HIS Radeon HD 6870 configuration in Debian wheezy

[Piotr Winter]

Hello
I need help with radeon hd 6870 setup in debian wheezy. I'm a linux newbie.

Autodetection did not work, since I only have low resolution enabled (max
1280x1024)
I did the search and found Debian AtiHowTo document.
I checked the driver and I have already proper one named "radeon" installed
(judging by synaptic package manager)
Then I checked xorg.conf and there wasn't any in /etc/X11
So I run "Xorg -configure" as root after booting in safe mode and got
segmentation fault.

attachements:
"Xorg -configure" output - log.txt
xorg.conf.new from /root directory

I can attach log mentioned in "Xorg - configure" output -
/var/log/xorg.0.log if needed

Copying xorg.conf.new to /etc/X11/xorg.conf didn't change anything.

Anyone willing to help?
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X.Org X Server 1.12.4
Release Date: 2012-08-27
X Protocol Version 11, Revision 0
Build Operating System: Linux 3.2.0-4-amd64 x86_64 Debian
Current Operating System: Linux winter 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-4-amd64 root=UUID=7835326b-e438-41e2-8439-5e86842614dc ro single
Build Date: 17 April 2013  10:22:47AM
xorg-server 2:1.12.4-6 (Julien Cristau <jcristau at debian.org>) 
Current version of pixman: 0.26.0
	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Sat Sep 14 17:39:57 2013
List of video drivers:
	chips
	openchrome
	intel
	mga
	vmware
	siliconmotion
	tseng
	ati
	mach64
	ark
	radeon
	trident
	i128
	nouveau
	vboxvideo
	sis
	tdfx
	rendition
	s3virge
	cirrus
	r128
	s3
	voodoo
	savage
	apm
	neomagic
	sisusb
	fbdev
	vesa
(++) Using config file: "/root/xorg.conf.new"
(==) Using system config directory "/usr/share/X11/xorg.conf.d"
(II) [KMS] No DRICreatePCIBusID symbol, no kernel modesetting.
(II) GPU only supported with KMS, using vesa instead.

Backtrace:
0: Xorg (xorg_backtrace+0x36) [0x7f79fb987d06]
1: Xorg (0x7f79fb809000+0x182859) [0x7f79fb98b859]
2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f79fab31000+0xf030) [0x7f79fab40030]

Segmentation fault at address (nil)

Fatal server error:
Caught signal 11 (Segmentation fault). Server aborting


Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
Please also check the log file at "/var/log/Xorg.0.log" for additional information.

Server terminated with error (1). Closing log file.
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