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Public bug reported:

Binary package hint: x11-xserver-utils

After switching to some video mode and back (as this harware/video test does), the whole display becomes and remains completely garbled. Vertical lines flash in colors usually related to what should be displayed; the rest of the system works, screen updates occur normally, ie a new dialog will translate into "more gray stuff" spread over the monitor.
The monitor (DVI) syncs properly and well (no delay etc) at the expected resolution and refresh rate. Powercycling it has no effect.
The garbled content shifts dramatically in position and color (large black areas appear and disappear) in response to mouse movements, like if the cursor was dragging it at all times.
Switching ptys via Ctrl-Alt-F<n> works but the consoles all look solid grey area with few black vertical lines.
Attempting to restart the X-server didn't work (but I might have fat-fingered something); reboot proceeds normally and restores proper operation.
The same behavior was very rarely observed in intrepid as well, after screen-saver/locker ran.
The machine's "marketing name" is Dell Optiplex 745.

ProblemType: Bug
Architecture: amd64
CheckboxCommand: xrandr_cycle
CheckboxData:
 Screen permanently garbled; system otherwise operational.
 Reboot required to restore operation.
CheckboxDescription:
 Click Test to cycle through the detected video modes for your system.
 
 Did the screen appear to be working for each mode?
CheckboxTest: xrandr_cycle
Date: Wed Nov  4 18:16:29 2009
DistroRelease: Ubuntu 9.10
MachineType: Dell Inc. OptiPlex 745
Package: x11-xserver-utils 7.4+2ubuntu3
ProcCmdLine: root=UUID=b32081ba-33fb-402b-bdca-ce832abb4740 ro quiet splash
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
RelatedPackageVersions:
 xserver-xorg 1:7.4+3ubuntu7
 libgl1-mesa-glx 7.6.0-1ubuntu4
 libdrm2 2.4.14-1ubuntu1
 xserver-xorg-video-intel 2:2.9.0-1ubuntu2
 xserver-xorg-video-ati N/A
SourcePackage: x11-xserver-utils
Tags: checkbox-bug
Uname: Linux 2.6.31-14-generic x86_64
XsessionErrors:
 (gnome-settings-daemon:2146): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:2146): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (polkit-gnome-authentication-agent-1:2177): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (nautilus:2169): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (gnome-panel:2168): Gdk-WARNING **: /build/buildd/gtk+2.0-2.18.3/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window
dmi.bios.date: 05/21/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.3.1
dmi.board.name: 0HR330
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 6
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr2.3.1:bd05/21/2007:svnDellInc.:pnOptiPlex745:pvr:rvnDellInc.:rn0HR330:rvr:cvnDellInc.:ct6:cvr:
dmi.product.name: OptiPlex 745
dmi.sys.vendor: Dell Inc.
fglrx: Not loaded
glxinfo: Error: [Errno 2] No such file or directory
system:
 distro:             Ubuntu
 architecture:       x86_64kernel:             2.6.31-14-generic

** Affects: x11-xserver-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug checkbox-bug

-- 
Display permanently garbled after video mode change (i965 to DVI)
https://bugs.launchpad.net/bugs/475007
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