05-15-2018 04:56 PM
I have a Thinkpad P50 on which I am dual booting Ubuntu 16.04 and Windows 10. Forer over a year I had no problems with USB devices or anything else. A couple of weeks ago, my Apple generic USB keyboard began to intermittently fail on boot. It didn't work at thed GRUB bootloader menu, and also did not work in either OS after completing the boot and login process. I'm so lucky that the laptop's internal keyboard continues to work, if this happened on a desktop I'd be sunk. Anyway, it stopped working completely the last couple of days; it's not intermittently working any more. There were BIOS upgrades and OS updates in both OSes around the time it started happening, so, unfortunately, I can't tell which of them might have caused it. Here are my observations:
1. External USB keyboard does not function at the GRUB menu and also does not function in either OS.
2. The keyboard (an Apple wired extended keyboard) works perfectly with my wife's Dell laptop running Windows 10, and also with my Macbook Pro. I wish I had a different USB keyboard to test, but I don't.
3. Other USB devices, including an external USB wireless mouse, work perfectly, even at the GRUB menu.
4. I have not changed BIOS settings (well I tried some, but I set them back). I certainly did not change any when it originally stopped working.
5.. I believe I am running the latest BIOS: BIOS Version/Date LENOVO N1EET77W (1.50 ), 3/28/2018
I would appreciate any help or ideas anyone can provide for diagnosing and fixing this issue. Thanks.
05-16-2018 02:38 AM
Keyboard are typically handled as generic input devices that do not require a device driver for use, and I cannot think of a reason one would not work. Have you tried plugging it into different USB ports? If it still does not work, I would suggest obtaining another external USB keyboard (any generic model for PCs should do--I'd specifically suggest avodiing the Apple one for now) and seeing what difference that makes, if any.
05-16-2018 09:37 AM
Thank you very much for this reply. You answered one of my questions by saying that usually a device driver is not required for keyboards. Following your suggestion I swung by Walmart this morning and picked up a Logitech wireless USB keyboard. **bleep**! It works! So, it dawns on me <forehead slap> that the Apple keyboard is bus powered, but the Logitech keyboard, and my mouse, and other USB devices, have batteries. I'm now thinking that something is going on with my USB ports' bus power. Any ideas? I am happy to have a working external keyboard now, but it would be nice for bus powered devices to work, too. Thanks.
05-16-2018 12:48 PM
It may be that your apple keyboard needs some time to power up. Try plugging it into the always-on USB port (on the back, toward the left side)
05-16-2018 06:41 PM
Thanks for your response. I have tested the Apple keyboard in all four of the USB ports including leaving it in the always on port overnight. It does not work in any of them. It does work in my wife's Dell laptop, and also in my Macbook Pro. The only other bus-powered device I have is a bus-powered USB external hard drive. That seems to work fine. I'm kind of stuck on where to go from here. Thanks.
05-18-2018 03:02 AM
The only thing that immediately comes to mind is to check and make sure that the Apple keyboard's USB cable is fitting snugly into the ThinkPad's USB ports.
05-18-2018 05:21 AM
01-31-2019 04:37 PM