I'm trying to set up a triple-head configuration using an ATI X1300/X1550 (RV515) workstation card (ID 1002:7183) alongside my motherboard's integrated Intel HD 2500 (ID 8086:0152).Thus far, my efforts have produced an old-style isolated setup, with the ATI card running two displays at :0.0 and the Intel chipset running the 3rd display at :0.1.I believe this is not a hardware problem, as I've managed to get a Xinerama setup working and subsequently drag an Xterm across all three displays.However, as my displays are different sizes, the process of dragging the window was sufficiently hilarious that I won't be able to use such a configuration.I'm looking to configure a unified X setup that presents a single :0 that spans all three displays.I'm currently using the radeon driver for the ATI card. I've also tried using the modesetting driver for both the Intel and ATI GPUs, which actually worked perfectly, DRI and all, but sadly also with separate :0.0 and :0.1 screens. :(This is on Arch Linux, so Xorg et al are fairly up-to-date.
Running a unified X display across two separate video cards
xorg;xrandr;multi monitor;intel graphics;ati