Public bug reported: Since about a week ago, X started locking up randomly (about twice a day). I don’t know what kind of details are relevant but here are some observations:
- When it locks up the screen is always garbled. - The keyboard would initially work, but if I don’t kill X or reboot right away the keyboard would also stop working after a short time, at which point the system would appear to be locked up hard. - However, ssh would still work. - Within the ssh session, any action on the framebuffer would hang. For example, chvt would hang (but can still be suspended). - Sometimes Xorg can be killed. If Xorg is killed the screen (and keyboard) would appear to return to normal. - The lockups started around the time hardware acceleration started working on my hardware (NVidia GeForce 9400M) so the problem seems to be related to hardware acceleration. - The number of simultaneous hardware-accelerated apps using the framebuffer seems to determine whether a lockup will occur. For example, playing the same hardware-accelerated game (in Chrome) would eventually cause an lockup, but playing the same game in only one Chrome window seems to be safe. - Before a lockup happens, messages similar to the following would appear on the tty where the hardware-accelerated app (e.g., Chrome) is started: nouveau: 0x20391200 nouveau: 0x00087080 nouveau: 0x00000000 nouveau: 0x203912cf nouveau: 0x000c6910 nouveau: 0x20000034 nouveau: 0x00000000 nouveau: 0x20391224 nouveau: 0x00087088 nouveau: 0x00000000 nouveau: 0x203912cf nouveau: 0x000475dc nouveau: 0x00000004 nouveau: 0x000475ec nouveau: 0x00000006 nouveau: 0x000375f0 nouveau: 0x00000003 nouveau: ch4: psh 0000000c 0000000d00 0000000d0c nouveau: 0x00020000 nouveau: 0x00000003 nouveau: 0x00010003 nouveau: ch4: psh 00000000 000006945c 0000069480 nouveau: 0x000475ec nouveau: 0x00000000 nouveau: 0x000475e0 nouveau: 0x00000000 nouveau: 0x00107b00 nouveau: 0x00000000 nouveau: 0x20217000 nouveau: 0x002f32a4 nouveau: 0x1000f010 This might be the same bug as Bug #1675777, but the symptoms seem to be slightly different: - In Bug #1675777 the "nouveau" log messages appear in the system log, but in my case it appears on the terminal. - Also, Bug #1675777 is filed against Ubuntu 17.04, but this is on an Ubuntu 16.04.2 LTS. ** Affects: xserver-xorg-video-nouveau (Ubuntu) Importance: Undecided Status: New ** Attachment added: "apport.xserver-xorg-video-nouveau.tqo_6lsr.apport.gz" https://bugs.launchpad.net/bugs/1708019/+attachment/4925493/+files/apport.xserver-xorg-video-nouveau.tqo_6lsr.apport.gz -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/1708019 Title: Random screen lockup with hardware acceleration in 16.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1708019/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp