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

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        erich@(mucl.de|debian.org)        --        GPG Key ID: 4B3A135C
        A polar bear is a rectangular bear after a coordinate transform.
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                    Der Wissende weiß, dass er glauben muß.

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