On Wed, 31 Jul 2002 11:05:40 +0200, Berge, Harry ten wrote:
> I'm configuring a dualhead system with two cards: both are Matrox G450, the
> first AGP, the latter PCI.
> Although the configuration utility from SuSE (sax2) totally screws up the
> configuration I can get it to work when I do it by hand. So far so good.
>
> But, I want a clone configuration with 2 screens (actually the second screen
> is a beamer), but it MUST be in pseudo color. The last requirement forces me
> to leave the use of only one G450, because Matrox G450/G550 is not capable
> of displaying pseudo color on the second port.
>
> But is it even possible to use the clone option with to adaptors? Maybe a
> silly question, but I never used it before and I can imagine cloning only
> works for 1 adapter because it is fixed in hardware?!
Somewhen in autumn 2001 there was a commit to CVS, which made G450
cards use clone mode if only one screen specified. And, as I've
discovered, it is a *hardware* clone, not software, i.e. the signal from
1st CRTC is commuted to both outputs. I've checked it by running X in
24+8bpp mode, which isn't supported by 2nd head. Additionaly, when
changing video parameters with xvidtune, both monitors had changed.
I'm not sure if this behaviour is still in effect -- in last tests
I've seen 2nd head blank if only 1st screen specified in config.
BTW, do you run both cards w/o HAL module? And, can you check whether
secondary card's screen(s) remain alive after switch to console and
back?
_________________________________________
Dmitry Yu. Bolkhovityanov
The Budker Institute of Nuclear Physics
Novosibirsk, Russia
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