[clug] Xinerama with a Radeon mobile chipset

Geoff Smith gsmith at geoffco.net
Thu Jul 1 05:28:52 GMT 2004

I've got the same card in my dell 600m. By default it seems to output a 
clone of the LCD. When I'm plugged into a projector I knock the res down 
to 1024x768 and it works happily enough. I don't know about the dual 
head  -- although now that you've mentioned it I might start playing...



Michael Still wrote:
> 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

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