USB Low power?

I have a few USB devices - some USB 1.1, some 2.0.
To support my device habit, I picked up a powered USB2 hub - I figured that would be enough, even for me.
For some annoying reason, however, when I plug something that needs the faintest, little bit of power into it, I get the USB Low Power warning - which renders it quite useless to me.
Example - the cradle for my Palm Pilot is fine, and works well - but my wacom tablet or my USB2 CF card reader - both of which have a little LED on them, generate the warning.
I know the hub is getting power - simply by seeing the little lights go out when I unplug it from the mains.
Devices plugged directly into the powerbook are fine - but 2 ports isn't enough.
I get the same result with a different powered hub (my old 4 port hub).
Anyone got any suggestions?

Hi Brad
You were overloading the keyboard bus, and should only connect one devices at a time to the keyboard.
If you are running short of usb ports here's a great little hub with a port on top for flashdrives.
Belkin 4 Port Hub
Dennis

Similar Messages

When I plug in a Lexar thumb drive, I get a "USB Low Power Notice' saying it cannot operate because it needs more power than is available. This is new. Thumb drives worked last week. Any suggestions? Is this an apple or a Lexar issue?

When I plug in a Lexar thumb drive, I get a "USB Low Power Notice' saying it cannot operate because it needs more power than is available. This is new. Thumb drives worked last week. Any suggestions? Is this an apple or a Lexar issue?

Apple intentional, use a powered USB hub instead.

USB "Low Power Notice" when booting up my G5 with a Belkin USB hub attached

I have a Belkin USB 2.0 hub (FSU237 Rev3) with an external ac adapter.
Everytime I reboot my G5 (running OS 10.4.6), this window pops up:
"USB Low Power Notice
The USB device cannot operate because it needs more power than is available.
To correct this problem you can:
1) Plug the device into an electrical outlet if it has a power cord.
2) Unplug the device and plug it into another USB port on your computer or other device that is plugged into a power cord."
I have tried the hub plugged into the USB jacks in the back of my G5 as well as the front one. It doesn't work. None of the items plugged into the hub show up on the desktop.
I have tried the items I have plugged into the hub (my shuffle and my treo phone with sync cable) by plugging them directly into my G5 (all ports) and they work fine. And I used this hub for months on my PC with no problems.
What could be going on?
PowerMac G5 Quad Mac OS X (10.4.6)

You may want to check System Profiler's USB section to see if the hub even shows up in there (you may have to refresh the list if you try different ports).
I bought one of these hubs for my Quad and it didn't show up at all in System Profiler. Exchanged it for a new one and everything was OK.

USB low power message

G4 (MDD) running OS X 10.4.11 - Just got a Zoom H2 digital recorder - when I try to connect to USB (via powered hub) I get a low-power warning and no luck connecting (even with the H2 plugged in via A/C). It works fine when I plug directly into the USB port in the back of the computer. There are only 2 USB ports on my G4 - my hub is in one USB port (has my printer and a couple of flash drives in it), and the other onboard port is for my keyboard. This does not seem to be a USB version issue, but rather an available-power issue (?) Can anyone please suggest a solution - do I need to add a USB card (PCI), and if so, what can you recommend for my system? Thanks in advance!!

Your Mac's USB ports are USB 1.1. Even if you didn't get the low power message, the video transfer would be very slow.
Suggest you install a USB 2.0 PCI card. See USB 2.0 PCI Cards
http://www.jcsenterprises.com/Japamacs_Page/Blog/B8B574BC-BB45-4B3E-9D9B-F97EBB3 230BC.html
Best bet is any card with a NEC PD720100 or PD720101 chipset Stick with the NEC chip, and try NOT to use drivers, Tiger and Leopard don’t need drivers.
All of these Cards are NEC chipset based
Adaptec 3100LP
BAFO BF-460
Belkin F5U220
GWC UC-160
IOGear GIC250U & GIC251U
Keyspan U2PCI-5
O'toLink U2-C2A, U2-C2B, U2-P20N & U2-P50
Ratoc PCIU5
USBWholesale UII-PCIP
I use an IOGear GIC251U in my G4 & have had no problems.
 Cheers, Tom

