There have also been reported some issues with the i915 mitigation stuff in bug 1925346
Testing has shown that to fully fix the issues with the new i915 mitigation stuff on Haswell the following commits are necessary on top of 5.11 :
e627d5923cae ("drm/i915/gt: One more flush for Baytrail clear residuals")
d30bbd62b1bf ("drm/i915/gt: Flush before changing register state")
1914911f4aa0 ("drm/i915/gt: Correct surface base address for renderclear")
There have also been reported some issues with the i915 mitigation stuff in bug 1925346
Testing has shown that to fully fix the issues with the new i915 mitigation stuff on Haswell the following commits are necessary on top of 5.11 :
e627d5923cae ("drm/i915/gt: One more flush for Baytrail clear residuals")
d30bbd62b1bf ("drm/i915/gt: Flush before changing register state")
1914911f4aa0 ("drm/i915/gt: Correct surface base address for renderclear")