radeon 9000 (rv250) dvi 1920x1200 troubles

[Alex Deucher]

On Tue, May 13, 2008 at 12:26 PM, Andre Puschmann
<andre.puschmann at stud.tu-ilmenau.de> wrote:
> Alex Deucher wrote:
>  > On Tue, May 13, 2008 at 11:08 AM, Andre Puschmann
>  > <andre.puschmann at stud.tu-ilmenau.de> wrote:
>  >> Alex Deucher wrote:
>  >>  > (II) RADEON(0): Modeline "1920x1200"x60.0  154.00  1920 1968 2000 2080
>  >>  > 1200 1203 1209 1235 -hsync +vsync (74.0 kHz)
>  >>  >
>  >>  > the problem is you are using xserver 1.3 which had a bug when parsing
>  >>  > sync polarity from edid.  the sync polarities are reversed and many
>  >>  > LCDs don't like that.  try the following modeline:
>  >>  > Modeline "1920x1200R"  154.00  1920 1968 2000 2080  1200 1203 1209
>  >>  > 1235 +hsync -vsync
>  >>  >
>  >>  > xrandr --newmode "1920x1200R"  154.00  1920 1968 2000 2080  1200 1203
>  >>  > 1209 1235 +hsync -vsync
>  >>  > xrandr --addmode DVI-0 "1920x1200R"
>  >>  > xrandr --output DVI-0 --mode "1920x1200R"
>  >>  >
>  >>  > Check to see if your distro provides a patch to fix that or upgrade to
>  >>  > a newer xserver.
>  >>  >
>  >>  > Alex
>  >>
>  >>  Thanks for your prompt reply.
>  >>  Unfortunately this doesn't work either. I already tried this settings as
>  >>  this was one of the modelines I found with google.
>  >>
>  >>  I also tried the newest Ubuntu Live-CD with the same results (xserver
>  >>  1.4). But I will check again, if this version auto-detects the edid
>  >>  values correctly.
>  >>
>  >>  And even worse, my monitor doesn't provide any error output. I just
>  >>  stays black.
>  >>
>  >>  Maybe this problem is really because my video card can't provide the
>  >>  right signal?
>  >>  Is there anybody out there who runs a radeon 9000 with a resolution of
>  >>  1920x1200px?
>  >
>  > Can you try the VGA port rather than the DVI port?
>
>  Sure,
>
>  the VGA port works with the above settings.
>  But in my opinion the signal isn't very good, it looks a bit blurry.
>
>  Maybe that helps to isolate the problem.

Perhaps the monitor doesn't like the bios provided TMDS PLL, does this
option help (assuming your driver is new enough):
Option "DefaultTMDSPLL" "TRUE"

Alex