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I use a nuc7 (NUC Kit NUC7CJYH) with a TV via hdmi. Prior to 5.9.x kernels, there would be no issue with graphics wakeup after either powering the TV off, or dpms monitor sleep.
With the 5.9 kernels, after powering down the TV for a while, or after a dpms sleep and TV power cycle, the display does not wake up at all (no signal). The nuc is still accessible via ssh. I also observe that when I reboot from this state, the shutdown takes a several minutes, apparently waiting for a process that will not terminate. This is fully repeatable.
$ xset 10 # for testing purposes; same occurs with normal 600s timeout
# display times out in 10 sec.
# power off TV
# power back on
# keyboard or mouse will not bring display back
I've downgraded to a 5.8 kernel, and this problem does not occur.
I see no unusual messages on dmesg. Is there somewhere else I can look for logs / messages to help with the troubleshooting? Right now using 5.8 kernels is a workable solution, but I obviously want to move back to a current kernel. Thank you.
Last edited by mervinb (2022-08-20 01:07:02)
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Did you mean "xset dpms 10"?
I have a similar problem with a Thinkpad laptop, but my monitor does wake up from DPMS standby, it however doesn't wake up on wakeup after a system suspend, I have to disable and enable it via xrandr to wake it up.
It could be that some driver has changed, or the kernels were compiled with different options.
Of the two of those, comparing the different options is the easiest, you can do this:
boot with kernel 5.8
zcat /proc/config.gz > /var/tmp/options-5.8boot with kernel 5.9
zcat /proc/config.gz > /var/tmp/options-5.9diff -u /var/tmp/options-5.8 /var/tmp/options-5.8Then take a look at that diff for anything suspicious.
Of course, being different versions the options will be different, but try to find anything related.
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I did a full re-install, and the issue resolved.
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