Touchscreen issue

[4ur0r]

My Mi5s Plus has a strange touch screen behaviour: when I tap something and then slowly release my thumb from the screen, the touch screen seems to "feel" my finger until I move it 1-2 millimiters away from the glass. Basically, the touch screen works even if my finger isn't touching physically the glass, but only after touching the screen first (kinda like the glove mode on some Samsung phones, but not really).
That behaviour is really annoying especially scrolling because it feels like I'm scrolling "too much" because of the higher sensitivity my touch screen has.

I've tried both SGS Touch Screen Booster and editing the build.prop file adding this:

debug.performance.tuning=1
windowsmgr.max_events_per_sec=200
view.touch_slop=2
view.scroll_friction=1.5
view.minimum_fling_velocity=25
ro.max.fling_velocity=12000
ro.min.fling_velocity=8000
ro.min_pointer_dur=8
touch.size.calibration=geometric
touch.size.scale=100
#touch.size.bias=70
touch.pressure.calibration=amplitude
touch.pressure.scale=0.3

and tweaking values, but nothing seems to change.

I'm using LineageOS (latest release) right now, but I experienced this "bug" on MIUI too, although I haven't tried the latest release.
Hope somone can help me!
Kind regards

EDIT: for whatever reason, the behaviour occours even on recovery (TWRP) so I guess it's an hardware issue

 

[khanjui]

Sadly, it's probably a hardware issue as you assumed. You may try to check the connection cables.