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@chris-wilson.co.uk 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