusPCI          1.0.11d0
com.apple.driver.AppleSMBusController          1.0.11d0
com.apple.iokit.IONDRVSupport          2.3.7
com.apple.iokit.IOGraphicsFamily          2.3.7
com.apple.driver.AppleThunderboltDPInAdapter          1.8.9
com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.9
com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.6
com.apple.driver.AppleUSBMultitouch          237.3
com.apple.iokit.IOUSBHIDDriver          5.2.5
com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.5
com.apple.iokit.IOUSBMassStorageClass          3.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
com.apple.driver.AppleUSBMergeNub          5.5.5
com.apple.driver.AppleUSBComposite          5.2.5
com.apple.iokit.IO80211Family          530.4
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOAHCIFamily          2.3.1
com.apple.iokit.IOUSBUserClient          5.5.5
com.apple.driver.AppleThunderboltNHI          1.7.8
com.apple.iokit.IOThunderboltFamily          2.4.0
com.apple.iokit.IOUSBFamily          5.6.0
com.apple.driver.AppleEFIRuntime          1.7
com.apple.iokit.IOHIDFamily          1.8.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          220.3
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          345
com.apple.iokit.IOStorageFamily          1.8
com.apple.driver.AppleKeyStore          28.21
com.apple.driver.AppleACPIPlatform          1.7
com.apple.iokit.IOPCIFamily          2.7.3
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0

