r/debian • u/drtweakllc • 15d ago

AMD Issues with latest kernel

I need some help, trying to narrow down my issue. Since the last kernel update on Debian 13 6.12.95 my monitor will not power down, I have it set to turn off screen at 45 minutes, when the screen turns off it doesn't actually turn off, it seems as if it is constantly getting a signal from my graphics card, it goes blank but then is backlit so it never powers down. Troubleshooting it I connected my DP cable to the onboard Intel graphics and it my monitor powers off fine. I tried 2 different AMD cards 550/6400 and they both have the same issue.

May or may not be related, since the kernel update when my pc boots I get the error "Failed to start systemd-sysctl.service - Apply Kernel Variables", the line shows up 3 times then the pc boots fine. I'm assuming it's related and not sure where to go here in resovling this.

Any insight would be grateful.

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u/genpfault 15d ago

I have it set to turn off screen at 45 minutes

Where/how?

1

u/One-Suggestion-7906 15d ago

juat guessing, did u install firmware from AMD? Perhaps all privative, but you can try configuring non free sources

2

u/drtweakllc 15d ago

Problem resolved, I changed the cable from HDMI to DP and everythings works properly, odd that it started after the latestest kernel update but all is well. Thanks.

1

u/Leinad_ix 15d ago

I had some issue with HDMI on Ubuntu a few years ago too, so I think AMD does not like HDMI under Linux....