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This morning when I brought Ubuntu our of sleep/suspension mode, the keyboard didn't work. This is a ThinkPad Yoga 15. The mouse pad works. If I plug a USB keyboard in, it works. I've tried the solutions posted here:

How to restore xserver? Updated from 16.04 to 16.10; the keyboard and mouse no longer works after getting to the lock screen

Which consists of:

Getting rid of NVIDIA drivers sudo apt-get remove --purge nvidia-*

Reinstalling the desktop sudo apt-get install --reinstall xserver-xorg

And I also tried reinstalling Ubuntu drivers apt install xserver-xorg-input-all and sudo ubuntu-drivers autoinstall

Are there any other tricks out there??? How can I solve this silly issue? I've had it before but the above tricks worked.

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I'm not sure this is an actual answer, but I got the keyboard working again. I read another post where a ThinkPad user had to unplug his battery to get the keyboard working again. He thought it was something to do with his BIOS.

As an experiment, I just unplugged my ThinkPad and let the battery run down. Ubuntu shut itself down, and wouldn't reboot because the battery was critically low. I let the system sit for a little while then plugged it in and booted. At that point the mouse pointer didn't appear, nor did the keyboard work, but the touch screen did work. I rebooted again and now everything is back to normal. Odd...

I wonder how it will behave after the next reboot.

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