Apple Keyboard USB Low Power Issue

OK. I'm using a Windows machine and my G4 for a project and to save space and complexity I bought a Trendnet TK-207 USB switcher to use one keyboard, my G4's, and one mouse, a Mighty Mouse.
Both mouse and keyboard work fine powered by the HP machine but on the G4 side only the mouse works. MacOS thinks that the keyboard will draw too much current and so doesn't let it work. Since the keyboard works through the TK-207 I know that it doesn't physically draw too much but using System profiler I read that the TK-207 will supply 100mA and that the keyboard is asking for 250mA.
My question is this. Is there a way to fool MacOS into thinking that the keyboard requires less, which it does, so that I can have it plugged into the switcher all the time? Right now my work-around is to plug the keyboard directly into the G4 when I'm switched to the Mac side and to plug it back into the switcher when I'm using the HP. Not terrible but the one button push would be faster.
I've thought about buying a USB Y adapter to power the keyboard and have it inserted between the TK-207 and the keyboard. I would plug the 5V only side of the Y into a 500mA powered hub but I'm not sure MacOS would recognize that the keyboard would be getting power from another source since the data/power side of the Y would be plugged into the TK-207.
An odd situation, to be sure, but maybe someone out there knows more than I do - not really much of a stretch there. Thanks to anyone who may have an idea or could tell me that a Y adapter would work. After all, the cost of the adapter is only $15 so not much of an investment there.

I have done that. I also have tried plugging it in to a PCI USB 2.0 4-port card that according to system profiler should have 500mA available. I also have plugged it into a 7-port USB powered hub, again with 500mA/port available, with the same result, a "low power" message. It's definitely a software issue with MacOS since the keyboard works fine plugged into the kvm switch with the kvm switch getting its power from a usb port on the back of the HP computer. What I think is happening is that the embedded sofware in the kvm and the keyboard are being read by MacOS and since the kvm says it can only deliver 100mA and the hub in the keyboard says it can deliver 500mA, and the keyboard says it requires 250mA, MacOS won't let it operate. My workaround is simple, plug the keyboard directly into the built in USB port on the G4 when I'm using the Mac, but it sure would be nice to just toggle the computers using the kvm switch only.

USB Lowe Power warning.

Does anyone else get the error message
+01/03/09 3:19:20 PM kernel USB Notification: The device "DataTraveler 2.0" @ 0xfd531000 cannot operate because there is not enough power available+
when they plug in a memory stick into the aluminum keyboard port?

Funny thing is it works with iMac. But on the other hand I found out the reason for this. If I unplug the 30'' Cinema display USB hub from the Mac Pro, the keyboard hub gets enough power, and everything works. So I guess Mac Pro can't provide enough power to 2 USB hubs (one in the display and one in the keyboard). And this is true no matter which USB port they are plugged in at the back (I have not tried the front port, since I don't want to use those for the keyboard).

Problems with multiple USB devices. (Possible Low Power on USB Bus)

