After switching to 21.05, keyboard stops working after sleep

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1

I’m running NixOS on an semi-old Xiaomi Air laptop (specs here), but after upgrading to 21.05 my keyboard stops working after sleep.

If I boot on my last 20.09 configuration it’s fine - the keyboard works after sleep again. So I don’t think it’s a hardware issue.

I have to hard reset the computer and start it up again, each time I’ve put it to sleep.

I’ve googled this quite a bit and tried different variations of kernel parameters with 21.05, but the issue remains.

From my current configuration.nix:

# boot.kernelParams = [ "i8042.dumbkbd=1" "atkbd.reset=1" "i8042.nomux=1" "i8042.reset=1" "i8042.nopnp=1" ];
boot.kernelParams = [ "i8042.dumbkbd=1" "i8042.reset=1" "i8042.direct=1" ];

Any ideas?

2

Maybe this hack from Vaio laptops will work:

3

As it happens, those exact lines were already in my configuration.nix. Interesting.

I’ll try to remove them instead, and disable powerTop as well.

4

if that doesn’t work, find out what kernel you 20.09 was running, and perhaps rebuild with an older kernel. Nixos uses cutting edge/bleeding edge kernels… nixos with it’s roll back features can give you the ablity to try out new/custom/old kernels without fear of disaster.

as @grahamc coined ‘fearless tinkering’.

5

I was suspecting that something in userland was the issue - but going back to kernel 5.4 seems to have fixed the issue! I’ve included the resumeCommands line in my config as well before rebuilding with 5.4

I’ll try a version somewhere in between 5.4 and the latest.