radeon - How to set up resoluton and frequency?

[Ralf Mardorf]

Hi :)

I need information how to set up the radeon driver for Ubuntu Studio
Precise (and Quantal RC) amd64.
I've got working xorg.confs for Suse and Arch Linux also 64-bit
installs, but until now I can't get it working properly with Ubuntu
Studio.

https://help.ubuntu.com/community/RadeonDriver does link to Arch
Linux :(. So as an example I'll attach my working xorg.conf from Arch,
that doesn't work for Ubuntu Studio.

I still continue trial and error, but perhaps somebody can lead into the
right direction.

[spinymouse at archlinux ~]$ cat /etc/X11/xorg.conf
Section "Module"
	Load  "extmod"
	Load  "dri"
	Load  "dbe"
	Load  "dri2"
	Load  "glx"
	Load  "record"
	Load		"GLcore"
	#Load		"v4l"
EndSection
	Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Plug 'n' Play"
	ModelName    "Plug 'n' Play"
	DisplaySize  305 230
	HorizSync    29-98
	VertRefresh  50-120
	modeline 	"1152x864" 128.42 1152 1232 1360 1568 864 865 868 910
	Gamma	1.0
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "SWcursor"           	# [<bool>]
        #Option     "HWcursor"           	# [<bool>]
        #Option     "NoAccel"            	# [<bool>]
        #Option     "ShadowFB"           	# [<bool>]
        #Option     "VideoKey"           	# <i>
        #Option	    "MergedFB"	"off"           #old debian/ubuntu
	Identifier  "Card0"
        Driver      "radeon"
        #Driver	    "nvidia"
	#Driver	    "nv"
	#Driver     "nouveau"
        #Driver     "vesa"
	#VendorName  "nVidia Corporation"
	#BoardName   "G72 [GeForce 7300 SE/7200 GS]"
	#BusID       "PCI:1:0:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"

	Defaultdepth	24
	SubSection "Display"
		Depth	24
		Modes      "1152x864"
                #Virtual    3840 1200
	EndSubSection

#	SubSection "Display"
#		Viewport   0 0
#		Depth     1
#	EndSubSection
#	SubSection "Display"
#		Viewport   0 0
#		Depth     4
#	EndSubSection
#	SubSection "Display"
#		Viewport   0 0
#		Depth     8
#	EndSubSection
#	SubSection "Display"
#		Viewport   0 0
#		Depth     15
#	EndSubSection
#	SubSection "Display"
#		Viewport   0 0
#		Depth     16
#	EndSubSection
#	SubSection "Display"
#		Viewport   0 0
#		Depth     24
#	EndSubSection
EndSection

If I don't use a xorg.conf with Ubuntu Studio, the vertical frequency is
at 60Hz and maximal resolution is limited to 1024x768. For Arch and Suse
I get >75Hz, resp. =90Hz and the wanted higher resolution. This doesn't
change if I use my Arch's xorg.con with Ubuntu Studio. After editing
this xorg.conf, Ubuntu Studio didn't start X anymore.

Regards,
Ralf