Hi All,
We (Fedora) have been receiving reports from multiple users about gfx issues / glitches stating with 5.10.9. All reporters are users of Ivy Bridge / Haswell iGPUs and all reporters report that adding i915.mitigations=off to the cmdline fixes things, see:
https://bugzilla.redhat.com/show_bug.cgi?id=1925346
Which should be fully visible without a bugzilla account.
I noticed that 5.10.13 had one more related i915 patch, so I've asked the reporters to retest with 5.10.13, 5.10.13 is better, but things are not fixed there, it just takes longer for the problems to show up.
Greg, I can prepare a Fedora test-kernel build for the reporters to test with the following 3 commits reverted:
520d05a77b2866eb ("drm/i915/gt: Clear CACHE_MODE prior to clearing residuals") ecca0c675bdecebd ("drm/i915/gt: Restore clear-residual mitigations for Ivybridge, Baytrail") 48b8c6689efa7cd6 ("drm/i915/gt: Limit VFE threads based on GT") (Note this are the 5.10.y hashes)
Reverting these 3 is not ideal, but it is probably the fastest way to get this resolved for the 5.10.y series.
Greg, do you want me to have the reporters test a 5.10.y series kernel with these 3 reverts ?
Regards,
Hans