I've tried around a bit and found out that now, the problem occurred
also in 16.04. Not sure if I just didn't try enough before or if the
problems really wasn't there in 16.04 two months ago.
However, I've got the problem solved now. I updated the BIOS and the firmware
using Lenovo system update
Thanks for the suggestion. I just tried kernel 4.4.157. The problem
exists with this kernel as well.
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https://bugs.launchpad.net/bugs/1787782
Title:
Hanging keys on Thinkpad
To manage
I didn't have access to internet for a while. Now I checked it with the
upstream kernel v4.18.6. The bug still exists.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Public bug reported:
Under Ubuntu 18.04 the keys of my Thinkpad E480 are hanging very often.
Then, instead of pressed once, the key seems to be not released and
pressed continuously until another key is pressed. I have described the
behavior in more detail under https://askubuntu.com/questions/105
