Public bug reported:

I have the Dell E6510 laptop with the following Intel VGA: "Core
Processor Integrated Graphics Controller [8086:0046] (rev 02)". The
laptop sits docked in the docking station. An external 1920x1200 monitor
is connected via the docking station's DisplayPort. I have configured
the laptop's display (eDP1) to be disabled while docked, as shown in
xrandr:

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192
eDP1 connected (normal left inverted right x axis y axis)
   1600x900       60.0 +   40.0  
   1440x900       59.9  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 
324mm
   1920x1200      60.0*+
   1920x1080      60.0  
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0  

When the SNA is enabled and the notebook is ejected from the docking
station, the screen becomes garbled on the internal screen (please see
attachment for a screenshot). When I switch to old UXA using the
following xorg.conf:

$ cat /etc/X11/xorg.conf 
Section "Device"
  Identifier "Card0"
  Driver "intel"
  Option "AccelMethod" "uxa"
EndSection

the laptop detachment works flawlessly and the screen is not garbled.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-18.28-generic 3.8.6
Uname: Linux 3.8.0-18-generic i686
.tmp.unity.support.test.0:
 
ApportVersion: 2.9.2-0ubuntu8
Architecture: i386
CompizPlugins: 
[core,composite,opengl,decor,move,regex,gnomecompat,vpswitch,mousepoll,resize,place,grid,compiztoolbox,snap,imgpng,unitymtgrabhandles,session,animation,workarounds,wall,expo,ezoom,fade,scale,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Thu Apr 18 09:20:49 2013
DistUpgraded: 2013-04-12 09:14:34,410 DEBUG enabling apt cron job
DistroCodename: raring
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.2.10, 3.8.0-17-generic, i686: installed
 virtualbox, 4.2.10, 3.8.0-18-generic, i686: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 02) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:040b]
InstallationDate: Installed on 2010-05-17 (1066 days ago)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: Dell Inc. Latitude E6510
MarkForUpload: True
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-18-generic 
root=UUID=02dfb985-99c1-431d-882f-87475db02062 ro 
crashkernel=384M-2G:64M,2G-:128M splash elevator=noop
SourcePackage: xorg
UpgradeStatus: Upgraded to raring on 2013-04-12 (6 days ago)
XorgConf:
 Section "Device"
   Identifier "Card0"
   Driver "intel"
   Option "AccelMethod" "uxa"
 EndSection
dmi.bios.date: 11/20/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 02K3Y4
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd11/20/2010:svnDellInc.:pnLatitudeE6510:pvr0001:rvnDellInc.:rn02K3Y4:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6510
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.9~daily13.04.15-0ubuntu1
version.libdrm2: libdrm2 2.4.43-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.1-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.1-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1

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


** Tags: apport-bug compiz-0.9 i386 raring ubuntu

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https://bugs.launchpad.net/bugs/1170225

Title:
  Intel SNA garbled screen when detaching from the docking station

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