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[Tim Allen <screwtape@xxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-intel

I have an Apple MacBook (Model "Macbook2,1") with Intel GM945 integrated
graphics. I also have the official proprietary-to-DVI dongle, and a Dell
LCD flat-panel with a native resolution of 1600x1200. When I'm at home,
my preferred setup is to use the external monitor (and an external USB
keyboard and mouse), and turn off the laptop's internal display (so I
don't wear out the backlight). Unfortunately, if I disable the internal
display and the external display is using a resolution higher than
1024x768, the external display goes nuts.

I have not experimented much with gnome-display-properties, as it has an
annoying habit of trying to adjust my xorg.conf, but I spent some time
playing with xrandr directly:

With the internal display set to 1280x800 (native resolution) and the external display set to 1600x1200 (native resolution):
 - "xrandr --output LVDS --below TMDS-1" works fine (putting the internal display below the external one, both active)
 - "xrandr --output TMDS-1 --off" works fine (disabling the internal display)
 - "xrandr --output LVDS --off" works as long as the TMDS-1 mode is 1024x768 or lower.

Since I can't disable the internal display, my current workaround is to
run "xrandr --auto" (enabling both displays at their native resolution)
and then run "xrandr --output LVDS --pos 0x0 --set BACKLIGHT 2"
(overlapping the internal and external displays, and disabling the
internal display's backlight - the strange value is from
https://bugs.launchpad.net/bugs/367309)

I will attach screenshots of the problem and a log-fragment.

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
Package: xserver-xorg-video-intel 2:2.7.0-1ubuntu2~xup~1
ProcEnviron:
 PATH=(cuusernameom, user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
ProcVersion: Linux version 2.6.28-11-generic (buildd@creusernameed) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC 2009
SourcePackage: xserver-xorg-video-intel
Uname: Linux 2.6.28-11-generic x86_64
UnreportableReason: This is not a genuine Ubuntu package

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug

-- 
Video corruption when disabling internal monitor
https://bugs.launchpad.net/bugs/377598
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