* Only able to get 4 monitor system running as far as possible (except span application window between cards) by setting PCI card as primary Video default in BIOS (auto didn't seem to work correctly)
* Radeon error upon boot-up: ACPI* When enabling xinerama (i.e. In "Server Layout: '''Option "Xinerama" "1"''' ),screen 1 is mirrored, and does not allow mouse pointer to move to other card (although other card's monitors span correctly. Background picture shows in screen 1, but only background colour displays in screen 0).* '''Radeon error''' upon boot-up: '''error during ACPI method call''' Additional information from '''grep radeon /var/log/messages''': Nov 18 22:03:56 studio kernel: [ 17.111500] [drm] radeon defaulting to kernel modesetting.Nov 18 22:03:56 studio kernel: [ 17.111505] [drm] radeon kernel modesetting enabled.Nov 18 22:03:56 studio kernel: [ 17.111570] radeon 0000:01:00.0: enabling device (0000 -> 0003)Nov 18 22:03:56 studio kernel: [ 17.111580] radeon 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16Nov 18 22:03:56 studio kernel: [ 17.261545] radeon 0000:01:00.0: VRAM: 256M 0x00000000 - 0x0FFFFFFF (256M used)Nov 18 22:03:56 studio kernel: [ 17.261549] radeon 0000:01:00.0: GTT: 512M 0x10000000 - 0x2FFFFFFFNov 18 22:03:56 studio kernel: [ 17.261663] radeon 0000:01:00.0: radeon: using MSI.Nov 18 22:03:56 studio kernel: [ 17.261692] [drm] radeon: irq initialized.Nov 18 22:03:56 studio kernel: [ 17.330580] [drm] radeon: 256M of VRAM memory readyNov 18 22:03:56 studio kernel: [ 17.330583] [drm] radeon: 512M of GTT memory ready.Nov 18 22:03:56 studio kernel: [ 17.332863] [drm] radeon: 1 quad pipes, 2 z pipes initialized.Nov 18 22:03:56 studio kernel: [ 17.348456] [drm] radeon: ring at 0x0000000010000000Nov 18 22:03:56 studio kernel: [ 17.348699] [drm] radeon: ib pool ready.Nov 18 22:03:56 studio kernel: [ 17.790148] fb0: radeondrmfb frame buffer deviceNov 18 22:03:56 studio kernel: [ 17.790227] [drm] Initialized radeon 2.5.0 20080528 for 0000:01:00.0 on minor 0