Games start to slow just after 2-3 minutes of play. Sudden graphics freeze

[razor]

Even native Linux games (e.g Nexius) with normal settings are seeing this error. Currently I am using oibaf ppa, but I had this problem since ubuntu 13.04 fresh install. Starting from some versions of mesa (9.1) this error has been persistent. It also causes extreme heating.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
Uname: Linux 3.8.0-30-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.9.2-0ubuntu8.3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Tue Sep 17 07:16:01 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
DkmsStatus: fglrx, 13.200, 3.8.0-30-generic, x86_64: installed
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:04c1]
 Advanced Micro Devices, Inc. [AMD/ATI] Seymour [Radeon HD 6400M/7400M Series] [1002:6760] (rev ff) (prog-if ff)
InstallationDate: Installed on 2013-09-16 (1 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: Dell Inc. Dell System Inspiron N4110
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-30-generic root=UUID=70796788-0dfa-462e-9ede-6f04b5215c90 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.name: 07GP33
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA12:bd09/07/2012:svnDellInc.:pnDellSystemInspironN4110:pvr:rvnDellInc.:rn07GP33:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System Inspiron N4110
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.9~daily13.06.19~13.04-0ubuntu1
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.46+git1309121700.b6da44~gd~r
version.libgl1-mesa-dri: libgl1-mesa-dri 9.3~git1309100926.395b94~gd~r
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 9.3~git1309100926.395b94~gd~r
version.libgl1-mesa-glx: libgl1-mesa-glx 9.3~git1309100926.395b94~gd~r
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 1:7.2.0+git1309100904.fdb756~gd~r
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.902+git1309121702.76790d~gd~r
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9+git1307310858.036423~gd~r

[Timo Aaltonen (tjaalton)]

fglrx doesn't use mesa at all

[razor (razorxpress)]

While using this I switch to integrated graphics card using "pkexec aticonfig --px-igpu". I then restart X. This happens even if I uninstall catalyst (after which it switches from UXA to SNA) and the result is same.