I believe I'm having an issue with the USB bus or one of my devices that I have installed on my iMac.
I purchased this iMac along with a printer (HP C4280 All-in-One) as part of a promotion deal. I also have wireless logitech USB mouse, and iPhone and an 80gb 5th Gen iPod.
My problem has to do with syncing the iPod and iPhone. Normally I have the printer attached to the iMac along with the USB mouse. Both devices function as expected. However I have problems when I connect the iPhone or iPod.
iPod Symptoms: When I connect the iPod the iPod screen shows the flashing red circle with a line but iTunes never launches and the iPod never syncs.
iPhone Symptoms: When I connect the iPhone the iPhone screen says Sync in Progress and iTunes does show the iPhone in the list of devices but a dialog appears giving me one of two messages (that I've seen so far) - [msg 1] Your iPhone is corrupt please disconnect then reconnect to restore. [msg 2] iPhone device timed out.
I've been dealing with this problem for a couple months and found that if I disconnect the printer (HP C4280) then connected either other device then everything works just fine.
I downloaded XCode 2.5 and launched the USB Prober utility. Then plugged in each device in turn and found some interesting findings.
When connecting the iPhone (1st attempt) the USB Logger reported; (iTunes displayed msg 1 from above)
128.517 [1] USB Device iPhone is violating Section 9.3.5 of the USB Specification -- Error in GetConfigDescriptor( wLength = 4)
128.520 [1] USB Low Power Notice: The device "iPhone" cannot be used because there is not enough power to configure it
128.528 [1] USB Low Power Notice: The device "iPhone" cannot be used because there is not enough power to configure it
128.629 [1] AppleIRController[0x2dc8e00]::RearmInterruptRead immediate error 0xe000404f queueing read, clearing stall and trying again(1)
When connecting the iPod (1st attempt) the USB Logger reported; (iTunes never showed that the iPod devices was connected)
938.797 [1] USB Device IOUSBDevice is violating Section 9.3.5 of the USB Specification -- Error in GetConfigDescriptor( wLength = 4)
938.801 [1] IOUSBCompositeDriver[0x39b9f80](IOUSBDevice) SetConfiguration (1) returned 0xe00002ed
938.900 [1] AppleIRController[0x2dc8e00]::RearmInterruptRead immediate error 0xe000404f queueing read, clearing stall and trying again(1)
When connecting the iPhone (2nd attempt) the USB Logger reported; (iTunes displayed msg 2 from above)
1789.023 [1] AppleIRController[0x2dc8e00]::RearmInterruptRead immediate error 0xe000404f queueing read, clearing stall and trying again(1)
1802.166 [1] AppleUSBEHCI[0x28a7000]::Found a transaction which hasn't moved in 5 seconds on bus 253, timing out!
1809.166 [1] AppleUSBEHCI[0x28a7000]::Found a transaction which hasn't moved in 5 seconds on bus 253, timing out!
I'm suspicious of the USB Low Power Notice. If this is true then I suspect the my iMac might need some type of repair. However I am also suspicious of USB Device violating the USB Spec Error. Although this is the message that appears when I plug in the iPhone or iPod I don't think I can assume that error relates to the iPod or iPhone. The error doesn't specify which USB Device is in violation.
My current workaround is to unplug the printer every time I sync the iPhone or iPod which is cumbersome. I'm also worried that repeated connecting/disconnecting of USB plug for the printer will over time damage the USB port.
I'm not sure what options I have here. Can anyone provide some suggestions or information that might provide some insight.
Best Regards,
xgnomex

A-Ha! Now I'm feeling like my 1.5 hours of reading this forum are not wasted, since I've found others with similar symptoms.
I've only had my iMac for two weeks today. I've got some new accessories & have experimented with the ones I've had awhile (various USB external drives). My model has 3 USB ports, one of which is taken by the keyboard, of course.
Over the weekend, I picked up an MS Office 2008 Upgrade and also an HP Officejet Pro L7680 all-in-one. I only mention the Office upgrade because I installed it on the same day as the printer, but it's possibly unrelated.
I actually have a Belkin 4-port hub--not the same one suggested in this thread, but externally powered with it's own A/C adapter. (It's a Hi-Speed USB 2.0 r-Port Hub, model F5U234 Rev.3, and I used it with a previous iMac G3 CRT with no problem.)
So with a LaCie 100 GB USB Mobile Drive in one of the iMac's ports, and the HP L7680 in the iMac's third port, or the HP via the Belkin hub in iMacs the third hub, here are some of the symptoms I've seen:
1) while browsing in Firefox, suddenly the mouse-cursor will "freeze" (get stuck) in a pull-down selector...sometimes it unfreezes, but eventually (like on the next pull-down menu) the keyboard & mouse will shut off (and if you wait & the iMac goes to sleep, the keyboard won't let me enter my unlock password when I wake the iMac with the Apple Remote)
2) when trying to open a document from the LaCie in MS Word, Word freezes and the keyboard & mouse go dead--terminal beachball--to restart the computer, I have to hold in the power button
3) when trying to print a message in Mail, Finder freezes (though the print job does finish)
These symptoms seem strange! Hey, it's just supposed to work, right? But everything has limits, so my question becomes, "how much stuff can I hook up at once?"
I wonder if this Apple article is addressing this issue:
http://docs.info.apple.com/article.html?artnum=25243
especially when it says "Two high-bandwidth devices or two isochronous devices cannot be connected to a single Universal Serial Bus (USB)."
So only two hi-speed USB devices can be connected "to the same bus" simultaneously? I'm not entirely sure I understand what "isochronous" means, but I'm thinking I need to peel my printer off the USB somehow, maybe via Airport Express--?
Does anyone know for sure about USB limitations? Thanks.
Also, xgnomex, how/where did you find that "USB Logger"? Is that something iPhone-specific, or is it an OS X log in a Library somewhere?

