Exactly. I did the "verification-done-bionic" step for 18.2.2 in comment #12 above; and unfortunately I don't have an affected school nearby, where I could test 18.2.8 in cosmic, and installing cosmic in a remote school would be hard.
Thanks a lot Timo! -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 Committed Status in linux source package in Cosmic: New Status in mesa source package in Cosmic: Fix Committed 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 : 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/~kernel-packages Post to : email@example.com Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp