On 5/9/07, Jeff Stacey wrote: > A quick google turned up this > > http://gentoo-wiki.com/HOWTO_Dual_Monitors#With_the_proprietary_binary_driver > > Newer ati-drivers come with a handy aticonfig script that actually > produces a working dual-head setup. This is the quick-and-easy way. Log > out of X, backup your xorg.conf and run something akin to the following > line: > > # aticonfig --initial=dual-head --dtop=horizontal --screen-layout=right --iagp=off -v > # /etc/init.d/xdm restart > Well, I finally got it working. I don't know how much of this I actually needed to do, but it took this route to get the dual head to work. 1) Recompiled and installed the kernel modules. This was recommended in the above wiki, but before the quoted lines, so I tried it. Since the right config options were already on, this was probably just a waste of time, though semi-informative. 2) Re-ran the ati-driver-installer-8.35.5-x86.x86_64.run program. This probably had no effect to speak of - I didn't notice any. 3) Installed the fglrx64 rpm. This got errors (couldn't find the fglrx module???) but it claimed to be installed, so after removing it and reinstalling it, I left it alone. 4) Went to init level 3 and re-ran the aticonfig program. I ran it once with the above noted dual-head string (except for the --iagp because it complained about that before seg faulting. Then I ran it with --initial only. That seemed to go ok. So I ran it with the --initial=dual-head option (only). Segmentation fault. 5) Saved the xorg.conf file and went in to edit it. It looked liked the below with a few fewer lines (no aticonfig[1] entries at all). I added all the aticonfig[1] entries where they are now, but the desktop horizontal option was not there. 6) Rebooted. 7) X came up with mirrored desktops again. I logged in as root and ran system-config-display (from the gnome menu). it said "Individual desktops" so I changed that to "Spanning desktops"). Saved that (no monitor or video card changes). Then I vi'ed into the xorg.conf file and noticed the first device had the desktop horizontal option turned on. Just in case, I added it to the first aticonfig[0] device, too. Saved a copy of that, just for good measure. Then I logged out. 8) New screen: left screen had the login box, all stretched out. Right screen - the blue background. I logged in as me and now I have spanning desktops (finally) again. Thanks to all, but mostly Jeff Stacey, who hung in there and kept sending me occasional hints. This time, it all fell into place. Here is my current xorg.conf, which seems to work: # Xorg configuration created by system-config-display Section "ServerLayout" Identifier "Multihead layout" Screen 0 "aticonfig-Screen[0]" 0 0 Screen 1 "aticonfig-Screen[1]" RightOf "aticonfig-Screen[0]" InputDevice "Keyboard0" "CoreKeyboard" Option "Clone" "off" Option "Xinerama" "on" EndSection Section "Files" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "kbd" Option "XkbModel" "pc105" Option "XkbLayout" "us" EndSection Section "Monitor" Identifier "Monitor0" VendorName "ATI Proprietary Driver" ModelName "Generic Autodetecting Monitor" Option "DPMS" "true" EndSection Section "Monitor" Identifier "Monitor1" VendorName "Monitor Vendor" ModelName "Generic Autodetecting Monitor" ### Comment all HorizSync and VertSync values to use DDC: HorizSync 0.0 - 0.0 VertRefresh 0.0 - 0.0 Option "DPMS" "true" EndSection Section "Monitor" Identifier "aticonfig-Monitor[0]" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" EndSection Section "Monitor" Identifier "aticonfig-Monitor[1]" Option "VendorName" "ATI Proprietary Driver" Option "ModelName" "Generic Autodetecting Monitor" Option "DPMS" "true" EndSection Section "Device" Identifier "Device0" Driver "vesa" Option "DesktopSetup" "horizontal" BusID "PCI:1:0:0" EndSection Section "Device" Identifier "Device1" Driver "vesa" BusID "PCI:1:0:1" EndSection Section "Device" Identifier "aticonfig-Device[0]" Driver "fglrx" Option "DesktopSetup" "horizontal" EndSection Section "Device" Identifier "aticonfig-Device[1]" Driver "fglrx" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 Modes "1280x1024" "1280x960" "1280x800" "1152x864" "1024x768" "800x600" "640x480" EndSubSection EndSection Section "Screen" Identifier "Screen1" Device "Device1" Monitor "Monitor1" DefaultDepth 24 SubSection "Display" Depth 24 Modes "1280x1024" "1280x960" "1280x800" "1152x864" "1024x768" "800x600" "640x480" EndSubSection EndSection Section "Screen" Identifier "aticonfig-Screen[0]" Device "aticonfig-Device[0]" Monitor "aticonfig-Monitor[0]" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection Section "Screen" Identifier "aticonfig-Screen[1]" Device "aticonfig-Device[1]" Monitor "aticonfig-Monitor[1]" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection -- Mark Hull-Richter DATAllegro (www.datallegro.com) 85 Enterprise, Second Floor, Aliso Viejo, CA 92656 949-680-3082 - Office 949-330-7691 - fax