Re: Dual screen framebuffer development advice

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:

quoted

On Saturday 19 June 2004 21:55, Andrew Walrond wrote:

quoted

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!

quoted

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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