Next time the problem happens please run: journalctl -b0 > journal.txt
But if you need to reboot after a freeze then please run this instead: journalctl -b-1 > prevboot.txt and attach the resulting text file here. Please also tell us if you have any relevant files in /var/crash/ ** Tags added: nouveau ** Summary changed: - Xorg freeze + [nouveau] Screen freeze ** Package changed: xorg (Ubuntu) => ubuntu ** Changed in: ubuntu Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1900181 Title: [nouveau] Screen freeze To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1900181/+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