i915 flickering with 5.12.X kernels
I noticed that when I compiled 5.12 and 5.12.1 kernels my display started to flicker maybe in once a second.
With kernel 5.11.16 or below that there is no flickering. I'm using Gentoo testing and all other packages remained the same when I switched between 5.11.16 and 5.12.X.
Here is a video to demonstrate the problem with kernel version 5.12.1.
Here is the full dmesg from the boot when the problem occurs. drm.debug=14 and log_buf_len=4M kernel parameters were used. dmesg.log
I have noticed that people were having these kinds of issues a couple of years ago with pstates and/or psr. Maybe this bug in the latest kernel is also related to them?
Hardware: Lenovo Thinkpad X1 Carbon, gen 2 Latest BIOS 1.40 Intel(R) Core(TM) i7-4550U CPU with Intel HD Graphics 5000 14.0" WQHD (2560x1440), 300nit, IPS
Best Regards, -Risto