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Sailfish X, screen flashes when speaking on phone [released]

asked 2017-10-20 13:02:35 +0300

lumen gravatar image

First I thought I was imagining, but now I saw it clearly on couple of phone calls.

When speaking on phone and phone on the ear, the screen seems to flash on and off every ... maybe 5 seconds. It's a bit annoying. Did never happen while I had the phone (Xperia X) still with Android (3 months).

Has others had this problem too?

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The question has been closed for the following reason "released in a software update" by lumen
close date 2018-07-30 20:39:29.567651


I did not see the screen flashing, but something similar does bother me. Sometimes, the phone call just stops, sometimes the call goes on hold. I think the screen is reacting to my ear, and I pull the top menu down (On hold) or the bottom menu up (End call).

rob_kouw ( 2018-02-06 12:00:12 +0300 )edit

Actually flashing may be a wrong wording from me. I get very weird behaviours sometimes when screen turns on. Often the loudspeaker turns on which is breaking ears. Sometimes the call gets "parked" and the friend disappears from the other end. This is only because the screen turns on although the phone is tightly towards the ear. So, I strongly believe we have the same issue here.

lumen ( 2018-02-18 11:45:37 +0300 )edit

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answered 2018-02-23 13:27:19 +0300

spiiroin gravatar image

When there is an active call, display is turned off when proximity sensor reports "covered" (= phone at ear) - and powered on when "not-covered" is reported by the sensor (= phone taken away from ear).

What you describe sounds bit like something that could be resulting from misbehaving proximity sensor and/or holding the phone at ear in such way that the sensor is only partially obscured.

There is a p-sensor test in the CSD app, you might want to check if yours is working as expected.

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The test is fine, even with the hand at almost 1cm of distance. But during calls the screen is definitely turning on regularly. I have taken the habit to keep the phone away from my cheek. We'll see if it's better in 2.1.4

Sthocs ( 2018-02-23 17:20:49 +0300 )edit


This type of proximity sensor can easily be fooled by hair. Even if the device is burried in hair, the sensor may report false negative (not covered) because hair does not reflect the IR light back to the sensor the way your hand would.

The opposite thing may happen when you are using your phone in bright sunlight. In that case the IR from Sun fools the sensor. It is rare though because the ambient light sensor easily filters this out. But still there are strange cases when this bappens.

LVPVS over.

LVPVS ( 2018-02-24 08:10:08 +0300 )edit

@Sthocs there have been no changes in this so, I'd be surprised if upgrade changes anything. However regular (as in there is some more or less stable frequency) wakeups sound rather odd/interesting. Any chance that you could get journal from such period (all display wakeup reasons should be logged).

spiiroin ( 2018-02-24 19:00:47 +0300 )edit

I apologize for my stupidity, but what is "CSD app"? :-) I could try it out, what it says.

The problem "happened" to start when I flashed the phone from Android to SFOS X. I never witnessed any problem of this kind with Android. Of course it could be that sensor has gotten crazy by its own and has not much to do with flashing, but feels a bit too much of a coincidence...

Well, one can live with this problem. But sometimes it's irritating when calls get parked every now and then. And sometimes it's not so funny when loudspeaker goes on while on the phone...

lumen ( 2018-02-24 22:59:10 +0300 )edit

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Asked: 2017-10-20 13:02:35 +0300

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Last updated: Feb 23