I discussed this bug with the #radeon, #nouveau and #xorg IRC channels. We discovered that I was able to boot when booting with the nouveau.modeset=0 kernel parameter. (The radeon.modeset=0 kernel parameter had no effect).
After the machine is booted, attempting to "modprobe -v nouveau modeset=1" causes the machine to hard reboot consistently, same as happens during the boot process. We tried attaching a netconsole, but nothing was printed to it except some swap messages on bootup. It looks like this bug is related to the nouveau drm module. -- 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/1128801 Title: Adding second graphics card causes infinite reboot loop for Ubuntu, but Windows boots. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1128801/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
