ubuntu-x-swat team mailing list archive

[Jonathan Keeling <jmjk2@xxxxxxxxxx>]

Public bug reported:

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 2.6.32.29+drm33.13
Uname: Linux 2.6.32-30-generic i686
Architecture: i386
Date: Sun Apr 10 17:33:07 2011
DkmsStatus:
 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
ProcEnviron:
 PATH=(custom, user)
 LANG=en_GB.utf8
 SHELL=/bin/bash
SourcePackage: xorg
dmi.bios.date: 09/17/2009
dmi.bios.vendor: LENOVO
dmi.bios.version: 6HET24WW (1.09 )
dmi.board.name: 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:
dmi.product.name: 2801CTO
dmi.product.version: ThinkPad T400s
dmi.sys.vendor: LENOVO
system:
 distro:             Ubuntu
 codename:           lucid
 architecture:       i686
 kernel:             2.6.32-30-generic

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 lucid

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https://bugs.launchpad.net/bugs/756675

Title:
  Limited set of resolutions available in xrandr after switching
  external monitor