Hello Kappy,
I do not have anything plugged in to the laptop.
Booting into safe mode does seem more stable, but I am unable to use safe mode for prolonged periods of time to test it.
I have completely uninstall VirtualBox from my my machine since my previous post, and I am still getting kernel panics. Here is the most recent.
Interval Since Last Panic Report: 21214 sec
Panics Since Last Report:          9
Anonymous UUID:                    35B92A7D-0252-11F8-7C64-E4B8C71598EC
Wed Aug 7 21:46:28 2013
panic(cpu 0 caller 0xffffff800cab8655): Kernel trap at 0xffffff800ca87eec, type 14=page fault, registers:
CR0: 0x0000000080010033, CR2: 0x0000000000000030, CR3: 0x000000000eaa2000, CR4: 0x00000000000606e0
RAX: 0x0000000000000001, RBX: 0x0000000000000008, RCX: 0xffffff80173d4f68, RDX: 0x0000000000000421
RSP: 0xffffff808beab800, RBP: 0xffffff808beab820, RSI: 0x000000001954fc40, RDI: 0xffffff800f88bca0
R8: 0x0000000000000001, R9: 0x0000000000000001, R10: 0xffffff800d0bdc60, R11: 0x0000000000001600
R12: 0xffffff800f88bca0, R13: 0xffffff808beab980, R14: 0xffffff801893b300, R15: 0x0000000000268000
RFL: 0x0000000000010202, RIP: 0xffffff800ca87eec, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x0000000000000030, Error code: 0x0000000000000000, Fault CPU: 0x0
Backtrace (CPU 0), Frame : Return Address
0xffffff808beab4a0 : 0xffffff800ca1d626
0xffffff808beab510 : 0xffffff800cab8655
0xffffff808beab6e0 : 0xffffff800cace17d
0xffffff808beab700 : 0xffffff800ca87eec
0xffffff808beab820 : 0xffffff800ca82296
0xffffff808beabb70 : 0xffffff800ca5e9a4
0xffffff808beabbd0 : 0xffffff800ce541bf
0xffffff808beabcc0 : 0xffffff800ce543c2
0xffffff808beabcf0 : 0xffffff7f8e1751dc
0xffffff808beabd60 : 0xffffff7f8e167408
0xffffff808beabd70 : 0xffffff7f8e14bef4
0xffffff808beabdb0 : 0xffffff7f8e14a765
0xffffff808beabde0 : 0xffffff7f8e14d99c
0xffffff808beabe00 : 0xffffff7f8d4622a4
0xffffff808beabe20 : 0xffffff7f8d462237
0xffffff808beabe50 : 0xffffff7f8e161cd1
0xffffff808beabe80 : 0xffffff7f8e14ae28
0xffffff808beabed0 : 0xffffff7f8e1492e9
0xffffff808beabef0 : 0xffffff800ce48588
0xffffff808beabf30 : 0xffffff800ce4708a
0xffffff808beabf80 : 0xffffff800ce471b9
0xffffff808beabfb0 : 0xffffff800cab3137
      Kernel Extensions in backtrace:
         com.apple.driver.AppleIntelHD3000Graphics(8.1.2)[2AAECC61-71E4-3226-ACD7-BDA8FE D0185C]@0xffffff7f8e146000->0xffffff7f8e1a7fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.3)[1D668879-BEF8-3C58-ABFE-FAC6B3E9A292]@0xffff ff7f8d046000
            dependency: com.apple.iokit.IONDRVSupport(2.3.7)[6C8CFC18-75F0-3DEF-86C7-CEB2C1FD6BB1]@0xff ffff7f8d565000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.7)[990D1A42-DF16-3AB9-ABC1-6A88AC142244]@0 xffffff7f8d522000
         com.apple.iokit.IOSurface(86.0.4)[C1007599-42D0-32FF-9F2F-C63F4E6C1DEB]@0xfffff f7f8d45e000->0xffffff7f8d46ffff
BSD process name corresponding to current thread: kernel_task
Mac OS version:
12E55
Kernel version:
Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64
Kernel UUID: 896CB1E3-AB79-3DF1-B595-549DFFDF3D36
Kernel slide:     0x000000000c800000
Kernel text base: 0xffffff800ca00000
System model name: MacBookAir4,2 (Mac-742912EFDBEE19B3)
System uptime in nanoseconds: 1925370520359
last loaded kext at 10263390705: com.apple.driver.AppleBluetoothMultitouch          75.19 (addr 0xffffff7f8e2db000, size 77824)
last unloaded kext at 194797783308: org.virtualbox.kext.VBoxDrv          4.2.12 (addr 0xffffff7f8e525000, size 270336)
loaded kexts:
com.apple.driver.AppleBluetoothMultitouch          75.19
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.ApplePlatformEnabler          2.0.6d1
com.apple.driver.AGPM          100.12.87
com.apple.iokit.IOBluetoothSerialManager          4.1.4f2
com.apple.driver.AppleHDA          2.3.7fc4
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.driver.AppleSMCLMU          2.0.3d0
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.ApplePolicyControl          3.4.5
com.apple.driver.AppleSMCPDRC          1.0.0
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.1.4f2
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.driver.AppleLPC          1.6.0
com.apple.driver.AppleBacklight          170.2.5
com.apple.driver.AppleMCCSControl          1.1.11
com.apple.driver.AppleMikeyDriver          2.3.7fc4
com.apple.driver.AppleIntelHD3000Graphics          8.1.2
com.apple.driver.AppleIntelSNBGraphicsFB          8.1.2
com.apple.driver.AppleUSBTCButtons          237.1
com.apple.driver.AppleUSBTCKeyboard          237.1
com.apple.driver.AppleUSBCardReader          3.1.7
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          34
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.3.1
com.apple.driver.AppleUSBHub          5.5.5
com.apple.driver.AirPort.Brcm4331          615.20.17
com.apple.driver.AppleAHCIPort          2.5.2
com.apple.driver.AppleUSBEHCI          5.5.0
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleEFINVRAM          1.7
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleACPIButtons          1.7
com.apple.driver.AppleHPET          1.8
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.7
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
com.apple.nke.applicationfirewall          4.0.39
com.apple.security.quarantine          2.1
com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
com.apple.driver.IOBluetoothHIDDriver          4.1.4f2
com.apple.driver.AppleMultitouchDriver          235.29
com.apple.kext.triggers          1.0
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.driver.DspFuncLib          2.3.7fc4
com.apple.iokit.IOAudioFamily          1.8.9fc11
com.apple.kext.OSvKernDSPLib          1.6
com.apple.iokit.IOSurface          86.0.4
com.apple.iokit.IOBluetoothFamily          4.1.4f2
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.1.4f2
com.apple.driver.AppleSMC          3.1.4d2
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.IOPlatformPluginFamily          5.3.0d51
com.apple.driver.AppleGraphicsControl          3.4.5
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.driver.AppleSMBusController          1.0.11d0
com.apple.driver.AppleSMBusPCI          1.0.11d0
com.apple.driver.AppleHDAController          2.3.7fc4
com.apple.iokit.IOHDAFamily          2.3.7fc4
com.apple.iokit.IONDRVSupport          2.3.7
com.apple.iokit.IOGraphicsFamily          2.3.7
com.apple.driver.AppleThunderboltDPInAdapter          1.8.9
com.apple.driver.AppleThunderboltDPAdapterFamily          1.8.9
com.apple.driver.AppleThunderboltPCIDownAdapter          1.2.6
com.apple.driver.AppleUSBMultitouch          237.3
com.apple.iokit.IOUSBHIDDriver          5.2.5
com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.5
com.apple.iokit.IOUSBMassStorageClass          3.5.1
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.5
com.apple.driver.AppleUSBMergeNub          5.5.5
com.apple.driver.AppleUSBComposite          5.2.5
com.apple.iokit.IOUSBUserClient          5.5.5
com.apple.iokit.IO80211Family          530.4
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOAHCIFamily          2.3.1
com.apple.driver.AppleThunderboltNHI          1.7.8
com.apple.iokit.IOThunderboltFamily          2.4.0
com.apple.iokit.IOUSBFamily          5.6.0
com.apple.driver.AppleEFIRuntime          1.7
com.apple.iokit.IOHIDFamily          1.8.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          220.3
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          345
com.apple.iokit.IOStorageFamily          1.8
com.apple.driver.AppleKeyStore          28.21
com.apple.driver.AppleACPIPlatform          1.7
com.apple.iokit.IOPCIFamily          2.7.3
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
Model: MacBookAir4,2, BootROM MBA41.0077.B0F, 2 processors, Intel Core i5, 1.7 GHz, 4 GB, SMC 1.73f66
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 384 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x02FE, 0x45424A3230554638424353302D444A2D4620
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0xE9), Broadcom BCM43xx 1.0 (5.106.98.100.17)
Bluetooth: Version 4.1.4f2 12041, 2 service, 18 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD TS128C, 121.33 GB
USB Device: FaceTime Camera (Built-in), apple_vendor_id, 0x850a, 0xfa200000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfa100000 / 2
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x024d, 0xfa120000 / 5
USB Device: BRCM20702 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821f, 0xfa113000 / 7
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfd100000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8404, 0xfd110000 / 3

