May i suggest installing the "suggested" software packages for xserver-xfree86 (that is, run "apt-get install discover mdetect read-edid") which are for graphics board detection, mouse detection, monitor detection - then run "dpkg-reconfigure xserver-xfree86" which hopefully will select the correct screen resolution automatically. Else edit /etc/X11/XF86Config-4 and add the real screen resolution of your TFT Display to all color dephts there as first entry.
Greetings, Erich -- erich@(mucl.de|debian.org) -- GPG Key ID: 4B3A135C A polar bear is a rectangular bear after a coordinate transform. Ein Freund ist ein Geschenk, das man sich selbst macht. Der Wissende weiß, dass er glauben muß.