New Lexar USB card reader, X tells me low power

The card reader worked fine yesterday.
Today, no matter where I plug it in (usb port) or the keyboard, OS X pops up a window telling me there is low power for this device. Therefore, I can not mount the CF card in the Lexar card reader.
This card didn't have any installers. Should I look for some on their webpage?
I guess I should have bought the Sandisk card reader, about the same price, eh?
Should I start looking for my receipt to trade it for the Sandisk card reader?

Lexar USB card reader is: Model RW022 Rev A
I did contact Lexar using their 24 hour live chat on their webpage. An excerpt from the conversation is pasted below. I wrote "Lexar" and "me" to hide identities of those involved.
Lexar: we are sorry to say that, our card reader is compatible with USB 1.0, USB 2.0.
Lexar: not compatible with 1.0
me: so the card reader is not compatible with 1.0 on a Mac
Lexar: exactly.
Lexar: not compatible with USB 1.0
me: ok, thanx
Lexar: is there any thing else i need to assist you.
me: yes, what versions of Mac OS is this card reader compatibvle with?
Lexar: this reader RW022 is compatible with MAC tiger.
me: from your webpage this card reader is compatible with USB 1.1 and USB 2.0
me: http://www.lexar.com/readers/compactflash-2.html
me: All Macs, even older ones, were USB 1.1
Lexar: all lexar products are compatible with USB 1.1 and USB 2.0 only.
me: My mac is USB 1.1
Lexar: then it will work.
The conversation went on and Lexar asked for time to research this, which I told them to take all the time they needed.
In the end though, Lexar asked me if I had it connected to the keyboard, and I answered yes, and they said it should be connected to the tower.
So I'm assuming connecting the card reader to the Apple keyboard doesn't have enough power (as the keyboard and Pro Mouse are also using the power there). They told me it should work if connected to the tower. I thanked them and said I'd try that.
So I'm assuming that this card reader should either be connected to the Cube directly (without turning it over I hope I have 3 USB ports under there) or to a better USB port that is powered (than what I have) so that the card reader gets plenty of power. In the past, I simply connected my very old CF reader [in OS 9.x] to the keyboard (like I do my scanner) and it worked.
Do most card readers need to be connected to the "tower" or to a powered usb port?

