Dual-head on Fedora 11

I finally have a working dual-head configuration on Fedora 11 with a Radeon 2600 Pro AGP card and two LCD monitors.  The ATI Catalyst (fglrx) binary-only driver is crashing again; I think they’ve had a regression in their AGP support for the R600 GPUs.  Getting dual-head to work with the X.org radeon driver was interesting as I had to find bits and pieces of relevant information all over the place.  To make a long story short, you have to create an /etc/X11/xorg.conf file, because Fedora no longer creates on by default (it’s unnecessary for simple configurations), then edit it to add the second head.

One of my monitors has a native resolution of 1600×1200, and the other 1920×1200.  The X server for no apparent reason defaults to 1600×1200 on both.  I tried adding a modeline for the larger monitor, but it didn’t do anything.  Finally I found the PreferredMode option in the xorg.conf man page, and that did the trick.  My xorg.conf is below.


# Xorg dual-head configuration
# monitors: Samsung SyncMaster 213T and Dell 2405FPW
# card: Visiontek Radeon HD 2600 Pro 512MB AGP (RV630)
# Eric Smith
# $Id: xorg.conf,v 1.1 2009/09/18 10:03:47 eric Exp eric $

Section "ServerLayout"
	Identifier     "Default Layout"
	Screen      0  "Screen0" 0 0
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "InputDevice"
# keyboard added by rhpxl
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option	    "XkbModel" "pc105+inet"
	Option	    "XkbLayout" "us"
EndSection

Section "Device"
	Identifier  "Videocard0"
	Driver      "radeon"
	Option	    "monitor-DVI-0" "Dell"
	Option      "monitor-DVI-1" "Samsung"
EndSection

Section "Monitor"
	Identifier "Dell"
	# Dell 2405FPW
	# Without the PreferredMode option, the X server
	# decides to use 1600x1200.
	Option "Preferredmode" "1920x1200"
EndSection

Section "Monitor"
	Identifier "Samsung"
	# Samsung SyncMaster 213T
	# The PreferredMode option doesn't seem to be
	# necessary here, as the X server picks
	# 1600x1200 on its own.
	# Option "Preferredmode" "1600x1200"
	Option "LeftOf" "Dell"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Videocard0"
	Monitor "Dell"
	DefaultDepth     24
	SubSection "Display"
		Viewport   0 0
		Depth     24
	EndSubSection
EndSection
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One Response to Dual-head on Fedora 11

  1. Pingback: More trouble with Radeon HD 2600 Pro AGP at What’s All This Brouhaha?

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