you could look at a register dump of the windows drivers and reverse
engineer support.  Also the xfree86 driver makes some references to the
two display pipes, so you may be able to extrapolate support based on
that.  I'm not sure of the status with regards to the i830/45/55/65
parts documentation.  intel has databooks for the i810 on their
website, but that chip only had one crtc.  Do the databooks that the
xfree developers have have the info for the second crtc, or does intel
consider that to be propietary?  You could try asking intel for
databooks...

Alex

--- Brad Hards <[EMAIL PROTECTED]> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On Fri, 29 Aug 2003 00:31 am, Alex Deucher wrote:
> > The following cards have hw dualhead support, but no driver support
> for
> > it:
> > i830/845
> I'm interested in working on this, even if it is just to control the
> second 
> output (ie to make it mirror the main head without having to reboot
> with the 
> external display attached.
> But how does one figure out the right registers to change without the
> 
> documentation? 
> 
> Brad


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