Comment # 5 on bug 1161843 from S�bastien POHER

Thank you for your answer. Just upgraded to the latest kernel stable as well as
firmwares:

- kernel: 5.4.14-1.1.gfc4ea7a
- kernel-firmware-i915: 20200114-35.1

A few minutes after login in, the issue happended again with the same message
in 'dmesg' output.
When I woke up the laptop from sleep, the colors of GDM were still messed up
but they went back to normal instantaneously.
I can not find a pattern in things that I am doing when the flickers happend,
this time I was browsing a simple web page, this morning I was using Vim in a
terminal emulator (the issue blocked the computer, I had to close the lid to
put it to sleep and the screen was back to normal when it woke up).

If relevant, the default refresh rate of the screen is 60.03 Hz. Available
rates are 59.96 Hz and 48.03 Hz.

Is there any other information about hardware or settings that I may provide to
help sorting this out ?

I have seen on the Web that this kind of issue with the same output as already
happened in previous kernel releases. Some threads provide boot option to pass,
so far I have tried:

intel_idle.max_cstate=4

without success (https://bugs.freedesktop.org/show_bug.cgi?id=103229#c20).