Low power on USB port for external hard drive

Hi all!
I'm new here and I have some question about my brand new hybrid - HP Envy x2.
Couple days ago i found an issue that usb ports are powered by from motherboard even when tablet with dock is turned off or in hibernation mode. This is problematic when I leave device with plugged usb hub, external HD, speakers (powered from usb port) and mouse. After 8 hours in work when I go back home I saw that battery is about 10-15% lower than before leaving Envy x2. I disabled USB charge mode in BIOS, but after that I have problem with working of my external HD.
When I try to attach hard drive to computer and then I try to turn it on nothing happens - looks like system (Windows 8.1) can't boot. But after immediate unplugging HDD from USB system goes to procedure of starting. I also tried to plug Toshiba HD after turning on my Envy x2 and being in desktop, but nothing happens. Light on HD is blinking, I can hear from it sound like clicking (trying to start?). Also HD is visible in Device Manager but not in My Computer (as additional partition).
I have tried to change boot options in BIOS by positioning of devices (priority to boot from CD ROM, HDD, OS etc.) but did not fixed problem.
After couple of tests provided to found why my HD did not work properely in disabled USB charge mode I know that USB port did not give minimum value of power from supply. I found cable with one plug on one side, and with two plugs on other side (like "Y" type). Then i plugged one end into first USB port, then second end in second USB port and finally - last end of cable to m HD and booooom! It works!
Here is my question: Is there any ability to change that kind of power supply on USB ports? I want to power mu external hard drive from one USB port, not from two. I have USB hub but don't want to use two USB ports (on the opposite positions of docking station) and additional USB cable. I have the most recent BIOS (F12) and all fresh drivers installed on my computer.
Any solutions?

I am not going to take credit for this. I had a similar problem, but all of my USB ports stopped working for EVERYTHING! You were right on track, and here is the final bit of information that you needed: Microsoft Surface tablet External USB hard drives auto-sleep in Windows 8.1 Posted on November 4, 2013 After upgraded from Windows 8 to Windows 8.1 Pro, my SeaGate Expansion 2TB hard drive always runs to sleep mode automatically and then disappears if no file transfers occur. when I try to access its stored files, the File Explorer will be unresponsive. Changing the power options is not working. In Windows 8.1 the external USB hard drives and USB flash drives are configured with a low power state by default. That causes USB massstorage devices auto-sleep or file transfers stop unexpectedly. You could change the hardware ID of USB storage device in the registry to resolve the problem. * Updated to the latest firmware for the device to check if it is fine. * From Start screen, open the Search charm, type regedit, right-click the regedit icon from result, and select “Run as administrator“. * In the left pane of Registry Editor, navigate to the key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\usbstor * Right-click the “usbstor” and create a key with the following key name: apricorn (aegis padlock) 09840315 buffalo external hdd 500gb 04110105 cavalry dual bay dock 152d2352 diskgenie usb device 09840092 hitachi touro 3.0 4tb usb 3.0 49711015 kingston datatraveler hyperx 3.0 usb device 256gb (dthx30/256gb) 0951162b lacie 2tb usb drive 059f1018 mediasonic h82-su3s2 probox 152d0539 multi-drive enclosure connected 15200551 seagate expansion 2tb 0bc23320 seagate expansion desk 3tb 0bc23312 seagate fa goflex desk 2tb 0bc25071 verbatim store ‘n’ save superspeed 3tb 18a50400 western digital elements desktop 2tb 10581021 western digital my book 2to 10581140 * Now right-click the new key, create a DWORD entry named DeviceHackFlags with 400 hexadecimal value. * Make a reconnection for the device. RELATED POSTS How to Disable SkyDrive Integration in Windows 8.1 Install Windows 8.1 from USB flash drive Error Code 0xc1900104 Windows 8 gps receiver for Surface Pro Fix Stylus/Pen not working bug on Surface Pro Windows 8 app not sync with Google Apps calendar Create Windows 8.1 Bootable USB Flash Drive This entry was posted in Windows 8 and tagged issues, USB, Windows 8.1 by Windows 8 rt/pro. Bookmark the permalink.

3G IPOD SHUTS DOWN ON "LOW POWER" AFTER CONNECTING TO ITUNES 7.0.2.16

My 3G Ipod will shutdown after briefly connecting to Itunes Ver 7.0.2.16. The Ipod displays a message saying that it is out of power. However, the display shows a full power meter before connecting to Itunes. I reboot Ipod and start playing songs and the power meter slowly begins to display a full power meter. I believe the Ipod has plenty of Power -- it has been charging all day. I am able to transfer songs to the Ipod for a short period before the Ipod shows low charge and then automatically shutsdown.
HP Pavilion a250n - Intel Pentium 4 Windows XP Pro

I typically charge the Ipod with my Altec Lansing Musical Docking station or my automobile FM transmitter. So the Ipod is already powered up when I connect it to my PC via a USB cable. But it shuts down and displays a low power alarm before it shuts down. So I only use USB to update -- and this has worked fine for many years. When I try to use the firewire connection, my PC bombs (blue screen of death error).
Thanx for your comment.

