On Mon, 2007-04-30 at 18:52 -0700, Vitaliy wrote:
> Jake Anderson wrote:
> > Something sounds fishy to me.
> > I have an old AGP gfx card driving my 37" LCD @ 1920x1080x50Hz , in linux.
> > I had to turn all the EDID stuff off because the screen insisted that it
> > could only do 1024x768.
> >
> > A single DVI cable is able to push to about 1920x1080x74.99999hz I
> > believe, you can probably trade the Hz for resolution though.
> >
> > If you are using windows I believe the tool you want is powerstrip, it
> > lets you bugger around with pretty much anything.
> 
> Thanks for the suggestion, but I would prefer not to trade refresh rate for 
> resolution.

At the resolution you're interested in I agree that dropping the refresh
is not an option. Generally, there is no reason to go above 60Hz on an
LCD, due to the way they display higher refresh rates won't be noticed,
but going much below 60Hz is also not that great an idea.

In case anybody wants numbers to determine what's "supported" by a
single DVI link:

max pix-clock rate: 165MHz
So, to figure out your pix clock, take the resolution:
2560x1600 = 4096000pixels x refresh(60Hz) = ~245Mpixels/sec

On top of that add about 20-30% (even more depending on resolution) for
front porch, back porch, retrace, etc:
~ 330Mhz, clearly too much for a single link.

The funny thing is most video cards these days have 400MHz RAMDACs, so
if your panel supports VGA-in you can hook that up instead. If you've
got a good video card the display will look pretty much as good as the
DVI-in does, assuming you've got a good cable, and the monitor is well
designed to accept high resolution analog inputs (not always the case).

TTYL

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