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Help getting Ubuntu with KDE to sleep
(lemm.ee)
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this post was submitted on 06 Mar 2024
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I don't know about KDE in particular, but I've had problems with USB mice waking various Ubuntu systems when they're not directly connected (i.e. there's a hub or KVM in between it and the computer). The workaround I used for that was to remove the mouse input (e.g. by carefully pressing a physical button on the KVM) -- which was good enough for me -- but I think there is a programmatic way to block particular classes of input from waking the system if some device is waking your system inappropriately.
Doing a quick search turned up this: https://askubuntu.com/questions/252743/how-do-i-prevent-mouse-movement-from-waking-up-a-suspended-computer -- I can't vouch for any of the specific techniques there though.
Worth noting that while I had a problem with the mouse specifically, other hardware could be causing your system to wake up.
Soooooooooo... thank you so much. I finally had time for trying out solutions here and your link to askubuntu helped me solve this. Specifically, the answer from Ali Hoza is what I tried first and it seems to work very well. I am copying that answer here for anyone else at Lemmy to try.
The above solution (https://askubuntu.com/a/265389/1467620) works, but it is crude and, also it disables the keyboard wake, which is actually useful.
A more granular alternative can be this: First, we start by enumerating the USB devices connected to the system:
from here, it’s pretty obvious which one is the mouse:
then we proceed with finding where the devices are mapped to:
Finally, to figure out which is which, we use:
at which point it’s pretty obvious which one needs to be disabled:
note: every time you need to echo as superuser, sh -c is necessary, or the system will not allow redirecting to a priviliged file.
Then it’s just a matter of suspending the system and verifying that, while the mouse does not wake it, the keyboard will.
this does not survive a system reboot, so either you need to re-run the last command, or add it to your .bashrc or .zshrc.
This is something that has been annoying me on Ubuntu since when I installed 16.04, and probably there forever, I cannot understand why Canonical wouldn’t add this in the System Settings.
Source: https://codetrips.com/2020/03/18/ubuntu-disable-mouse-wake-from-suspend/