T420s with large external monitor

I have a 420s with Intel HD 3000 graphics and would like to connect my 30in external monitor (NEC 3090). However the highest resolution I am able to select is 1920x1080 (wrong aspect ratio). I tried both the latest Lenovo drivers and the latest Intel drivers.
My research suggests that 1920x1200 should be supported, and that HD 3000 can technically support my monitors native 2560x1600 via displayport..
Attempts to create a custom resolution results in an error (something about lack of bandwidth). (Note that the T420s usually drives dual monitors - a 24in 1920x1080 (DVI) plus a 1280x1024 (VGA) - so I doubt that just going from 1080 to 1200 busts a bandwidth limit)
I tried both direct DVI (dual link) and displayport (to DVI via HDMI adapter) (using dock) but nothing allows me to see any option beyond 1920x1080.
1) What is the real limit on supported resolution for T420s?
2) If it's more than 1920x1080, how do I make it work?
THANKS!

Thanks again.
The NEC3090wxqi is a 30" monitor which normally supports 2560x1600, (it has dual DVI, no displayport)
The Lenovo 420s 4174 spec clearly states that 1920x1200 is supported, Here:
http://www.lenovo.com/shop/americas/content/pdf/system_data/t420s_tech_specs.pdf
However when I try to force 1920x1200 (using a custom resolution from the Intel graphics panel), I get a "exceeds bandwidth" message. Note that I normally drive a dual monitor setup: 1920x1080 PLUS 1280x1024 (using DVI and VGA from the dock), so I doubt that is a true physical limit.
(I also tried the latest Intel driver but that did not change anything.)
Is this a driver issue? Is there a registry edit that might remove this limitation?

