I did some more experimentation. I did not get any system freezes when I shifted down to kernel 4.8 from 4.10, where I got a lot of freezes. In kernel 4.8 I get the same output when I run sudo systemctl status gpu-manager.service as I reported for kernel 4.10 above. This might indicate that this output isn't pointing to a system-crashing bug, but I'm not certain. In 4.8, the game periodically freezes but after a few seconds the screen flashes and suddenly it unfreezes. My guess is that the same bug that causes the freezing occurs in 4.8 but the system has some code that unfreezes the computer.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to ubuntu-drivers-common in Ubuntu. https://bugs.launchpad.net/bugs/1655348 Title: gpu-manager Error: can't open /lib/modules/ Status in ubuntu-drivers-common package in Ubuntu: New Bug description: At least once a day there is an unexpected desktop freeze incl. mouse and keyboard. Even magic-sys-rq isn't possible, only hard switch-off. From smartmontools I can exclude a hardware failure. I've found that gpu-manager and systemd fail to load kernel modules. This is among the output of journalctl | grep modules Jan 10 13:12:34 systemd[1]: systemd-modules-load.service: Unit entered failed state. Jan 10 13:12:34 systemd[1]: systemd-modules-load.service: Failed with result 'exit-code'. Jan 10 13:12:49 gpu-manager[791]: Error: can't open /lib/modules/4.4.0-57-generic/updates/dkms Jan 10 13:12:49 gpu-manager[791]: Error: can't open /lib/modules/4.4.0-57-generic/updates/dkms (terminal-output attached) dito with latest kernel Jan 11 07:53:04 gpu-manager[786]: Error: can't open /lib/modules/4.4.0-59-generic/updates/dkms Jan 11 07:53:04 gpu-manager[786]: Error: can't open /lib/modules/4.4.0-59-generic/updates/dkms ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: ubuntu-drivers-common 1:0.4.17.2 ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35 Uname: Linux 4.4.0-57-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 CurrentDesktop: Unity Date: Tue Jan 10 14:37:00 2017 InstallationDate: Installed on 2012-02-05 (1801 days ago) InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120204) SourcePackage: ubuntu-drivers-common UpgradeStatus: Upgraded to xenial on 2016-08-01 (162 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1655348/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

