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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