HT4060 My ipad has been charging most of the morning but its still saying low power...what does that mean?

I've been charging my ipad most of the morning but its still saying low power...what does that mean?

iPad Charging
"The fastest way to charge your iPad is with the included USB Power Adapter.
iPad will also charge, although more slowly, when attached to a computer with a high-power USB port (many recent Mac computers) or with an iPhone Power Adapter.
When attached to a computer via a standard USB port (most PCs or older Mac computers) iPad will charge, but only when it's in sleep mode.
Make sure your computer is on while charging iPad via USB. If iPad is connected to a computer that’s turned off or is in sleep or standby mode, the iPad battery will continue to drain."

Webcam not entering low-power mode after resume

Can other W520 owners with a webcam (and potentially other models) confirm whether or not the camera prevents the USB subsystem from entering low power mode?
1) Unplug all USB peripherals, and turn off Bluetooth (this runs on USB as well)
2) Put the system into standby, unplug the AC adapter, and resume the system on battery.
3) Load a Command Prompt and run powercfg -energy
4) Load the generated report and look for the following:
The most noticeable issue caused by this is unnecessarily high power consumption, and as a result, lower battery life.
Turning the camera on and off (using the Fn=F6 preview window) turns this off and returns power consumption to normal.
On the latest available BIOS, chipset, and camera drivers.
Would like someone to confirm whether this is a driver issue or if it's just my system.
W520: i7-2720QM, Q2000M at 1080/688/1376, 21GB RAM, 500GB + 750GB HDD, FHD screen
X61T: L7500, 3GB RAM, 500GB HDD, XGA screen, Ultrabase
Y3P: 5Y70, 8GB RAM, 256GB SSD, QHD+ screen

I have a very similar spec also. The pair of U2410's (updated revision A01) connected to it won't go into sleep mode (just go black, with backlight still on).
The pair of cheapie BenQ 2420HD's I had connected while I waited for the Dells went into sleep mode fine.
Someone on another forum noted that they had a different model Dell on Mac with the same problem, and he found it only happened when the USB uplink cable was connected to the Mac. I disconnected mine (uplink and down), but no change unfortunately.
Google searching seems to suggest this is almost exclusively only with a Dell/Mac combo (same monitor on PC works fine and other brands on Mac work fine). These U2410 monitors get an absolute bagging on most forums, and I think most of it is deserved. These will both be going back for a refund with severe blue/pink tints making them visually perform worse than the BenQ's that were 1/3 the price. What's the point of spending 2 to 3 times the amount on IPS monitors when they're off colour even right in front of them!
The HP 24" IPS uses the same crap LG panel as these Dells, I can't justify 2 x 30" Apple Cinema displays for AU$5000, and one just won't cut it. No simple answer it seems....
Cheers
Dav

USB and power

I've been having problems connecting USB devices to my (Dual G5) Mac. How do the power outputs on the USB sockets differ? I've put in an internal Belkin 4-way USB card, but I get low power warnings if I plug my iPod into it. My Wacom tablet works ok on it, as do several other devices. I've also got a 7-way external USB hub connected via one of the Mac's rear sockets, which doesn't provide enough power for anything, I can only connect self-powered devices to it (the hub has it's own external power supply). Everything works ok from the front USB socket.
I presume the various sockets I've got connected derive different power, can anyone advise on the most efficient way to connect USB devices?
Cheers
Steve

Quote
In all new models?
Not necessarely.
Quote
in MSI mainboard like P35-Neo2 FR, does the usb power down or not when I shut down the pc? In Asus, Abit and Gigabyte mainboards, for example, usb remains always on.
This has nothing to do with manufacturers/brands but with the specific board model in question.
Are you looking for a board that supplies power to the USB ports when the system is shut down or for one that doesn't? Try to be more specific about your question that makes it easier to give you an answer.

