Comment 0 for bug 1259423

As requested by Christopher M. Penalver, opening a separate bug for this hardware configuration as a possible duplicate of Bug #1069199

Description:
After installing ATI proprietary drivers for my Radeon video card, Unity or GNOME ( I tried both) don't start anymore. LightDM shows up, and I'm able to log in, but after logging in the screen goes black, pauses and then I'm presented with the lightDM login screen again.

Xserver logs indicate that the driver fglrx does not load.

Reverting to the opensource version gets things working again
E.g. To get back to things working I have to run

$sudo dpkg --purge fglrx fglrx-amdcccle fglrx-dev && sudo apt-get install xserver-xorg-video-ati xserver-xorg-video-radeon

ProblemType: Bug
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
DistUpgraded: 2013-10-18 08:24:06,128 DEBUG enabling apt cron job
DistroCodename: saucy
DistroRelease: Ubuntu 13.10
DistroVariant: ubuntu
DkmsStatus: fglrx, 8.970: added
XorgLog:
 [ 63.002]
 X.Org X Server 1.14.3
 Release Date: 2013-09-12
 [ 63.002] X Protocol Version 11, Revision 0
 [ 63.002] Build Operating System: Linux 3.2.0-37-generic x86_64 Ubuntu
 [ 63.002] Current Operating System: Linux aodius 3.11.0-14-generic #21-Ubuntu SMP Tue Nov 12 17:04:55 UTC 2013 x86_64
 [ 63.002] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.11.0-14-generic root=UUID=a153e9f7-6ba9-4e43-85ae-951f1d3b7e38 ro quiet splash vt.handoff=7
 [ 63.002] Build Date: 15 October 2013 09:23:37AM
 [ 63.002] xorg-server 2:1.14.3-3ubuntu2 (For technical support please see http://www.ubuntu.com/support)
...
 [ 63.010] (II) LoadModule: "fglrx"
 [ 63.010] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so
 [ 63.025] (EE) Failed to load /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: /usr/lib/x86_64-linux-gn
u/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: undefined symbol: noXFree86DRIExtension
 [ 63.025] (II) UnloadModule: "fglrx"
 [ 63.025] (II) Unloading fglrx
 [ 63.025] (EE) Failed to load module "fglrx" (loader failed, 7)
...
 [ 63.025] (II) LoadModule: "fglrx"
 [ 63.026] (II) Loading /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so
 [ 63.040] (EE) Failed to load /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: /usr/lib/x86_64-linux-gn
u/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: undefined symbol: noXFree86DRIExtension
 [ 63.040] (II) UnloadModule: "fglrx"
 [ 63.040] (II) Unloading fglrx
 [ 63.040] (EE) Failed to load module "fglrx" (loader failed, 7)
...
xserver.errors:
 Failed to load /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: undefined symbol: noXFree86DRIExtension
 Failed to load module "fglrx" (loader failed, 7)
 Failed to load /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so: undefined symbol: noXFree86DRIExtension
 Failed to load module "fglrx" (loader failed, 7)
 open /dev/dri/card0: No such file or directory
 Screen 0 deleted because of no matching config section.
 GLX error: Can not get required symbols.
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 display edid version 1.3
 display manufacturer AUO
 display model 197b
 display serial no. 0
 product id 6523
 size horizontal 331 mm
 size max horizontal 33 cm
 size max vertical 21 cm
 size vertical 207 mm
 vendor AUO

xserver.version: 2:1.14.3-3ubuntu2