Hi, On 2/23/21 6:25 PM, Hans de Goede wrote: > Hi, > > I've been working with various reporters to try and get the sometimes severe > gfx glitches which people are seeing with kernel >= 5.10.9 resolved, see the > following bugs: > > 1843274 - i915 GPU Hang with kernel 5.7 on Haswell (Acer C720P Chromebook) > 1925346 - Screen glitches after updating to Kernel 5.10.10 > 1925903 - Flickering UI elements, screen instability (Wayland) > 1931065 - Frequent i915 hangs > > I've written 2 patches 2 address this and asked users to test Fedora-kernel > scratch-builds with those patches added. > > The first patch is i915-revert.patch, this reverts 3 troublesome commits > which were first added in 5.10.9 these commit change the i915 mitigations > for a year old i915 CVE which IIRC was mostly about data leaking from a > previous GPU context to the next. These patches enable these mitigations > on more GPU models, where they were previously disabled because they were > causing issues... > > Reporters have reported a 100% success-rate in getting rid of the gfx > issues with these 3 reverts. > > The second patch is i915-fixes.patch, this cherry-picks 3 patches from > -next instead (these were suggested by i915 upstream) and this also helps > for most users, but some users still report some rendering artifacts > (but overall things are much better). > > Upstream has gone silent on the issue of there still being rendering > artifacts with the 3 cherry-picked fixes unfortunately. > > Given that we are getting more and more bug-reports about this I think > that we should be do something about this downstream. Upstream seams > to be aiming for fixing things, rather then reverting, so going with > i915-fixes.patch will stay the closest to what I expect to land in > 5.10.y and 5.11.y at some point. The bug reports for this keep coming in; and it seems that this is fully resolved for all reporters except one by the i915-fixes.patch which I attached earlier; and for the one reporter who is still seeing some rendering glitches things are much improved, so I think he is also hitting a different issue. Here is the full lists of bugs which I'm aware of which all have this as root cause: 1843274 - i915 GPU Hang with kernel 5.7 on Haswell (Acer C720P Chromebook) 1922511 - Recent upgrades caused smearing/tearing 1925346 - Screen glitches after updating to Kernel 5.10.10 1925903 - Flickering UI elements, screen instability (Wayland) 1931065 - Frequent i915 hangs https://gitlab.freedesktop.org/drm/intel/-/issues/3099 So unless there are any objections I would really like to move forward with adding i915-fixes.patch to the Fedora 5.10.y kernels. Note I'm also working on getting the 3 -next commits: 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") which are in i915-fixes.patch added to Greg's stable kernels. Regards, Hans _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
