Hi, On 2/9/21 12:27 AM, Chris Wilson wrote: > Quoting Hans de Goede (2021-02-08 20:38:58) >> 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: > > I tried to reproduce this on the w/e on hsw-gt1, to no avail; and piglit > did not report any differences with and without mitigations. I have yet > to test other platforms. So I don't yet have an alternative. Note the original / first reporter of: https://bugzilla.redhat.com/show_bug.cgi?id=1925346 Is using hsw-gt2, so it seems that the problem is not just the enabling of the mitigations on ivy-bridge / bay-trail but that there actually is a regression on devices where the WA worked fine before... If you have access to a hsw-gt2 device then testing there might help? Also note that this reproduces more easily on 5.10.10, which does not have: 520d05a77b2866eb ("drm/i915/gt: Clear CACHE_MODE prior to clearing residuals") Not sure if that helps though. > Though note > that v5.11 and v5.12 will behave similarly, so we need to urgently find > a fix for Linus's tree anyway. Ack. Regards, Hans