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Processor Speed:
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Number Of Processors:
1
Total Number Of Cores:
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L2 Cache (per core):
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L3 Cache:
4 MB
Memory:
8 GB
Processor Interconnect Speed:
4.8 GT/s
Boot ROM Version:
MBP61.0057.B09
SMC Version (system):
1.58f16
Serial Number (system):
W80223V7AGZ
Hardware UUID:
3993F249-8480-5ABD-9846-88608D085469
Sudden Motion Sensor:
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Interval Since Last Panic Report: 687027 sec
Panics Since Last Report:          6
Anonymous UUID:                    EB3EFFB2-AFCE-472E-ADA1-F35EFF3C7BBA
Sat Oct 13 16:58:00 2012
panic(cpu 2 caller 0xa3dc9b): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xc0000000 0xa822c000 0x0a5480a2, D0, P2/4
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0x7c6f3888 : 0x21b837 (0x5dd7fc 0x7c6f38bc 0x223ce1 0x0)
0x7c6f38d8 : 0xa3dc9b (0xc5328c 0xcc3800 0xc61e60 0x0)
0x7c6f3978 : 0xb58608 (0xe50bc04 0xe80b004 0x100 0x0)
0x7c6f39c8 : 0xb4f601 (0xe80b004 0x100 0x7c6f39f8 0xa2d778)
0x7c6f39f8 : 0x175b9a6 (0xe80b004 0x100 0x438004ee 0x2b1f6a)
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0x7c6f3b78 : 0xa46e7c (0xe80b004 0xe80c004 0x0 0x0)
0x7c6f3c18 : 0xa4355b (0x0 0x9 0x0 0x0)
0x7c6f3dc8 : 0xa4542a (0x0 0x600d600d 0x702a 0x7c6f3df8)
0x7c6f3e98 : 0x9d9582 (0xc1d00011 0xaa910001 0x20802040 0x7c6f3ee0)
0x7c6f3ef8 : 0xd9b57d (0xe08fc00 0x7c6f3f4c 0x0 0x7)
0x7c6f3f58 : 0xd9b71a (0xe076800 0xda2e54 0x7c6f3f78 0x2a45c9)
0x7c6f3f78 : 0x230235 (0xe076800 0x0 0x0 0x6c03)
0x7c6f3fc8 : 0x2a179c (0x863ea0 0x0 0x10 0xe980a84)
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            dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x9ca000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x991000
         com.apple.nvidia.nv50hal(6.4.0)@0x1625000->0x1a39fff
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BSD process name corresponding to current thread: kernel_task
Mac OS version:
10K549
Kernel version:
Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36 PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386
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com.apple.driver.AppleUSBUHCI    4.2.0 (addr 0x1495000, size 0x65536) - last unloaded 209721117821
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foo.tun    1.0
foo.tap    1.0
com.parallels.kext.prl_vnic    6.0 11828.615184
com.parallels.kext.prl_netbridge    6.0 11828.615184
com.parallels.kext.prl_usb_connect    6.0 11828.615184
com.parallels.kext.prl_hid_hook    6.0 11828.615184
com.logmein.hamachi    1.0
com.parallels.kext.prl_hypervisor    6.0 11828.615184
com.paceap.kext.pacesupport.snowleopard    5.7.2
com.Apogee.driver.DuetFWOverideDriver    1.4.4
com.digidesign.iokit.DigiDal    9.0f4
com.AmbrosiaSW.AudioSupport    3.2
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com.apple.filesystems.autofs    2.1.0
com.apple.driver.AGPM    100.12.31
com.apple.driver.AppleMikeyHIDDriver    1.2.0
com.apple.driver.AppleHDA    2.0.5f14
com.apple.driver.AudioAUUC    1.57
com.apple.driver.AppleMikeyDriver    2.0.5f14
com.apple.driver.AppleUpstreamUserClient    3.5.7
com.apple.driver.AppleMCCSControl    1.0.20
com.apple.driver.SMCMotionSensor    3.0.1d2
com.apple.Dont_Steal_Mac_OS_X    7.0.0
com.apple.iokit.CHUDUtils    364
com.apple.iokit.CHUDProf    366
com.apple.driver.AudioIPCDriver    1.1.6
com.apple.driver.ACPI_SMC_PlatformPlugin    4.7.0a1
com.apple.driver.AppleGraphicsControl    2.10.6
com.apple.driver.AppleLPC    1.5.1
com.apple.kext.AppleSMCLMU    1.5.2d10
com.apple.GeForce    6.4.0
com.apple.driver.AppleIntelHDGraphics    6.4.0
com.apple.driver.AppleIntelHDGraphicsFB    6.4.0
com.apple.driver.AppleUSBTCButtons    201.6
com.apple.driver.AppleUSBCardReader    2.6.1
com.apple.driver.AppleUSBTCKeyboard    201.6
com.apple.driver.AppleIRController    303.8
com.apple.BootCache    31.1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib    1.0.0d1
com.apple.iokit.SCSITaskUserClient    2.6.8
com.apple.iokit.IOAHCIBlockStorage    1.6.4
com.apple.driver.AppleUSBHub    4.2.4
com.apple.driver.AppleFWOHCI    4.7.3
com.apple.driver.AirPortBrcm43224    428.42.4
