I have an IBM T42(type 2373) laptop, which has only one VGA output port. In order to use two external monitors I bought a PortReplicatorII(74P6733), which has one DVI-D(Single Link) output and one VGA output. Two external monitor setup should be fine according of friend of mine(Windows user), this quote "When both VGA and DVI ports are used, the laptop's built-in monitor is disabled."
and Googling. I have Radeon 7500 graphics card:
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500] (prog-if 00 [VGA controller])
Subsystem: IBM ThinkPad T42 2373-4WU
Flags: bus master, stepping, fast Back2Back, 66MHz, medium devsel, latency 66, IRQ 11
Memory at e0000000 (32-bit, prefetchable) [size=128M]
I/O ports at 3000 [size=256]
Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
[virtual] Expansion ROM at c0120000 [disabled] [size=128K]
Capabilities:  AGP version 2.0
Capabilities:  Power Management version 2
Kernel modules: radeonfb
However, how to configure this extended-desktop setup under Linux. I use Suse 11.1(KDE, 220.127.116.11-0.1-default)? Is there a way doing this using xorg.conf(so it will be desktop environment independent)?