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Debugging/fixing no sound and no Fn keys after deep suspend on Ubuntu 21.10

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vjk

I have Asus Zenbook UX325EA with Ubuntu 21.10 installed on it with kernel version 5.13.0-21-generic.

By default the sleep mode in the system was set to s2idle:

Aldea# cat /sys/power/mem_sleep            
[s2idle] deep

Since this discharges the battery quite fast when suspended, I have changed it to deep by doing this:

Aldea# echo 'deep' > /sys/power/mem_sleep
Aldea# cat /sys/power/mem_sleep
s2idle [deep]

However, after doing this and suspending the laptop, the sound and the Fn button are not working anymore. Rebooting fixes the problem. Also the problem doesn't exist if I leave the suspend mode to s2idle.

How do I fix or start debugging this?

This looks like a similar problem to this previous question, which was unanswered: Fn keys and sound not working after resume from deep suspend - ubuntu 20.04.2 LTS

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