Mid-2011 Macbook Air with very slow wifi yet with OSX 10.9.1

Yes, I am opening yet another topic on this pretty old issue because I am too confused with all that I have read so far (as also have not found a recent case similar to mine).
I have a mid-2011 Macbook Air i5 13'.
My home wireless network works just fine and smooth with a Macbook Pro Core 2 Duo and a humble Acer Aspire One D270 netbook.
With my Macbook Air, connection is useless. If I want to search something on Google, I'd better off buying myself an air ticket and visiting their HQs to ask them personally to do the search.
I have tried some "workarounds" with no success. Sometimes the internet seems to get a bit better (I said *a bit*), but nothing even slightly near what I get with my other two computers.
Where should I begin from?

Please take all the following steps that you haven't already tried. Stop when the problem is resolved. Back up all data before making any changes.
Step 1
Take the applicable steps in this support article. The Wireless Diagnostics program generates a large file of information about your system, which would be used by Apple Engineering in case of a support incident. Don't post the contents here.
Step 2
Run Software Update and install all available updates for OS X or your computer's firmware.
Step 3
If you're not using a wireless keyboard or trackpad, disable Bluetooth by selecting Turn Bluetooth Off from the menu with the Bluetooth icon. If you don't have that menu, open the Bluetooth preference pane in System Preferences and check the box marked Show Bluetooth in menu bar. Test. Continue if you find that Wi-Fi is faster with Bluetooth disabled.
From that same menu, select Open Bluetooth Preferences. If the box labeled Discoverable is checked, uncheck it. Click the Advanced button, and in the sheet that opens, uncheck the top three boxes, if any are checked. Click OK. Enable Bluetooth and test again.
If the application called "Bluetooth Setup Assistant" is running, quit it (not applicable to OS X 10.9 or later.)
Step 4
Open the Network pane in System Preferences and make a note of your settings in the Wi-Fi service. It may be helpful to take screenshots of the various tabs in the preference pane. If the preference pane is locked, unlock it by clicking the padlock icon and entering your administrator password. Delete Wi-Fi from the service list on the left by selecting it and clicking the minus-sign button at the bottom. Then recreate the service by clicking the plus-sign button and following the prompts.
Step 5
Reset the System Management Controller.
Step 6
Make a "Genius" appointment at an Apple Store, or go to another authorized service center.

