bionic was already fixed earlier by 18.2.2-0ubuntu1~18.04.2 in time for 18.04.2 release
cosmic got the exact same oneliner in 18.2.8-0ubuntu0~blah, and then that was backported to bionic which reopened this bug. Requiring Alkis to test this on cosmic is too much IMO, as it would involve first to set up a school to use cosmic, then test remotely or ask folks over there to report back... all for a oneliner. Alkis, please correct me if I'm wrong.. ** Description changed: - 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. + [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: + * 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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1815172 Title: Black screen on skylake after 18.0 => 18.2 update To manage notifications about this bug go to: https://bugs.launchpad.net/mesa/+bug/1815172/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
