libGL gets lost when changing from FGLRX to free driver

[Amir Livne Bar-on]

(I'm sorry if this gets reported to the wrong place; it's hard for me to work the bug-reporting GUI)

I installed Ubuntu 11.10 a few days ago.
I also installed and changed to the proprietary ATI Radeon drivers. The drivers were enabled through the System Settings > Additional Drivers dialog box.
Today I wanted to test the free drivers again, so using the same dialog box I disabled the proprietary drivers.
After a restart, X would start with only metacity and nautilus. Unity would not start.

Trying to start unity manually from a terminal gave an error that compiz could not load its plugins, since they depend on libGL.so.1. Of course unity did not show.
This library is provided from both FGLRX and from the Mesa project. Reinstalling the packages libgl1-mesa-* and rebooting allowed the system to find libGL, so this is a workaround for this bug.

I don't know how library path resolving works in modern Linux systems, or what exactly the Additional Drivers dialog does, but it seems that reinstalling the mesa libraries when removing proprietary 3d display drivers would solve this for other users.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu2
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,mousepoll,snap,move,resize,regex,gnomecompat,workarounds,place,commands,vpswitch,imgpng,grid,wall,fade,session,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Sun Oct 2 17:15:26 2011
DistUpgraded: Log time: 2011-09-25 16:29:19.690101
DistroCodename: oneiric
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 ATI Technologies Inc RV710 [Radeon HD 4350] [1002:954f] (prog-if 00 [VGA controller])
   Subsystem: Hightech Information System Ltd. Device [1787:2271]
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: MICRO-STAR INTERNATIONAL CO.,LTD MS-7529
PlymouthDebug: Error: [Errno 13] Permission denied: '/var/log/plymouth-debug.log'
ProcKernelCmdLine: root=UUID=773c72ee-b51a-4fdf-a0d3-092b4fe8b3e8 ro xforcevesa splash quiet
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to oneiric on 2011-10-01 (1 days ago)
dmi.bios.date: 04/21/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: V1.4
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: G31M3-F V2(MS-7529)
dmi.board.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.board.version: 1.0
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.4:bd04/21/2009:svnMICRO-STARINTERNATIONALCO.,LTD:pnMS-7529:pvr1.0:rvnMICRO-STARINTERNATIONALCO.,LTD:rnG31M3-FV2(MS-7529):rvr1.0:cvnMICRO-STARINTERNATIONALCO.,LTD:ct3:cvr1.0:
dmi.product.name: MS-7529
dmi.product.version: 1.0
dmi.sys.vendor: MICRO-STAR INTERNATIONAL CO.,LTD
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 2:2.15.901-1ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.