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, so I could not add it, you are welcome to do so, or attach the patch and I will do it. 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. Justin > 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 _______________________________________________ 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
