"nouveau.config=NvMSI=0" does seem to work around the problem. A patch to disable MSI on these chips was linked in the upstream bug report:
https://bugs.freedesktop.org/show_bug.cgi?id=87361 http://lists.freedesktop.org/archives/nouveau/2014-December/019417.html dmesg still mentions "MMIO write FAULT" multiple times, but that's probably a separate bug; at least it hasn't frozen or scrambled yet. If I should open a separate report, or provide any additional information, just let me know what you need. ** Bug watch added: freedesktop.org Bugzilla #87361 https://bugs.freedesktop.org/show_bug.cgi?id=87361 -- 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/1181902 Title: Nouveau driver glitch on Ubuntu 13.04 will cause system to freeze under certain conditions To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1181902/+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
