[oe] xf86-input-tslib issues after latest version bump to xorg

[Steve Sakoman]

After the recent xorg version bump to 1.7.3 I am seeing functional
issues with xf86-input-tslib.

The ts_calibrate that is run at first boot runs normally, but
touchscreen events are not being passed properly to X.  At first I
suspected bad calibration values, but running ts_test shows quite good
calibration.  Also, the behavior in X doesn't really appear to be
calibration related.  It almost seems that relative rather than
absolute values are being used.

Is anyone else experiencing this?

Steve