Hi, On 2/25/21 1:33 PM, Justin Forbes wrote: > On Thu, Feb 25, 2021 at 5:44 AM Hans de Goede <hdegoede@xxxxxxxxxx> wrote: >> >> 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. >> > The actual patch was not attached, It was attached to the first email in this thread, I've also attached it to this email again. > so I could not add it, you are > welcome to do so, or attach the patch and I will do it. If you can take care of this, then that would be great, thanks. Please also link bug 1925346 in the bodhi-update for the kernel where this lands, I've dupped all the others to that bug. > Note 5.10 > kernels are managed in dist-git right now and follow the regular > process. 5.11 kernels are in the kernel-ark tree in the fedora-5.11 > branch, I can handle an MR against this. I know, I plan to submit my first 5.11 MR for the platform-profile backport discussed in another thread soonish. >> 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. Unfortunately only the first commit made it into Linus tree ATM, so carrying these 3 downstream for now would be good. I've pinged Chris Wilson about getting the other 2 send out in a fixes pull-req for 5.12 . 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
