[mythtv-users] Aspect ratio question

[Matthias]

Hello list,

after connecting an hd projector as second display to my frontend, I 
have aspect ratio problems. I hope, somebody here on the list can point 
me to a solution.

I am using a PC with an nvidia graphics card connected via DVI to a 24" 
1920x1080 monitor, everything works nicely.

Then I connect an hd projector to the hdmi output of the graphics card. 
I have configured xorg.conf with nvidia-settings to start this 
configuration as cloned display, the DVI monitor 60Hz, the projector 
50Hz (I am in Europe), sync to the projector.

In this configuration, all my 16:9 tv content will be displayed 
letter-boxed with black bars on top and bottom of the screen, squeezed 
vertically, on both screens. In the preview thumb in the watch recorded 
screen, the aspect ratio is drawn correctly. (There are no black bars in 
the menus, just when a video is played). Also mplayer plays the 
recordings with the correct aspect ratio.

I have to set the aspect ratio in myth to 4:3 to get a correct display. 
If I do this in the video configuration settings, I will get 4:3 
programs streteched vertically, so this is not the solution I am looking 
for.

xdpyinfo shows the same information (1920x1080 pixels, 93x94dpi) in both 
configurations, with and without the projector.

Where do I have to look for a solution for this, has anybody experienced 
the same thing?

Thanks in advance,

Matthias