Problems using 1920x1080 on a 965 with the Intel driver

[Alan Hourihane]

On Fri, 2007-12-14 at 10:07 +0000, Simon Farnsworth wrote:
> Alan Hourihane wrote:
> > On Thu, 2007-12-13 at 15:10 +0000, Simon Farnsworth wrote:
> >> We're trying to drive a Samsung LE40M87BDX/XEU 1080p LCD TV with an
> >> Intel 965Q and the xf86-video-intel driver, on Fedora 8.
> >>
> > It's probably the the driver is trying to drive your TV with that 173Mhz
> > pixel clocked 1920x1080 at 60Hz mode instead of the 1920x180 at 59.9 with a
> > 138.5MHz clock.
> > 
> > I'm pretty sure most TV's will want the "Reduced blank" version.
> > 
> > So if you force the Xserver to use that alternative mode, you should be
> > o.k.
> > 
> > Alan.
> 
> Allowing the driver to use DDC makes it work, so I suspect your "reduced
> blank" hunch is right. How do I generate a modeline with "reduced blank"?
> 
> The reason we have to do this with a modeline is that we connect our
> displays using VGA extenders and splitters that don't pass DDC to
> connect multiple identical displays to one box.

The 1920x1080 mode you already have with the 138.5MHz pixel clock is
already the "reduced blank" mode. You just have to make sure that the
173MHz pixel clock mode is removed, or you change the name of the
138.5MHz clock to something like 1920x1080R and force that in your
selection.

Alan.