Public bug reported:
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)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug quantal
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https://bugs.launchpad.net/bugs/1128801
Title:
Adding second graphics card causes infinite reboot loop for Ubuntu,
but Windows boots.
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