USB HUB POWER EXCEEDED (with mid 2007 iMac keyboard)

When I connect any USB 2.0 device in the keyboard USB port, windows vista (XP too) shows the follow message:
"USB Hub power exceeded"
But when I use the same kind of USB hardware with MAC OS they just run fine, with no errors!
Is there any way to bypass or correct this error in Windows?

Here's the basic XP troubleshooting document (from Microsoft) for that one:
One or more USB devices may not work after you start your Windows XP-based computer
But I've also seen it produced when a high-power USB device is connected to a low power USB port.
Are the keyboard USB ports on the iMac low power or high power?

Low power warning for AIR-LAP1242AG-C-K9

Hi Buddie,
We purchased some AIR-LAP1242AG-C-K9 , but not perchasing any wireless controller. When I connect the LAP to Cat2950 or Cat2960 PPoE port, all the LAP can not boot normally. It indicates low power, please refer the two pictures attached. But if I use external power cable, the LAP can work well. So, I would like to know two things.
1. Can I use LAP standalone without using controller ?
2. If the above is Yes, how should I configure the PPoE on cat2950 to Support LAP correctly?
Thank you very much.

Hi Jian,
Q. Can an LAP operate independent of a wireless LAN controller (WLC)?
A. No, LAPs cannot function independent of WLCs. LAPs function in conjunction with a WLC only. The reason is that the WLC provides all the configuration parameters and firmware that the LAP needs in the registration process.
So you will need to either send the AP's back and get the IOS version, purchase a WLC or convert the LAP to IOS :(
Q. How do I distinguish between a regular (autonomous) AP and an LAP?
A. The easiest way to distinguish between a regular AP and a LAP is to look at the part number of the AP.
LAP (Lightweight AP Protocol [LWAPP])?Part numbers always begin with AIR-LAPXXXX.
Autonomous AP (Cisco IOS? Software)?Part numbers always begin with AIR-APXXXX.
From this good Q&A doc;
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_qanda_item09186a00806a4da3.shtml
You can convert an access point from lightweight mode back to autonomous mode by loading a Cisco IOS Release that supports autonomous mode (Cisco IOS release 12.3(7)JA or earlier). If the access point is associated to a controller, you can use the controller to load the Cisco IOS release. If the access point is not associated to a controller, you can load the Cisco IOS release using TFTP.
Using a TFTP Server to Return to a Previous Release
Follow these steps to revert from LWAPP mode to autonomous mode by loading a Cisco IOS release using a TFTP server:
Step 1 The static IP address of the PC on which your TFTP server software runs should be between 10.0.0.2 and 10.0.0.30.
Step 2 Make sure that the PC contains the access point image file (such as c1200-k9w7-tar.122-15.JA.tar for a 1200 series access point) in the TFTP server folder and that the TFTP server is activated.
Step 3 Rename the access point image file in the TFTP server folder to c1200-k9w7-tar.default for a 1200 series access point, c1130-k9w7-tar.default for an 1130 series access point, and c1240-k9w7-tar.default for a 1240 series access point.
Step 4 Connect the PC to the access point using a Category 5 (CAT5) Ethernet cable.
Step 5 Disconnect power from the access point.
Step 6 Press and hold MODE while you reconnect power to the access point.
Step 7 Hold the MODE button until the status LED turns red (approximately 20 to 30 seconds) and then release.
Step 8 Wait until the access point reboots, as indicated by all LEDs turning green followed by the Status LED blinking green.
Step 9 After the access point reboots, reconfigure it using the GUI or the CLI.
From this doc;
http://www.cisco.com/en/US/products/hw/wireless/ps430/prod_technical_reference09186a00804fc3dc.html#wp161272
Hope this helps!
Rob

USB Low power?

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