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After upgrading from Natty to Oneiric, my second monitor was disabled on
first login. I opened the resolution dialogue via the system menu and
enabled it (both monitors and their resolutions were correctly shown in
this dialogue). After clicking "apply", nothing changed but a popup box
appeared saying "The chosen screen configuration could not be applied
(null)".

Obviously, changing the resolution should work (it did in Natty), and if
it fails, the message should be more helpful than "null".

I have a Radeon HD 4870 and use the usual radeon driver.

Manually enabling the second monitor with xrandr led to a Compiz crash,
but I'll file a separate bug about that if I can reproduce it.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic-pae 3.0.4
Uname: Linux 3.0.0-12-generic-pae i686
.tmp.unity.support.test.0:
 
ApportVersion: 1.23-0ubuntu2
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,compiztoolbox,place,session,gnomecompat,resize,vpswitch,mousepoll,grid,snap,regex,imgpng,wall,move,unitymtgrabhandles,animation,fade,scale,expo,workarounds,ezoom,unityshell]
CompositorRunning: compiz
CurrentDmesg:
 [   29.109352] EXT4-fs (dm-2): re-mounted. Opts: commit=0
 [   30.979254] init: plymouth-stop pre-start process (1856) terminated with status 1
Date: Fri Sep 30 20:16:35 2011
DistUpgraded: Log time: 2011-09-30 18:47:44.708272
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 ATI Technologies Inc RV770 [Radeon HD 4870] [1002:9440] (prog-if 00 [VGA controller])
   Subsystem: PC Partner Limited Device [174b:0851]
MachineType: System manufacturer System Product Name
ProcEnviron:
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.0.0-12-generic-pae root=/dev/mapper/linux-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to oneiric on 2011-09-30 (0 days ago)
dmi.bios.date: 11/25/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0704
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A79XTD EVO
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0X
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0704:bd11/25/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A79XTDEVO:rvrRevX.0X:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu1
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

** Affects: gnome-control-center (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug compiz-0.9 i386 oneiric running-unity ubuntu
-- 
[Oneiric] Setting screen resolution fails with error message "null"
https://bugs.launchpad.net/bugs/863547
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