Quoting Hans de Goede (2021-02-09 11:46:46) > 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... There have been 3 crashes uploaded related to v5.10.9, and in all 3 cases the ACTHD has been in the first page. This strongly suggests that the w/a is scribbling over address 0. And there's then a very good chance that commit 29d35b73ead4e41aa0d1a954c9bfbdce659ec5d6 Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Date: Mon Jan 25 12:50:33 2021 +0000 drm/i915/gt: Always try to reserve GGTT address 0x0 commit 489140b5ba2e7cc4b853c29e0591895ddb462a82 upstream. in v5.10.14 is sufficient to hide the issue. -Chris
