I recently installed Fedora Core 4 on my computer in a dual-boot setup with WinXP and I'm having trouble getting my second monitor to work.

The machine is one of those VPR Matrix from Best Buy, with a P4 1.6 chip on a D845BG motherboard with 512MB of RAM. Video card 1 is in the AGP slot, and it's an ATI All-In-Wonder Radeon 9000 card. After getting the Linux drivers from ATI, it and the attached Samsung 753df monitor work fine. The second monitor, a Hitachi CM620 (acutally, it's a MC6215, but when I look for drivers for it, I keep ending up with these CM620 drivers), it attached to a an old (can't remember the brand, but I bought this years ago as an upgrade to a Compaq machine...I bought the card in 1999) el-cheapo Permedia 2 card that's in a PCI slot.

The problem I have is that the second monitor isn't working. Fedora has drivers for both the cards installed, but when I do into System Settings>Display and try to tell it to use the Permedia 2 card to run the Hitachi monitor, it says the changes were saved, but it doesn't actually save the changes in the xorg.conf file. It keeps trying to use the ATI card for the monitor. Yes, I have the box checked for "use dual head".

Any help would be appreciated. I remain a newbie at this Linux thing, but I'm getting better...

Have you tried to edit xorg.conf manualy?

I have a similar setup with two Nvidia cards. Make sure that the BusID's are correct for each device in you xorg.conf file. If you shutdown the X server, log on as root and use the command 'X -configure'. It will generate a basic config file that you can use to get the correct BusID's.