Public bug reported:
My system has a Radeon HD 7750 and Radeon HD 6450, together driving 4 displays:
Left: VGA on 7750 via DisplayPort adaptor, 1280x1024
Middle: DVI on 7750, 1920x1080
Right: HDMI on 7750, 1680x1050
Top (above Middle): VGA on 6450, 1280x1024
With only Left, Middle and Right enabled, everything works fine. When I try to
enable the top display by running:
$ xrandr --output VGA-1-0 --above DVI-0 --mode 1280x1024
then the top screen only displays noise, and the entire system will lock up for
about 10 seconds at a time, then run again for 10 seconds (and the top screen
goes blank), then lock up again, repeating until the top screen is disabled
again. syslog and kern.log report one of the GPUs is locking up.
With the proprietary driver fglrx, I can run all 4 displays, but it
requires the use of Xinerama, so I have no RandR or compositing, which
stinks. With the open source driver RandR and compositing work fine.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
Date: Tue Oct 22 12:59:19 2013
InstallationDate: Installed on 2013-10-22 (0 days ago)
InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
SourcePackage: xserver-xorg-video-ati
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug saucy
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https://bugs.launchpad.net/bugs/1243311
Title:
GPU lockup when using 2 video cards
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