My Kubuntu updated from kernel 5.4.0-42 to kernel 5.4.0-47 and my laptop's keyboard stops working (except brightness keys). Booting back to 5.4.0-42 solved the problem.
Keyboard also works perfectly on Windows 10 (I have dual boot).
Keyboard also works in GRUB (2.04). But it does not in kernels 5.4.0-47 and above.
Updating to Kubuntu 20.10 (beta) does not help either (kernel 5.8.0-20 same problem).
My problem is similar to this one: Keyboard on HP notebook stops working under kernel 5.4.0-45-generic
And yes, I've seen this on launchpad: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1894017
So what's the problem and why is it not fixed in whole range of kernels 5.4.0-47 – 5.8.0-20?
Best Answer
The solution was found here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1894017
I just blacklisted
intel_vbtn
kernel module in/etc/modprobe.d/blacklist.conf
and rebooted. Author mentioned that somehowintel_vbtn
thinks my laptop is in tablet mode (WHAT?!) and disabled keyboard/touchpad.How to blacklist
To implement this, you can either create a new file in
/etc/modprobe.d
with the suffix.conf
or use the mainblacklist.conf
file. The former may be preferable, since you can then just delete the file when it is no longer required (i.e. when the bug is fixed):Add a line to the file, optionally with a comment explaining why you are doing this
Save the file, exit and reboot.
P.S. After mailing with Mr. Hans de Goede from RedHat I got following answer:
P.P.S. On my system (Intel Celeron N2940)
chassis_type
returns10