I have Qt configured (in QtUbuntu/QtMir) to use multi-threaded GL rendering, so we're probably hitting Nouveau's limitations here.
As workaround, I can add code to QtUbuntu/QtMir use single-threaded GL for Nouveau. If this is easily reproduced, can you try initctl set-env --global QSG_RENDER_LOOP=basic and see if everything is more stable? If so, the workaround should do the trick ** Changed in: qtmir (Ubuntu) Status: Invalid => Incomplete -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1553328 Title: Mir/Unity8 crashes/freezes on nouveau (nv50) in pushbuf_kref() especially with multiple monitors, webbrowser-app or system settings To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1553328/+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