Comment 0 for bug 753971

Binary package hint: xorg

Steps to reproduce:
1- Open the Monitors control panel.
2- Choose a different resolution and orientation (we use 640x480 upside down).
3- Press Apply.
4- Select "Restore original configuration" to return to how things were originally.

Expected result:
- Resolution restores, screen rebuilds and is visually identical to how it was before the resolution changed.

Actual result:
- Display is corrupted in various ways. On some systems only the background or parts of it are visible. On others, there's some misplacement of elements. Some others show garbling on all or parts of the screen. On all systems, moving the pointer, dragging windows or generally forcing the system to redraw seems to eventually restore the display to a usable state.

We also observed the same problem when plugging in an external display: the corruption happens when connecting the external monitor, and can be restored by dragging things around. When unplugging the external display, the integrated screen becomes garbled as described.

The systems were originally installed with Natty Beta1 (March 30, 2011), we did a full update/dist-upgrade on April 7, 2011 and confirmed that the behavior is still present.

The system I'm reporting this from is a Dell Inspiron 1545, but about half the systems we tested B1 on exhibited this problem (18 systems out of 32). I'll update shortly with a list of affected systems.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xorg 1:7.6+4ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
DRM.card0.LVDS.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1366x768 1280x720 1152x768 1024x768 800x600 848x480 720x480 640x480
 edid-base64: AP///////wAOFL8UAAAAACUTAQOAIhN4Ck5NnldUkSYPUFQAAAABAQEBAQEBAQEBAQEBAQEBeB1WwlAAJjA7J1oAWMEQAAAaeB1WwlAAJjA7J1oAWMEQAAAaAAAA/gBHNTI2SoAxNTZXQTEgAAAAAAAMEhcePWeg/wEBCiAgAIk=
DRM.card0.VGA.1:
 status: disconnected
 enabled: disabled
 dpms: Off
 modes:
 edid-base64:
Date: Thu Apr 7 15:13:05 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard:
 ATI Technologies Inc M92 LP [Mobility Radeon HD 4300 Series] [1002:9552] (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:02aa]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
MachineType: Dell Inc. Inspiron 1545
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=8d9f6a25-f693-4f12-8592-7ad733739183 ro quiet splash initcall_debug vt.handoff=7
Renderer: Unknown
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/27/2009
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0G437N
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA11:bd08/27/2009:svnDellInc.:pnInspiron1545:pvr:rvnDellInc.:rn0G437N:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: Inspiron 1545
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.4+bzr20110406-0ubuntu1
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.1-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu6