Public bug reported:

problem is there since upgrading from 12.10 to 13.04
dmesg shows [drm:__gen6_gt_force_wake_mt_get] *ERROR* Timed out waiting for 
forcewake old ack to clear.]
when kms is disabled problem is not there (aka use nomodeset when kernel boots)

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Fri Apr 26 00:04:57 2013
DistUpgraded: 2013-04-25 22:14:44,950 DEBUG can't find apport
DistroCodename: raring
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
GpuHangFrequency: Continuously
GpuHangReproducibility: Yes, I can easily reproduce it
GpuHangStarted: Today
GraphicsCard:
 Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller 
[8086:0162] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Device [1458:d000]
MachineType: Gigabyte Technology Co., Ltd. Z68X-UD3H-B3
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-19-generic 
root=/dev/mapper/vol00-lvroot ro crashkernel=384M-2G:64M,2G-:128M quiet
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to raring on 2013-04-25 (0 days ago)
dmi.bios.date: 03/20/2012
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F12
dmi.board.name: Z68X-UD3H-B3
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF12:bd03/20/2012:svnGigabyteTechnologyCo.,Ltd.:pnZ68X-UD3H-B3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnZ68X-UD3H-B3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: Z68X-UD3H-B3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.43-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.1-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.1-0ubuntu3
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 2:2.21.6-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1
xserver.bootTime: Fri Apr 26 00:01:51 2013
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        CHICONY HP Basic USB Keyboard KEYBOARD, id 8
 input        Logitech USB Optical Mouse MOUSE, id 9
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.13.3-0ubuntu6
xserver.video_driver: intel

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


** Tags: amd64 apport-bug freeze raring ubuntu

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https://bugs.launchpad.net/bugs/1172937

Title:
  Xorg freeze

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