I did the following changes and am now flicker-free for two days:
In file /etc/default/grub I added to parameter GRUB_CMDLINE_LINUX_DEFAULT:
i915.enable_dc=0
intel_idle.max_cstate=2
then:
sudo update-grub
reboot
My laptop is now usable but it cant be a permanent solution to disable
energy saving
Likely similar to:
https://bugs.launchpad.net/ubuntu/+bug/1970426
https://gitlab.freedesktop.org/drm/intel/-/issues/5569
https://gitlab.freedesktop.org/drm/intel/-/issues/5238
** Bug watch added: gitlab.freedesktop.org/drm/intel/-/issues #5569
https://gitlab.freedesktop.org/drm/intel/-/issues/5
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