This bug was fixed in the package mesa - 18.2.8-0ubuntu0~18.10.2
---------------
mesa (18.2.8-0ubuntu0~18.10.2) cosmic; urgency=medium
* i965-revert-enabling-softpin.diff: Don't enable softpin, causes
issues on 32bit installs. (LP: #1815172)
mesa (18.2.8-0ubuntu0~18.10.1) cosmic; urgency=medium
* New upstream bugfix release. (LP: #1811225)
- add missing gpu-id's. (LP: #1789924)
* Cherry-picked from disco:
Move KHR/khrplatform.h from libegl1-mesa-dev to mesa-common-dev
because GL/glcorearb.h and GL/glext.h started to depend on this
header too (Closes: #914167).
-- Timo Aaltonen <tjaal...@debian.org> Fri, 08 Feb 2019 19:12:58 +0200
** Changed in: mesa (Ubuntu Cosmic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1815172
Title:
Black screen on skylake after 18.0 => 18.2 update
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:
New
Status in mesa source package in Bionic:
Fix Released
Status in linux source package in Cosmic:
New
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)
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