** Changed in: mesa (Ubuntu Bionic)
Status: Fix Committed => In Progress
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1815172
Title:
[bionic] drm/i915: softpin broken, needs to be fixed for 32bit mesa
Status in Mesa:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in mesa package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Committed
Status in mesa source package in Bionic:
In Progress
Status in linux source package in Cosmic:
Won't Fix
Status in mesa source package in Cosmic:
Fix Released
Bug description:
[Impact]
Several schools reported black screens after normally updating their Ubuntu
boxes from 18.0.5-0ubuntu0~18.04.1 to 18.2.2-0ubuntu1~18.04.1.
Downgrading mesa fixes the problem.
lspci: 00:02.0 VGA compatible controller [0300]: Intel Corporation HD
Graphics 530 [8086:1912] (rev 06) Subsystem: ASUSTeK Computer
Inc. HD Graphics 530 [1043:8694] Kernel modules: i915
Unfortunately I can't find a lot of useful information, here are some bits:
* systemctl --failed says "gpu-manager" and "lightdm" have failed
* Xorg.log is clean: https://termbin.com/6l2b
* dmesg too: https://termbin.com/ip4e
* It happens on lightdm/MATE, I don't know about Ubuntu GNOME.
* If one runs `xinit` from ssh, it fails with:
i965: Failed to submit batchbuffer: Invalid argument
This is caused by mesa assuming that soft-pinning on GEN8+ is working
since kernel 4.5, but in fact this issue wasn't fixed until 4.19.3. So
a proper fix would be to backport commits from 4.19.3/4.20 to fix GTT
sizes/pin flags, but that's left for future.
[Test case]
install fixed mesa or kernel, check that the regression is fixed
[Regression potential]
mesa: shouldn't be any, it just reverts the change to always soft-pin
(TODO kernel: adds commits from upstream stable, which have been well tested
upstream by now)
To manage notifications about this bug go to:
https://bugs.launchpad.net/mesa/+bug/1815172/+subscriptions
--
Mailing list: https://launchpad.net/~desktop-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~desktop-packages
More help : https://help.launchpad.net/ListHelp
