SNA enabled causes Intel integrated graphics to only boot in low graphics mode

After successfully installing 13.04 on my Dell XPS 15z, I restarted the laptop, successfully booting into Ubuntu with no issues.

Restarting after that then gives the 'System is running in low graphics mode' message.

I get this everytime now. Have re-installed with latest build and same issue.

I can only boot in recovery mode

UPDATE: In the ubuntu forums thread (http://ubuntuforums.org/showthread.php?t=2115355), jbicha, recommended the following which fixed (or worked around) the problem

"Perhaps this is a problem with SNA which has been enabled by default for raring.

Add (or edit if it already exists) /etc/X11/xorg.conf and I think this is the code you need:"

Code:

Section "Device"
   Identifier "Intel Graphics"
   Driver "intel"
   Option "AccelMethod" "uxa"
EndSection

Extra info:

Other dell users seem to be experiencing similar issues: http://ubuntuforums.org/showthread.php?t=2115355

I installed and use the parameters mentioned here: https://wiki.ubuntu.com/HardwareSupport/Machines/Laptops/Dell/XPS/15z

I have an optimus card, which the Nvidia card should be disabled as it does not work

Sometimes when booting in recovery mode it says there are errors on the drive and would I like to fix them, I agree and it fixes them

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: xorg 1:7.7+1ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-6.11-generic 3.8.0-rc7
Uname: Linux 3.8.0-6-generic x86_64
.tmp.unity.support.test.1:

ApportVersion: 2.8-0ubuntu4
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
Date: Wed Feb 13 23:45:48 2013
DistUpgraded: Fresh install
DistroCodename: raring
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:0446]
 NVIDIA Corporation GF108 [GeForce GT 540M] [10de:0df5] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:0446]
InstallationDate: Installed on 2013-02-11 (2 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130210)
MachineType: Dell Inc. Dell System XPS 15Z
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-6-generic root=UUID=93acc5a7-d531-4af3-a215-472a7bd065d6 ro recovery nomodeset
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/27/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 060G42
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.:bvrA04:bd07/27/2011:svnDellInc.:pnDellSystemXPS15Z:pvr:rvnDellInc.:rn060G42:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS 15Z
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.9~daily13.02.08-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.42-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.2-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.2-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.6-0ubuntu2