strange HDMI output trying to use Debian with GMA500 Poulsbo

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http://www.linuxquestions.org – Hello there, (i hope this is the right forum for..) I run Debian on a little server with HDMI output and this configuration (below) When i connect my TV (HD) as screen, it displays the output in an rectangle in the upper left corner (2/3 of the screen), xrandr is saying that it can only display 1024*768. The rest of the screen is filled with nonsense, seems like old data that have been left in the framebuffer? I would post a picture here but i think is not wanted..) I just would like to set the graphics to HD resolution (1920x1050?) - but no luck, because it is the "unloved" GMS500 (HowTos)