Random flickering with Intel i915 (Gen9 GPUs) on Linux 6.8
Gen9 GPUs suffer from random flickering since Kernel 6.8. Last know good kernel is 6.6.
The flickering seems to be happening mostly when mouse cursor is in the lower 1/3 of the screen. Intensity, duration and frequency of appearance seems to be dependent on H/W variation and CPU/GPU load.
For some "intel_idle.max_cstate=4" seems to help, for some addition of "i915.enable_dc=0" is required and for others nothing helps.
With kernel 6.8.7 flickering got somewhat better (at least on my Skylake GT2 [HD Graphics 520]) but it is still very annoying.
Both Mainline and Ubuntu kernels are affected.
More information can be found here: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2062951