Tim Jackson writes:
I'm unfortunately no expert in this area, but as far as I can tell, certain(?) chipsets using the nouveau driver fail to resume from suspend on all 5.12 kernels, which leaves the system in an apparently unrecoverable state requiring a hard reboot. The same hardware configuration has worked perfectly for me for several years through a number of Fedora releases.
Suspend on my laptop with nouveau hasn't worked in at least ten years (ever since I had it), much longer before kernel 5.12.
Interestingly enough, on this laptop and laptop alone I'm offered a "Hybrid Sleep" alternative which works fairly reliably. It does, occasionally, fail to wake up, getting stuck in a weird "try to wake up, go back to sleep" infinite loop that only a hard power reset can cure. But it hasn't done that in a long while, maybe someone found this bug and fixed it. Keeping my fingers crossed.
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