I have a motherboard with RADEON 4200 video. I also have a PCI
card which is RADEON 5450. The video outputs feed two identical
SAMSUNG monitors. At one point I (before version 12), I was able
to run the two monitors as an xinerama display. Once I upgraded
to 12X, only the monitor connected to the motherboard video output
worked. I mucked with xorg.conf, but never got anything to work.
Anyway, after a couple of years of living with only one monitor, I’ve been playing
with xorg.conf file for this again, and I now have the following in my xorg.conf file:
Section “Monitor”
Identifier “SAM0”
VendorName “SAM”
ModelName “SyncMaster”
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
Option “DPMS”
EndSection
Section “Monitor”
Identifier “SAM1”
VendorName “SAM”
ModelName “SyncMaster”
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
Option “DPMS”
EndSection
Section “Device”
Identifier “HD4200”
Driver “radeon”
VendorName “ATI Technologies Inc”
BoardName “Cedar [Radeon HD4200]”
BusID “PCI:1:5:0”
EndSection
Section “Device”
Identifier “HD5450”
Driver “radeon”
VendorName “ATI Technologies Inc”
BoardName “Cedar [Radeon HD5450]”
BusID “PCI:4:0:0”
EndSection
Section “Screen”
Identifier “Screen0”
Device “HD4200”
Monitor “SAM0”
SubSection “Display”
Depth 24
Viewport 0 0
Modes “1280x1024”
EndSubSection
EndSection
Section “Screen”
Identifier “Screen1”
Device “HD5450”
Monitor “SAM1”
SubSection “Display”
Viewport 0 0
Depth 24
Modes “1280x1024”
EndSubSection
EndSection
When I boot the system, the monitor associated with the 4200 board
works and the other remains dead.
I get the following messages in Xorg.0.log about VGA-1 and RADEON(1).
These should be the ones associated with the 5450 board.
47.819] (II) RADEON(1): Output VGA-1 has no monitor section
47.885] (II) RADEON(1): EDID for output VGA-1
47.885] (II) RADEON(1): Output VGA-1 disconnected
Apparently, VGA-0 is set by default to the 4200 display. How do I force
an association of VGA-1 with the 5450 board/monitor section in the
xorg.conf file?
Thanks
Larry