[clug] Xinerama with a Radeon mobile chipset

[Michael Still]

Hey follks,

I have a quite nice ThinkPad. It has a Radeon Mobility video card in it, 
which has an external video oriface. I assume that I can drive this 
separately from the internal LCD monitor -- I haven't tried yet with 
Windows. An lspci says:

0000:01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R250 
Lf [Radeon Mobility 9000 M9] (rev 02) (prog-if 00 [VGA])
         Subsystem: IBM: Unknown device 0531
         Flags: bus master, stepping, fast Back2Back, 66MHz, medium 
devsel, latency 66, IRQ 11
         Memory at e0000000 (32-bit, prefetchable)
         I/O ports at 3000 [size=256]
         Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
         Capabilities: [58] AGP version 2.0
         Capabilities: [50] Power Management version 2

What I want is to be able to use the latop dual head with an external 
monitor, but also quickly and easily swap back to having the external 
monitor display the same thing as the internal monitor for presentations 
(at 1024x768). All the xinerama stuff I find on the web seems to be 
aimed at people with two video cards.

I'm an XFree gumby, although I can't imagine this is too hard to do. Has 
anyone got something close to a canned config, or hints that they would 
like to share?

Cheers,
Mikal

-- 

Michael Still (mikal at stillhq.com) | "All my life I've had one dream,
http://www.stillhq.com            |  to achieve my many goals"
UTC + 10                          |    -- Homer Simpson