resolutions for intel i855GM

[davidek at ipnp.troja.mff.cuni.cz]

Hello,
  ok, I found a way to introduce another mode:
xrandr --newmode 1280x1024 80.14  1280 1344 1480 1680  768 769 772 795
Then I can do xrandr --addmode .... , but I am still not there. The
problems are:
1. I only can issue xrandr --newmode if VGa is not connected, otherwise it
fails
2. when VGA is not connected, setting 1280x1024 works well. Then I connect
VGA and run "xrandr --output VGA --mode 1280x1024". VGA switches correctly
on, but the picture on LVDS gets distorted, all windows get "taller and
narrower", basically it looks differently in this mode compared to the
case when VGA was off. Even issuing again xrandr --output LVDS --mode
1280x1024 does not fix it.

Any idea what to do, please ? My goal is to get the same picture on LVDS
and VGA in order to show slides on external projector.

Thanks for any hint,

 regards
                 Tomas


----------------------------- Původní zpráva -----------------------------
Předmět: Re: resolutions for intel i855GM
Od:      davidek at ipnp.troja.mff.cuni.cz
Datum:   6 Říjen 2007, 23:33
Komu:    "Keith Packard" <keithp at keithp.com>
Kopie:   xorg at lists.freedesktop.org
--------------------------------------------------------------------------

>
> Yes, you can add the 1280x1024 mode to the LVDS output:
>
> $ xrandr --addmode LVDS 1280x1024
> $ xrandr --output LVDS --mode 1280x1024
>
> RandR doesn't really deal with hardware scalers very well; I'm extending
> it to expose a full projective transformation to the user which should
> make it possible to just set the 'native' mode and let the user
> configure whatever pixel size they prefer.

Thanks for the hint, however:
--------
[ipnp-n19] ~ > xrandr --addmode LVDS 1280x1024
xrandr: cannot find mode "1280x1024"
---------
even if I've upgraded to xserver-xorg 7.3 before (Debian sid).... delmode
does not work either. The only command that proceeds is adding an already
existing mode.

Do I need a specific version of xserver-xorg-video-intel ? At the moment I
have 2.1.1-4, I tried also with ~1 month old git version, the same
results. Or do I need another package of specific version ?

Regards
              Tomas


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