com.apple.iokit.AppleBCM5701Ethernet    3.0.5b8
com.apple.driver.AppleEFINVRAM    1.4.0
com.apple.driver.AppleSmartBatteryManager    160.0.0
com.apple.driver.AppleAHCIPort    2.1.7
com.apple.driver.AppleUSBEHCI    4.2.4
com.apple.driver.AppleACPIButtons    1.3.6
com.apple.driver.AppleRTC    1.3.1
com.apple.driver.AppleHPET    1.5
com.apple.driver.AppleSMBIOS    1.7
com.apple.driver.AppleACPIEC    1.3.6
com.apple.driver.AppleAPIC    1.4
com.apple.driver.AppleIntelCPUPowerManagementClient    142.6.0
com.apple.security.sandbox    1
com.apple.security.quarantine    0
com.apple.nke.applicationfirewall    2.1.14
com.apple.driver.AppleIntelCPUPowerManagement    142.6.0
com.apple.driver.AppleProfileReadCounterAction    17
com.apple.driver.DspFuncLib    2.0.5f14
com.apple.driver.AppleProfileTimestampAction    10
com.apple.driver.AppleProfileThreadInfoAction    14
com.apple.driver.AppleProfileRegisterStateAction    10
com.apple.driver.AppleProfileKEventAction    10
com.apple.driver.AppleProfileCallstackAction    20
com.apple.driver.AppleSMBusController    1.0.10d0
com.apple.driver.AppleFWAudio    2.6.2fc2
com.apple.iokit.IOFireWireIP    2.0.3
com.apple.iokit.IOSurface    74.2
com.apple.iokit.IOBluetoothSerialManager    2.4.5f3
com.apple.iokit.IOSerialFamily    10.0.3
com.apple.iokit.CHUDKernLib    365
com.apple.driver.AppleHDAController    2.0.5f14
com.apple.iokit.IOHDAFamily    2.0.5f14
com.apple.iokit.IOAudioFamily    1.8.3fc2
com.apple.kext.OSvKernDSPLib    1.3
com.apple.iokit.AppleProfileFamily    41.4
com.apple.driver.IOPlatformPluginFamily    4.7.0a1
com.apple.driver.AppleSMBusPCI    1.0.10d0
com.apple.driver.AppleBacklightExpert    1.0.1
com.apple.driver.AppleSMC    3.1.0d5
com.apple.iokit.IOFireWireAVC    4.0.6
com.apple.nvidia.nv50hal    6.4.0
com.apple.NVDAResman    6.4.0
com.apple.iokit.IONDRVSupport    2.2.1
com.apple.iokit.IOGraphicsFamily    2.2.1
com.apple.driver.BroadcomUSBBluetoothHCIController    2.4.5f3
com.apple.driver.AppleUSBBluetoothHCIController    2.4.5f3
com.apple.iokit.IOBluetoothFamily    2.4.5f3
com.apple.iokit.IOUSBMassStorageClass    2.6.7
com.apple.driver.AppleUSBMultitouch    207.7
com.apple.iokit.IOUSBHIDDriver    4.2.0
com.apple.driver.AppleUSBMergeNub    4.2.4
com.apple.driver.AppleUSBComposite    3.9.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice    2.6.8
com.apple.iokit.IOBDStorageFamily    1.6
com.apple.iokit.IODVDStorageFamily    1.6
com.apple.iokit.IOCDStorageFamily    1.6.1
com.apple.iokit.IOSCSIBlockCommandsDevice    2.6.8
com.apple.driver.XsanFilter    402.1
com.apple.iokit.IOAHCISerialATAPI    1.2.6
com.apple.iokit.IOSCSIArchitectureModelFamily    2.6.8
com.apple.iokit.IOFireWireFamily    4.2.6
com.apple.iokit.IOUSBUserClient    4.2.4
com.apple.iokit.IO80211Family    320.1
com.apple.iokit.IONetworkingFamily    1.10
com.apple.iokit.IOAHCIFamily    2.0.6
com.apple.iokit.IOUSBFamily    4.2.4
com.apple.driver.AppleEFIRuntime    1.4.0
com.apple.iokit.IOHIDFamily    1.6.6
com.apple.iokit.IOSMBusFamily    1.1
com.apple.kext.AppleMatch    1.0.0d1
com.apple.security.TMSafetyNet    6
com.apple.driver.DiskImages    289.1
com.apple.iokit.IOStorageFamily    1.6.3
com.apple.driver.AppleACPIPlatform    1.3.6
com.apple.iokit.IOPCIFamily    2.6.5
com.apple.iokit.IOACPIFamily    1.3.0
Model: MacBookPro6,2, BootROM MBP61.0057.B09, 2 processors, Intel Core i7, 2.66 GHz, 8 GB, SMC 1.58f16
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.42.4)
Bluetooth: Version 2.4.5f3, 2 service, 19 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS545050B9SA02, 465,76 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: Hub, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: iPhone, 0x05ac (Apple Inc.), 0x12a0, 0xfa140000 / 6
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac (Apple Inc.), 0x0237, 0xfa120000 / 5
USB Device: Internal Memory Card Reader, 0x05ac (Apple Inc.), 0x8403, 0xfa130000 / 4
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, 0x05ac (Apple Inc.), 0x8218, 0xfa113000 / 9
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USB Device: IR Receiver, 0x05ac (Apple Inc.), 0x8242, 0xfd120000 / 4
USB Device: Built-in iSight, 0x05ac (Apple Inc.), 0x8507, 0xfd110000 / 3
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Macbook with lion; external monitor won't wake

