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Hi!
I have Sony Xperia P with latest ICS version (but I had this lag in GB).
When I answer a call and positioning phone in horizontal - proximity sensor doesn't work. But when phone in other positions (vertical, non-horizontal) - everything is OK. I think proximity sensor works with gyro sensor (why???). I also checked it in Galaxy Nexus - it's OK, proximity sensor works in all positions.
PS: Also checked Xperia Neo V - it has this bug.
do you have anything covering the proximity sensor? a film protector or a protecting case?
No. All phones doesn't have screen protector.
have you try the basic, repair it with SUS or PCC ?
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unrelated topic, if you have some time please check this thread
Yes. I do flashing with Flashtool (with full wipe) and PCC. Nothing changed. Does a Sony calling app have checks of proximity sensor and gyro sensor together or it's checks only proximity sensor? I ask this question cause Xperia Neo V proximity sensor works identically.
test it with Service Menu
http://talk.sonymobile.com/thread/24534
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unrelated topic, if you have some time please check this thread
Proximity sensor working OK. Only in calling app in horizontal position - proximity sensor doesn't work (or detection rate is low). Does calling app have gyro sensor checks?
that's odd, repair your phone with SUS and check again
Update Service (SUS)
http://www.sonymobile.com/gb/tools/update-service/
http://www-support-downloads.sonymobile.com/Software%20Downloads/Update_Service_Setup-2.11.12.5.exe
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Don't forget to mark the Correct Answers & Helpful Answers
unrelated topic, if you have some time please check this thread
OK, I'll try.
Also, today I go to mobile phone shops and check Xperia P phones. All phones has this lag.