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 Desktop Packages, 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. Status in “xorg” package in Ubuntu: New Bug description: I have a motherboard which is able to use both the integrated graphics card and a dedicated graphics card at the same time. The integrated graphics card is an RS880 [Radeon HD 4200] with two outputs, powered by the foss radeon driver. To this I am trying to add a PCI-Express NVidia Quadro FX (I think it's a Quadro FX 3450). Windows 7 boots fine on this configuration and is able to use both cards concurrently (one monitor attached to each card). However, Ubuntu enters an infinite reboot loop with this configuration. The Live USB has the same problem. I was able to boot it into recovery mode, but was not able to start X from this configuration (lightdm hangs with a black screen, and 'startx' says my user account is not authorized). When I configured my BIOS to use only the Quadro FX without the integrated card, Ubuntu booted fine using the nouveau driver. ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: xserver-xorg 1:7.7+1ubuntu4 ProcVersionSignature: Ubuntu 3.5.0-23.35-generic 3.5.7.2 Uname: Linux 3.5.0-23-generic x86_64 ApportVersion: 2.6.1-0ubuntu10 Architecture: amd64 Date: Mon Feb 18 00:02:43 2013 MarkForUpload: True ProcEnviron: LANGUAGE=en_CA:en TERM=xterm PATH=(custom, no user) LANG=en_CA.UTF-8 SHELL=/bin/bash SourcePackage: xorg UpgradeStatus: Upgraded to quantal on 2012-10-22 (119 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1128801/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
