Limited set of resolutions available in xrandr after switching external monitor

Bug #756675 reported by Jonathan Keeling on 2011-04-10
This bug affects 1 person
Affects Status Importance Assigned to Milestone
xorg-server (Ubuntu)

Bug Description

Binary package hint: xorg

Normally, after booting, when I connect to an external monitor (thinkvision L2250p wide), I can access the full range of resolutions. However, if I connect to another external monitor, or data projector, and then reconnect to the first monitor, the range of resolutions available is reduced.

I can manually add the resolution with:

xrandr --newmode "big" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
xrandr --addmode VGA1 big

Rebooting restores the full set of resolutions.
The output of xrandr, ddcprobe and get-edid|parse-edid are attached.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: xorg 1:7.5+5ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-30.59-generic
Uname: Linux 2.6.32-30-generic i686
Architecture: i386
Date: Sun Apr 10 17:33:07 2011
 blcr, 0.8.2, 2.6.32-29-generic, i686: installed
 blcr, 0.8.2, 2.6.32-30-generic, i686: installed
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
MachineType: LENOVO 2801CTO
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-30-generic root=UUID=a5aebcfb-c96a-4000-9792-ee07a9eab970 ro quiet splash
 PATH=(custom, user)
SourcePackage: xorg 09/17/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 6HET24WW (1.09 ) 2801CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6HET24WW(1.09):bd09/17/2009:svnLENOVO:pn2801CTO:pvrThinkPadT400s:rvnLENOVO:rn2801CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: 2801CTO
dmi.product.version: ThinkPad T400s
dmi.sys.vendor: LENOVO
 distro: Ubuntu
 codename: lucid
 architecture: i686
 kernel: 2.6.32-30-generic

Jonathan Keeling (jmjk2) wrote :
Jonathan Keeling (jmjk2) wrote :
Jonathan Keeling (jmjk2) wrote :
bugbot (bugbot) on 2011-04-11
affects: xorg (Ubuntu) → xorg-server (Ubuntu)
Bryce Harrington (bryce) wrote :

Hi Jonathan,

Would you mind re-testing this against Oneiric? You can get a Live ISO image from that should be sufficient for testing against.

Changed in xorg-server (Ubuntu):
status: New → Incomplete

On Sat, 2011-11-19 at 00:42 +0000, Bryce Harrington wrote:
> Hi Jonathan,
> Would you mind re-testing this against Oneiric? You can get a Live ISO
> image from that should be sufficient for testing
> against.

With apologies for the delay, I have now tested this using the "Try
Ubuntu" option from the CD, and it appears to be fixed.

Best wishes,
Jonathan Keeling
Lecturer in Theoretical Condensed Matter Physics and EPSRC CAF
SUPA, School of Physics and Astronomy, University of St Andrews

Bryce Harrington (bryce) wrote :

Thanks for testing and confirming it as fixed.

Changed in xorg-server (Ubuntu):
status: Incomplete → Fix Released
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