asked 2019-11-11 15:33:57 +0200
Since upgrading to 3.2.0.12/Torronsuo, my Xperia X now has a noticeable delay when reacting to pressing the power button. Both waking up and turning off the screen takes at least half a second before anything visible happens. This is especially apparent when turning off the screen, where I press the power button and the screen remains on for what feels like an eternity.
answered 2019-11-11 20:41:59 +0200
I noticed the same thing. And for my Xperia X, it helped to apply the code from the release notes under the Phone section
mcetool --set-ps-on-demand=disabled.
I had no more delay after that, if I lock the phone via the top menu.
[Edit - 12.11.19 - converted to an answer]
Note that the delay is directly related to "on-demand" proximity sensor setting. Sensor is kept powered off unless the phone is in a state the sensor state is constantly needed i.e. things like ongoing call -> proximity blanking is needed -> sensor is powered up. Then there events/impulse kind of things that require knowledge of p-sensor state -> processing of such events is delayed until sensor state is known -> reacting to things like power key presses is affected by sensor ramp-up time.
This feature was implemented as a workaround for xa2 p-sensor starting to malfunction after being powered on for long time.
It was taken also in use for Xperia X in the hope that it might fix some problems people were having with in-call proximity blanking.
Also noteworthy: Power key is a special case, but is currently not treated as such i.e. under some circumstances processing of power key events would not require knowledge of p-sensor state -> delaying power key processing is not always necessary. An internal task exists for this purpose, but it is not considered high priority.
spiiroin ( 2019-11-13 10:13:03 +0200 )editAsked: 2019-11-11 15:33:57 +0200
Seen: 509 times
Last updated: Nov 12 '19
Same here on Xperia X and 3.2. It's an annoyance.
tmy ( 2019-11-11 15:41:50 +0200 )editSame applies to using lock icon from top menu.
potski ( 2019-11-11 16:29:15 +0200 )editYeah, sometimes I pressed a second time already, because phone has not reacted. Maybe someone skilled can make a patch?
SaimenSays ( 2019-11-11 18:56:30 +0200 )editI think iPhone had this sort of update in the past: they slowed down the older models too. 😄
potski ( 2019-11-11 19:52:10 +0200 )editIt seems that only Xperia X is affected by this issue. Though, no problems here on XA2
Sakke ( 2019-11-12 07:26:52 +0200 )edit