I have a 2008 unibody aluminum 2.0 ghz MacBook with an Acer s232HL 23" external monitor. Lately I've noticed that the external monitor won't come back to me after I put the computer to sleep. I'm using Lion and a Dynex MiniDisplay Port to DVI adapter. I never used to have this problem with Snow Leopard, but I got Lion right after it came out, and I could swear this problem didn't really start until a week or two ago.
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Acer light goes back to blue and it cycles through its ports again before saying "no signal."
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Thanks,
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I notice that it reduce the amount of cicles it takes to recognize the monitor if you have display preferences open when you connect the monitor to the mac...
This is SO annoying!

Problems with an external monitor

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xrandr --output LVDS --off
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I usually activate the other screen (LVDS) and try to see if I can do anything.
when I type:
xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 2048 x 2048
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1680x1050 60.0 +
1920x1440 60.0
1856x1392 60.0
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1600x1200 75.0 70.0 65.0 60.0
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1152x768 54.8
1024x768 85.0 75.0 70.1 60.0
832x624 74.6
800x600 85.1 72.2 75.0 60.3 56.2
640x480 85.0 72.8 75.0 59.9
720x400 85.0
640x400 85.1
640x350 85.1
No matter what I do I cannot live reactivate the external monitor.
(usually I try with the classic :
xrandr --output VGA --auto
Inittially I thought it is a problem with the driver (i810) so I upgraded yesterday the whole system.
Even after I did that and used the new driver (intel) I still had much luck as I had an other blanking event today.
An other ideea is that this is caused by faulty bios, but it is just a guess
My present day solution: reboot (yes, full reboot, because restarting the xorg has not the intended effect)
Any ideas on what may cause this?
Any help would be appreaciated.
Last edited by tiberiur (2008-05-25 20:57:31)

display goes to sleep when colsed because there is a magnetic switch - small magnet opens the circuit.
if it stays on, either magnet was misplaced, some wire disconnected or the issue is with the switch circuit.
on some models switch is part of trackpad, if you have small magnet, try moving it over trackpad, see what it does.

Shadow artifacts when waking from sleep with an external monitor.

This problem happens when I have an external monitor connected, I put the MacBook to sleep, and then wake it up with the monitor still connected.
Upon waking, the shadow effects surrounding all of the windows get "corrupted"
The shadows look like TV static at the corners and black streaks along the sides. This effects all windows that were open and all new windows.
I imagine the bitmaps that are used for the shadows get corrupted on sleep for some reason.
I have some non-original ram installed right now, so I'll try reseating it and I'll try putting the original ram back in and let you guys know if it makes a difference.
Has anyone else had this problem?
MacBook 2GHz White Mac OS X (10.4.6) 21" IBM P260 @ 1600x1200

You might want to check the following links…
This is a MacBook link which suggests a lack of RAM is the cause…
http://discussions.apple.com/thread.jspa?threadID=485680
This is a Mac mini link (which was way too long for me to read in depth)…
http://discussions.apple.com/thread.jspa?threadID=394694
These links should describe both your issues and possible fixes.

Stop with an external monitor in Mavericks

I moved to MacBook PRO Retina 13" from a MacBook PRO late 2009.
Using an external monitor in Mavericks when unplugging power, the computer doesn't stop and the battery power slowly drains.
In the old MacOS X and with the old MacBook PRO once you disconnect the power the system was going to STOP mode.
Fast and Easy!
What is the correct way to manage the stop process using an external monitor if you want to unplug the power?
Please don't tell me to leave the power plugged and STOP by clicking the apple>stop button.
Thanks.

same as it ever was
do it like nothing is different.
be sure to have an external trackpad keyboard or mouse as you will loose them on the computer once it is closed.

T420s with large external monitor

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