[bug][jolla-tablet] Half of the touch screen becomes less responsive after extended use

asked 2016-05-12 11:47:00 +0300

wheelybird gravatar image

I'm having a problem with the Jolla tablet which seems to be software rather than hardware. The issue is that half the touch screen (the top half) becomes less responsive to touch after you've been using the tablet for a while. A reboot of the tablet fixes it (for a while).

For example, if you install the Paint application and slowly draw horizontal lines (in portrait orientation) I see loads of gaps where the screen didn't register the touch. In fact, it's more gap than line. As you get further down the screen it improves, and below halfway the lines are solid.

I can't work out what triggers the drop in responsiveness, but I tend to notice it especially when exiting from an Android app.

I hope this is a software issue as I doubt I'd get a replacement tablet under warranty. :D

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Just an idea, rotate it so it goes into landscape mode. Does that change anything? Assuming the paint app supports landscape.

ozzi776 ( 2016-05-12 11:50:26 +0300 )edit

@ozzi776 I did try that with the same results; patchy response on the affected half.

wheelybird ( 2016-05-12 11:57:01 +0300 )edit

Could be a hardware issue as in the upper part behind the screen sits the whole mainboard including the Atom SOC. I fear it might be overheating. Is the display hot at those spots ?

leszek ( 2016-05-12 17:01:23 +0300 )edit

@leszek I haven't noticed any hot spots, but I'll check more carefully the next time it happens. I wonder if a reboot allows the SoC to cool down enough to return to normal? This would also fix in with my impression that Android apps cause the issue; I'm sure they're the ones that would cause the CPU to run hot.

wheelybird ( 2016-05-12 17:14:06 +0300 )edit

@wheelybird for the jolla phone there is a app to monitor the cpu temp, not sure if it works for the atom cpu.. might be worth a try. I don't think a reboot would be enough time to cool down.

ozzi776 ( 2016-05-12 19:36:03 +0300 )edit