When receiving a phonecall screen not light up

[ddr2]

Hello, I'm facing a problem with my Z5 (latest update installed). Sometimes, when I receive a phonecall , sxreen remains black for a few seconds (3-4, maybe 5) which is very annoying.

Seems like my phone can't wake up from deep sleep. Any solutions? I have done a sw repair, but it didnt help. 

[gregoryopera]

Is there anything blocking the proximity sensor (near the earpiece), @ddr2?

Also try running your smartphone in Safe Mode for a bit, and see if the problem still occurs...

[ddr2]

My phone is Sony Z5 , using the laters 7.1.1 sw (32.4.A.1.54).

Proximity sensor has nothing to do with my problem, because my problem is NOT during a phone call but it is when my phone is ringing because I' m receiving a phone call. Phone is ringing, vibration is working, but the screen takes a while to light up. (4-5-6 seconds). Very very annoyning!!! Not always happens! 

 *proximity sensor is not blocked anyway.... I think it is a sw bug.

[gregoryopera]

Does it happen when your smartphone is running in Safe Mode, @ddr2?

[ddr2]

Haven't try that yet, because the problem occurs occasionally.

[gregoryopera]

Safe Mode is a pain, but try it for a day or so and see if you still have the problem, @ddr2... Well at least until you get a couple of incoming calls, anyway.

Then post back here and let us know how you went...

[NeoBeum]

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@ddr2 wrote:

Hello, I'm facing a problem with my Z5 (latest update installed). Sometimes, when I receive a phonecall , sxreen remains black for a few seconds (3-4, maybe 5) which is very annoying.

Seems like my phone can't wake up from deep sleep. Any solutions? I have done a sw repair, but it didnt help. 

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Hi, there's one setting I recommend checking and turning off before fault finding this problem and it's "Power Button ends call" in SETTINGS»Accessibility

This enables you to force backlight to turn on during calls without ending the call.

From here, isolating the problem is much easier

also

add every system app to battery optimisation for now, but mainly:

anything to do with Qualcomm, backlight, adaptive brightness and the codeaurora

there's some bugs that Google introduced when they turned quick settings to inconvenient settings

use this as a rough guide.

/t5/Xperia-Z5-Z5-Compact-Z5-Premium/wifi-hotspot-stoped-working/m-p/1279424#M41899

If you guys don't believe me about the UI bugs, I will post a video.