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List:       linux-fbdev-devel
Subject:    Re: [Linux-fbdev-devel] Dual screen framebuffer development advice
From:       "Antonino A. Daplas" <adaplas () hotpop ! com>
Date:       2004-11-22 22:14:03
Message-ID: 200411230614.03946.adaplas () hotpop ! com
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On Tuesday 23 November 2004 05:35, Andrew Walrond wrote:
> I asked this a few months ago:
>
> On Saturday 19 Jun 2004 21:25, Antonino A. Daplas wrote:
> > On Saturday 19 June 2004 21:55, Andrew Walrond wrote:
> > > I need to setup a machine to develop a framebuffer based application.
> > > I'd like to use two graphics devices; The first an ati agp chipset on
> > > the motherboard which will run X11 with X11's ati driver, the second a
> > > PCI card running a fb driver and displaying my framebuffer application.
> > >
> > > Is this possible/sensible?
> >
> > Sure, it's possible and actually not hard to do.  Just make sure that the
> > driver of your primary card is fbdev, and the secondary X11.  X happens
> > to do a fine job of initializing non-primary cards whereas fbdev is
> > mostly restricted to cards initialized by the firmware.
>
> I've got this working nicely now. I have a recent agp nvidia card and an
> old pci matrox millenium in this dual opteron machine running 64bit linux.
> I boot into a console on the matrox using the built-in matroxfb driver,
> then startx which runs on the nvidia card using the nv driver. I can then
> work on my fb application in X, viewing the output on the second monitor
> via the matrox card. Nice!
>
> > Note: You wont' be able to see both displays simultaneously, switching
> > from one blanks the other.   If you do want multi-seat, see the Ruby
> > project of linuxconsole.
>
> This is wrong; I can indeed see both displays simultaneously :)

That sounds very nice :-).  So I was wrong.  I probably should have said
that you cannot display multiple consoles simultaneously.

Tony




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