Mid 2011 Macbook Air Painfully slow.

Mid 2011 Macbook Air Painfully slow.
Hey everyone. I am writing about my 13 inch Mid 2011 Macbook Air.
Recently it has been extremely slow and on occasion has not started up.
I have reset the PRAM and SMC already, yet it is still very slow. I have a couple theories about what might have caused it, are they plausible?
Theory 1: It’s a software problem. I tried to upgrade to 10.8.2 but halfway through the upgrade the computer restarted and somehow I was still on 10.8.1. For fear of a big issue happening I didn’t try to upgrade again. Perhaps it is a flaw in Apple’s software update?
The important thing to note about this update is that I tried to install 10.8.2 around a month or two weeks BEFORE I started having problems. So if these issues were due to 10.8.2’s failed update then it certainly was a delayed reaction.
I would of course like to update to 10.8.2 BUT as my computer is acting EXTREMELY slow and having trouble turning on occasionally I am worried the software update will completely brick the machine. Is that possible? Should I actually finish through with the software update?
Theory 2: It was an electricity problem.
The computer died when I was sitting at a café plugged into their wall sockets. A few days later when I came back to the same spot with my old macbook which is now being used in lieu of the Air it suddenly turned black for a little while. Sensing it might be an electricity surge or something with their system I unplugged the cable. I am not sure if that was paranoia though.
Can an electricity surge or a bad outlet fry a computer? Can it fry the ram so the computer is extremely slow? Does that theory hold any water?
Thanks for your help diagnosing this problem.
All the best.

Please read this whole message before doing anything.
This procedure is a diagnostic test. It won’t solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
Third-party system modifications are a common cause of usability problems. By a “system modification,” I mean software that affects the operation of other software — potentially for the worse. The following procedure will help identify which such modifications you've installed. Don’t be alarmed by the complexity of these instructions — they’re easy to carry out and won’t change anything on your Mac.
These steps are to be taken while booted in “normal” mode, not in safe mode. If you’re now running in safe mode, reboot as usual before continuing.
Below are instructions to enter some UNIX shell commands. The commands are harmless, but they must be entered exactly as given in order to work. If you have doubts about the safety of the procedure suggested here, search this site for other discussions in which it’s been followed without any report of ill effects.
Some of the commands will line-wrap or scroll in your browser, but each one is really just a single line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, and you can then either copy or drag it. The headings “Step 1” and so on are not part of the commands.
Note: If you have more than one user account, Step 2 must be taken as an administrator. Ordinarily that would be the user created automatically when you booted the system for the first time. The other steps should be taken as the user who has the problem, if different. Most personal Macs have only one user, and in that case this paragraph doesn’t apply.
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
When you launch Terminal, a text window will open with a line already in it, ending either in a dollar sign (“$”) or a percent sign (“%”). If you get the percent sign, enter “sh” and press return. You should then get a new line ending in a dollar sign.
Step 1
Copy or drag — do not type — the line below into the Terminal window, then press return:
kextstat -kl | awk '!/com\.apple/{printf "%s %s\n", $6, $7}'
Post the lines of output (if any) that appear below what you just entered (the text, please, not a screenshot.) You can omit the final line ending in “$”.
Step 2
Repeat with this line:
sudo launchctl list | sed 1d | awk '!/0x|com\.(apple|openssh|vix)|edu\.mit|org\.(amavis|apache|cups|isc|ntp|postfix|x)/{print $3}'
This time, you'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning.
Note: If you don’t have a login password, you’ll need to set one before taking this step. If that’s not possible, skip to the next step.
Step 3
launchctl list | sed 1d | awk '!/0x|com\.apple|edu\.mit|org\.(x|openbsd)/{print $3}'
Step 4
ls -1A /e*/mach* {,/}L*/{Ad,Compon,Ex,Fram,In,Keyb,La,Mail/Bu,P*P,Priv,Qu,Scripti,Servi,Spo,Sta}* L*/Fonts 2> /dev/null
Important: If you formerly synchronized with a MobileMe account, your me.com email address may appear in the output of the above command. If so, anonymize it before posting.
Step 5
osascript -e 'tell application "System Events" to get name of every login item' 2> /dev/null
Remember, steps 1-5 are all drag-and-drop or copy-and-paste, whichever you prefer — no typing, except your password. Also remember to post the output.
You can then quit Terminal.

