1) DEB_BUILD_OPTIONS="nostrip debug noopt" apt-get --build source xf86-input-tslib
2) DEB_BUILD_OPTIONS="nostrip debug noopt" apt-get --build source xserver-xorg-video-fbdev
3) gdb --args X :0 vt4
4) break ReadInput
5) break FBDevPointerMoved
6) touch the corner nearest to the "n" of "neo"

$6 = {x = 63, y = 581, pressure = 1, tv = {tv_sec = 1218899749, tv_usec = 202602}}


$7 = {x = 581, y = 417, pressure = 1, tv = {tv_sec = 1218899749, tv_usec = 202602}}

x = 639 y = 312

newX = 167 newY = 639


(hardware)
[rotate CW output of tslib]
<input of fbdev>

(0,0)         (480,0)
[0,480]          [0,0]
<0,480>



[640,480]      [640,0]
(0,640)      (480, 640)


       "neo"


fbdev:

in the corner we get 640,357