ASUS Zenbook UX391
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Fixing screen glitches
By default screen glitches will appear at some point, but the system is fully usable nevertheless. To fix this add intel_idle.max_cstate=4
to your boot options.
For GRUB you can edit /etc/default/grub
, add intel_idle.max_cstate=4
to GRUB_CMDLINE_LINUX_DEFAULT
and update grub with the new config.