As a temporary workaround: removing the proprietary nvidia drivers (nvidia-driver-390) fixed the issue for me.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-video-nouveau in Ubuntu. https://bugs.launchpad.net/bugs/1785253 Title: kernel and syslogs are filled by "nouveau 0000:01:00.0: fifo: SCHED_ERROR 20" Status in xserver-xorg-video-nouveau package in Ubuntu: Confirmed Bug description: After waking from suspend kern and syslog are filled following: Aug 2 12:35:20 mycomp kernel: [ 4224.589205] nouveau 0000:01:00.0: fifo: SCHED_ERROR 20 [] Aug 2 12:35:20 mycomp kernel: [ 4224.589216] nouveau 0000:01:00.0: fifo: SCHED_ERROR 20 [] Aug 2 12:35:20 mycomp kernel: [ 4224.589228] nouveau 0000:01:00.0: fifo: SCHED_ERROR 20 [] Fills up root rapidly within minutes and therefore freezes the system and systemd-journald runs with CPU 100%. If root is filled completely, the computer is unbootable and can only be recovered through rescue mode. installed package: xserver-xorg-video-nouveau/bionic,now 1:1.0.15-2 amd64 Laptop: Asus ZenBook UX303UB lsb_release -rd: Description: Ubuntu 18.04.1 LTS Release: 18.04 uname -a: Linux mycomp 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Someone else have reported the same bug here: https://wyldeplayground.net/kern-and-syslog-full-with-the-same-error- jul-15-110756-asimsafwan-kernel/ Probably related bug: https://bugzilla.redhat.com/show_bug.cgi?id=1560389 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1785253/+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