This bug was fixed in the package mesa - 19.0.8-0ubuntu0~18.04.2
---------------
mesa (19.0.8-0ubuntu0~18.04.2) bionic; urgency=medium
* i965-revert-enabling-softpin.diff: Dropped, unnecessary by now and
broke Ice Lake which needs softpin. (LP: #1815172)
* rules: Force -DNDEBUG, meson < 0.47 is buggy and doesn't set it even
if we have b_ndebug=true. (LP: #1841412)
-- Timo Aaltonen <tjaal...@debian.org> Tue, 27 Aug 2019 09:42:44 +0300
** Changed in: mesa (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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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:
Fix Released
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)
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