My mid-2011 MacBook Air bricks itself after 10.7.2 update

I have a new MacBook Air (11") that was working just great, until today. Today, I used Software Update to install the updates, which included 10.7.2 as well as the recue partition update.
I did everything you're supposed to do, and when it rebooted, the gray screen comes up, and it shows the spinny doohickey on the bottom showing that it's working. Then, suddenly, up pops a big "no" icon (the circle with the slash through it) after about 60 seconds.
It simply doesn't do anything after that.
Hard-power-off, wait, power-on, repeat, same thing.
So I reboot with cmd-R to get the rescue partition. It works fine; I ask it to re-install Mac OS X, which then takes about 45 minutes (argh). Finally, Mac OS X is back, the machine is nicely booted up, all my files are there, everything is good.. But of course, the reinstall took me back to 10.7.1.
All I want to do is upgrade my fricking iPhone to IOS 5.0, but I can't do that without knowing I can sync which requires iCloud which of course requires 10.7.2. So I *have* to re-do the upgrade.
Back to Software Update, back to installing 10.7.2. And .. 20 minutes later .. back to bricked MacBook Air.
What a waste of my time. What a failure, Apple. I'm very very very very very unhappy that I've wasted so much time just to update my damned iPhone to IOS 5. I'm still without an update. Now I'm trying to figure out how to move my iTunes to another machine -- not nearly as obvious as it should be. ARGH. I'm going to throw this MacBook Air off the balcony in about 10 minutes. :-(
Thanks for listening.
Steve

Wow, you're right -- I can't believe it. I just really can't believe they would screw up so badly, yet when I search for "10.7.2 filevault" I don't find more than a couple of articles about it on the web (including this thread). Why on earth wouldn't Apple have put up some kind of warning about this? I can't believe it, really. It's insane.
On my newly-functional 10.7.2 MBA, I wanted to test your theory and so I turned on filevault 2 and encrypted the main disk again. It of course wanted me to reboot. So I rebooted. And *blammy* -- same error / boot failure. Wow. Also, interestingly, even on a working 10.7.2 system, you can't mount a USB drive that was encrypted using Filevault 2 encryption (in Disk Utility, e.g., as a "Mac OS X, journalled, encrypted" volume that was encrypted with DiskUtility on Lion 10.7.1). I still have a 10.7.1 machine that I will not upgrade until I can at least decrypt the disk -- but right now, Disk Utility tells me it fails decrypting the external USB disk so I'm hosed!!! ARGH.
Now, going back to the booting problem after upgrade -- for anyone's reference who's still keeping score -- you can easily recover from the booting problem with upgrading a Filevault 2 root drive: Power-cycle the machine and then hold down cmd-r to bring up the Lion Recovery application. Within Lion Recovery, choose "Disk Utility", and then click on the (as yet unmounted, still encrypted) root hard drive to select it. Then go to the File menu, and choose "Turn off encryption" for this disk. It then prompts you for the password, and if you enter it, *blammy* you're back up and running again.
In my case, the disk had only just begun encrypting so the action was instant, and then once it confirmed the disk was now decrypted, I simply chose "Restart" from the Apple menu, and I was back in business (no hairy re-installs to deal with). If this is an already-encrypted volume, presumably it'll take you a bit longer (the normal 45-minutes to 2 hours) to decrypt it. But at least no more installing software -- it'll "just work".
Maybe I'll go post a simpler version of these instructinos on the other threads, but this is the simplest fix -- just turn off filevault 2 from within Lion Recovery, basically, and that fixes the boot problems.
Apple, if you're listening, you really really really need to say something to your users so they know. Many many many MBA users are likely to have still not upgraded. You can prevent them from hating you and your products by making sure they don't screw the pooch here. Short version: Mid-2011 MacBook Airs running Filevault 2 WILL NOT BOOT after 10.7.2 update; so users should turn off Filevault2 before upgrading.
Steve

My mid 2011 MacBook Air fell off my couch onto carpet. Slowed down.

