2560x1600 display issue. (x11?, nvidia 8800 GTS, hdmi, dvi-d, Dell U3011)

[Linuxguy123]

On Fri, 2011-04-08 at 20:18 -0700, JD wrote:
> On 04/08/2011 08:14 PM, Bruno Wolff III wrote:
> > On Fri, Apr 08, 2011 at 21:05:36 -0600,
> >    Linuxguy123<linuxguy123 at gmail.com>  wrote:
> >> Does the nouveau driver use the xorg.conf file the way the proprietary
> >> driver does, ie does it use modelines ?
> > I use modelines for a monitor that doesn't do EDID (at least not properly)
> > with an NV28 in order to get it to use 1280 x 1024 instead if 1024 x 768.
> Some time ago I had a slightly similar problem,
> but I had no idea how to generate the correct
> modelines, and because I was afraid I would fry
> the monitor :), I did not experiment.

http://www.arachnoid.com/modelines/ give me

# 2560x1600 @ 60.00 Hz (GTF) hsync: 99.36 kHz; pclk: 348.16 MHz
Modeline "2560x1600_60.00" 348.16 2560 2752 3032 3504 1600 1601 1604
1656 -HSync +Vsync

which doesn't agree with the number from the table in the U3011 manual

VESA, 2560 x 1600 98.71 60.0 268.5 +Hsync / -Vsync

I'll try it out as soon as I hear if the nouveau driver is using
modeline in xorg.conf or not.

Aside.  I'm using the KDE display tool in Settings-System-Settings.  It
doesn't display as much information as nividia-settings, but it does
some things (monitor rotation, etc.) better.

What is interesting to me is that I get a different horizontal
resolution (1600 versus 1920) when I use the DVI adapter.  That tells me
the video card is trying to do something different.  Is the driver
supposed to sync up the card to the monitor in the absense of correct
modelines ?

BTW: I thought the 20 inch display on my HDX was high quality.   The
U3011 (running 1920x1600 in 1:1 display mode) blows it away.  Its almost
too sharp and bright.   But that can be adjusted.  The HDX display looks
like trash now.  Dull, faded and fuzzy.