Bug#798160: Bogus touch events and coords

[Michael Heinemann]

Package: libsdl1.2debian
Version: 1.2.15-10

I'm using pygame to build a touch interface on my raspberry pi. When using wheezy touch events comming from TSLIB are working fine.
example:

TSLIB_FBDEVICE=/dev/fb1 TSLIB_TSDEVICE=/dev/input/touchscreen ts_print
1441449323.448723:    214    130    223
1441449323.459906:    212    129    223
1441449323.459906:    211    129    223
1441449323.478697:    214    129    224
1441449323.488683:    214    130    225
1441449323.488683:    214    130    226
1441449323.498689:    215    131    226
1441449323.508699:    214    132    227
1441449323.528272:    216    142      0

translates to pygame.mouse.get_pos()
(215, 131)

in jessie I get the following.

TSLIB_FBDEVICE=/dev/fb1 TSLIB_TSDEVICE=/dev/input/touchscreen ts_print
1441449458.971298:    241    152    227
1441449458.991297:    241    151    227
1441449459.011300:    244    151    225
1441449459.011300:    245    151    224
1441449459.030912:    259    158      0

translates to pygame.mouse.get_pos()
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(178, 319)
(193, 319)
(193, 319)
(193, 319)
(193, 319)
(193, 319)
(193, 319)
(193, 319)
(193, 319)

So I get many more events from SDL and wrong positions.

When I build libsdl 1.2.15 from source I get the expected behaviour. Also when installing the wheezy package on jessie the coords are correct.

Problem is also described here: https://forums.adafruit.com/viewtopic.php?f=47&t=76169&p=404358