Touchscreen issues

[alexshhadeh]

My device: Surface Pro 7 (Intel Core i7)

Alright so i decided to create my own issue regarding the touchscreen.

The touchscreen works and multi-touch gestures work too. but sometimes when i click on something, it randomly clicks like 3-4 times instead of once, and when i move my finger around the screen, after a few seconds it stops registering my touch for like half a second and then starts detecting it again.

The video below shows both of the issues: i click letter "s" quickly 2 times and it gets written 4 times (instead of 2). After that i click "gh" and that gets written correctly, but then i try again and the result is "ghhh" instead of "gh".
After that i start moving the keyboard window - as you can see, after a few seconds the window stops being moved by my finger, which i assume is because my touch stopped being registered for a split second.

touchscreen.surface.mp4

[balopez83]

@alexshhadeh did you ever replace your screen or remove your screen to replace a battery or ssd or anything? I am wondering if those issues will occur the same under the following separate conditions:

1. plugged in vs. unplugged
2. while the same hand that is touching the screen is also touching the metal of the Surface vs free floating and not touching the frame
3. While the surface is set on a table unplugged with hand free floating and no part of you touching the metal of the Surface vs. the same but plugged in.

Let me know if you notice any difference in each of those scenarios.

While touching quickly can often cause that, it shouldn't if you pull your hand fully away between taps. I suspect you may have a screen ground issue. I have seen similar issues with other Surface devices that have had a screen removed and where certain screen controller boards are not properly attached to the screen resulting in a poor ground of the panel.

Unfortunately i cannot reproduce this touch issue on mine and so I am finding this one hard to troubleshoot as it doesn't seem to be a release or driver issue.

[alexshhadeh]

I've never disassembled this device, but the screen is cracked. With that being said, the touchscreen 100% works on Windows with no issues whatsoever, so I don't think that the crack matters in any way.

1. No difference
2. No difference
3. No difference

"I have seen similar issues with other Surface devices that have had a screen removed and where certain screen controller boards are not properly attached to the screen resulting in a poor ground of the panel." - like i said the screen is cracked so that might be the case. I still find it weird that it works correctly on Windows though.

[cozumii8364]

If I remember correctly I tried blissos on my surface a while back and the touchscreen had similar issues. It may just be the custom os or a problem with iptsd (since blissos also uses that I think)