Alkis, could you double-check if your setup is fine now with the current 4.15 kernel and mesa from proposed? Mine is, but I'd rather not rely on that test alone.
-- 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: Fix Committed 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 : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
