I had installed Xubuntu 18.04, 20.04 and 22.04 plus a few others and none of them would wake from suspend.
I could touch the mouse or keyboard and everything lit up like it was waking but, the monitor would indicate no signal, the monitor would return to sleep mode every time.
It took a reboot to get it back and that was a pain. That is until I finally found the solution here.
Now it suspends and wakes up normally like you'd expect it to.
Just thought I'd mention this as this has been bugging me for awhile and I just never had the time to look into it.
Cheers
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