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My Ubuntu 20.0 uses kernel 5.15.0-86-generic x86_64. When I put nomodeset in the grub boot menu this does not happen.

My PC uses AMD Radeon video drivers.

Ubuntu 20.04 screen artifacts during login:

The screen has this glitch

karel
  • 114,770
ALAN CERVANTES GUZMAN
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  • I have the same problem, I have a laptop with Ubuntu 20.04 with (I think) AMD graphics which works fine when booting 5.15.0-84-generic kernel but screen goes blank/flickery just before/after logging in on 5.15.0-86-generic kernel.

    FWIW I found some bug reports of others who also have the same problem here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2039378 and here: https://forums.linuxmint.com/viewtopic.php?t=405762

    But I haven't found any analysis/fix of what causes the problem yet.

     – nichtNox Oct 16 '23 at 22:51

1 Answers1

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Apparently, this happens only when my Ubuntu uses the kernel 5.15.0-86-generic x86_64. I changed it to kernel 5.15.0-84-generic x86_64 and the issue was gone.

ALAN CERVANTES GUZMAN
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  • This is a useful workaround but not a longterm fix, since I don't want to be stuck on an old kernel version forever. – nichtNox Oct 16 '23 at 22:53
  • People on this thread: https://forums.linuxmint.com/viewtopic.php?t=405762 have reported that kernel 6.2 solves this issue for them, though I'm not sure how to get kernel 6.2 on ubuntu 20.04 - will look into that. – nichtNox Nov 08 '23 at 12:15
  • For anyone else in same situation: I upgraded to ubuntu 22.04, then switched to HWE kernel upgrades using the instructions here, including the cleanup instructions in the comment. Worked for me. – nichtNox Nov 29 '23 at 00:15