At first this looks like a hardware fault to me. It looks like what
happens when I replace a laptop screen and it doesn't get a clean
electrical connection. The same can happen if it has received some bumps
and intermittently loses connections on some pins.
However there's a chance this is a kernel bug and your observation that
20.04.2 does not have a problem supports that theory...
Please:
1. Edit /etc/default/grub and change:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_psr=0"
2. Run: sudo update-grub
3. Reboot.
Does that fix the problem?
** Package changed: xorg (Ubuntu) => linux-hwe-5.11 (Ubuntu)
** Changed in: linux-hwe-5.11 (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1950355
Title:
Intense screen flickering, vertical rainbow bars, display problems on
Ubuntu 20.04, Lenovo X1 Carbon
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