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I'm Running RedHat 8 with XFree and Gnome... I also Installed KDE but I don't really use it. I have a PC Chips M754LR Motherboard with a built-in TNT2 Aladdin. I was recently running Windoze XP and was able to get it to accept a dual monitor setup with the TNT2 and a PCI S3 Trio 32/64 just so long as the Trio was set as the default monitor in the BIOS. (FYI: I have a Daewoo 431X monitor connected to the TNT2 and an MGC Model 1451D-which linux doesn't support- connected to the S3) When I installed Linux however, I found that RedHat8 detected my S3 as an S3 Trio 64 (generic) and I was getting large blocks of color 'bleeding' out of areas, especially when I would drag a scrollbar, So... I was forced to setup the TNT2 as the default... I was just wondering how I can get the S3 to work properly and then how do I set it up as a dual monitor again...???
Then go in and edit that and put in the proper Vert and Horiz settings for your monitors. Linux supports the other one, it just wasn't in that list which does nothing more than provide X with the vert and horiz settings so you don't have to try and track those down by hand.
I haven't set up Dual monitor with RH8 yet, but with 7.3 it's not a big deal to actually config the dual heads. basically you set it up one card & monitor, save the x configuration file off to the side. shutdown, put in the other card, configure the new card/monitor, save the x configuration off to the side. probe the PCI bus to get the PCI bus ID's for each card. merge the two X configuration files (naming the pieces differently in each so they don't collide) and add a section that defines the relationship between the monitors.
Here's my XF86Config file for Dual-Head configuration
Section "Files"
FontPath "unix/:7100"
EndSection
# Module loading section
Section "Module"
Load "dbe" # Double-buffering
Load "GLcore" # OpenGL support
# Load "dri" # Direct rendering infrastructure
Load "glx" # OpenGL X protocol interface
Load "extmod" # Misc. required extensions
Load "v4l" # Video4Linux
# Load "record" # X event recorder
# You only need the following two modules if you do not use xfs.
# Load "freetype" # TrueType font handler
# Load "type1" # Adobe Type 1 font handler
EndSection
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Dual Monitor Setup on RedHat 8
Here's my XF86Config file for Dual-Head configuration
