Dual Head, 8bpp and Centos 5 problem

Neil Thompson abraxis at metroweb.co.za
Sun Jun 22 23:29:26 PDT 2008

On Fri, Jun 20, 2008 at 09:47:46AM -0400, Alex Deucher wrote:
> On Fri, Jun 20, 2008 at 4:32 AM, Neil Thompson <abraxis at metroweb.co.za> wrote:
> > Hi all,
> >
> > I have a legacy app which only runs in 8bpp that I have to
> > get working on a CentOS 5 platform (xorg-x11-server-1.1.1 +
> > Red Hat patches).  The app requires dual head, non cloned
> > displays.
> >
> > The problem is that I cannot get X to come up in dual head
> > mode when the DefaultDepth is set to 8.  Other depths (16 and
> > 24) work fine, but when I change the DefaultDepth to 8, both
> > screens display their built-in made change message, but only
> > the primary (I assume) screen is initialised properly (the "X"
> > comes up on it and I can move it around).  When I try to move
> > the cursor to the other screen, it just disappears.  This is
> > with the mga driver and a dual DVI card (hardware is fixed -
> > I have to use it).
> My rusty recollection is that 8 bpp is not possible on crtc 2 (hw limitation).

That's just what I didn't need to hear :-{

Do you have any recollection whether that's just on the mga driver, or just on
dual dvi cards or anything like that?

In other words, is there any way I can get 2 8-bit displays up?

Cheers! (Relax...have a homebrew)


...aliquando et insanire iucundum est.
                           -- Lucius Annaeus Seneca

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