I made a post a few weeks ago about how my mid 2011 MacBook Air slowed down randomly over night. A few days later it randomly started functioning properly again. I was stoked.
Today, I was using my MacBook on the couch, when it slipped off and landed on the carpet bottom up with the lid closed.
The moment I opened it up again, it was back to being slow again.
I ran the Disk Utility, tried repairing it, it said that the hard drive 'appeared to be ok'
But yeah. I'm gonna say it's a pretty safe to assume that the drop has everything to do with the slow response time.
Would anyone happen to know what actually might have went wrong, though?

I would think a poor connection of some sort, may be a plug and socket or a soldered joint problem. I think you need to take it in for repair, I cannot think it will be software that is causing the fault, but...... you never know.

HT6510 Mid-2011 Macbook Air doesn't support Air Drop/Continuity/Handoff?

Why does my mid-2011 Macbook Air not support Air Drop/Continuity/Handoff? It has Bluetooth 4.0, which is what I thought was the main requirement for getting these devices to work together. I also have an iPhone 6 Plus and a 4th gen iPad.

If you check your "System Information", it will tell you if Handoff is supported:
Click on  > About This Mac > System Report...
Under Hardware, click Bluetooth and check the "Handoff Supported" line

HT201343 Mid 2011 Macbook air will not mirror

I have a mid 2011 macbook air and a 2nd generation apple tv. All software is up to date. I can use air play in i-tunes on the macbook air, but there is no screen mirroring option in the main menu bar. Apple documentation says this model supports mirroring,(Intel Core i5) but the best I can get is "detect displays" on the top menu bar. Am I missing something?
(i-pad mirrors to ATV just fine)

Ted,
It is as Mirror is a function of Mountain Lion.
A third party app called airparrot will also work if it is only mirror you want.
Jules

Slow internet on mid 2011 macbook air

So my internet is intermittently slow on my macbook air. This has been happening for many months although I cannot remember if it corresponded with upgrading to OS X 10.9. It is sporadic and I cannot identify any precipitating causes or solutions. My internet speed will just randomly drop and then eventually will correct itself where I will have the 15mbps download speed that I am paying for through my ISP. When the internet speed drops I will average 0.6 - 1.5mbps on speediest.net. This seems to be only isolated to my mid 2011 macbook air as my other laptop - a PC, and my iPhone show regular speeds. I have called my ISP and router customer service departments many times with no help. I have replaced my wireless router. Please help.
Nothing has worked. I have tried everything that I can think of including:
1. Installed all OS updates - this seemed to work for about a day and then back to the same slow internet speed
2. restarting the computer
3. restarting in safe mode
4. uninstalled and reinstalled the wifi network
5. restart modem and router
6. replaced router with a new model
7. changed wireless security settings on wireless router and channels'
8. changed DNS to google 8.8.8.8 and 8.8.4.4
9 installed onyx and cleaned system
10. ran virus check
11. disabled safari plugins
12. deleted preferences.plist and networkinterfaces.plist
13 turned off bluetooth on mac
14. turned off wifi on all other devices
15. disabling and enabling wifi networks
16. run diagnostics on wifi - normal

run diagnostics on wifi - normal
It's not clear if that was the result of using Apple's Wireless Diagnostics. It may supply some additional helpful information.
To use it, hold an option key while you click your Mac's Wi-Fi icon, and choose Open Wireless Diagnostics...
The following authentication dialog will appear:
Authenticate with your Admin password, then click the Continue button in the following:
The network analysis and diagnostic tests will take several minutes to complete:
When it completes, if your wireless network is functioning properly the following will result:
If something is amiss, supposedly the results will be different and you will be presented with helpful information.
Assuming your connection is "working as expected" select Continue to summary and click Continue:
Ignore the pre-populated text field, which is provided as a place for you to type in additional information should Apple ask for it in the course of obtaining technical assistance from them. Apple has no way of knowing where your router is located in your home, and certainly doesn't know if you even have an upstairs bedroom closet.
Click Continue.
The next step will also take a few minutes:
When it finishes, you will be presented with a summary that may or may not be useful to you. Let me know if it is.
The WirelessDiagnostics-xxx.tar.gz file deposited on your Desktop can be dragged to the Trash, or you may wish to expand it and examine its contents. It's up to you.

Mid 2011 Macbook Air - Yosemite keyboard and trackpad stopped working, the only button that worked was the power button, only one USB port works.

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