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[Bug 1477838] Re: Crackling sound after playing audio and suspended

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: Pat McGowan <pat.mcgowan@xxxxxxxxxxxxx>
Date: Thu, 28 Jan 2016 15:52:12 -0000
Reply-to: Bug 1477838 <1477838@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Description changed:

The Meizu MX4 is doing a weird "tic tic tic..." after receive a
notification (from telegram, mail...) and it's suspended.

------

When I press the screen lock button on the MX4 shortly after playing
music or ending a phone call I hear a radio/fuzzy distorted noise coming
from the phone. To make it stop I need to unlock and lock the screen
again but this is not ideal.

-----

When the screen is locked and the playing song is finished and waiting
for a stopped signal, MX4 will do a weird lower sound.

-----

TEST CASE (Thanks to Kamikaze)
1. Boot the device and wait until it suspends (black screen)
2. ssh to the device
3. Run from the command line:
$ aplay /usr/share/sounds/alsa/Front_Left.wav
4. Repeat step 3 until you reproduce the issue (3 to 5 times)

--- Original Case ---
How to reproduce (Note this does not always work, the phone needs to be in some specific state yet to be determined)

Ensure MX4 is not plugged into USB
Call the MX4 and hear the ringtone
Dismiss the call
Push the power button to turn off the screen
Tick Tick Tick
Push the power button to turn on the screen
hissing
Push the power button to turn off the screen
Tick Tick Tick
etc

It will not clear until you play another sound
Does not happen in silent mode of course

------from the dupe ----

+ Aquaris E4.5
+
Steps to reproduce:

1. Start playing a podcast.
2. Switch to a different app.
3. Lock the screen.
4. Wait for the Podcast to finish.
5. Wait a bit longer.

Expected results:

No noise from speaker.

Actual results:

Soft white noise from speaker. It seems that some part of the audio
subsystem is still switched on. I am concerned that this could be
draining battery.

Workaround:

After the Podcast finishes, unlock the phone and switch back to the
Podbird app. This causes the noise to stop.

Comments:

I noticed the same soft white noise continues a second or two after the
phone plays any sound from any app, but then turns off. I presume there
is some time out turning off some part of the audio subsystem.
Presumably if there is a reason, it should happen even when the app
causing the sound to play is not active.

--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to pulseaudio in Ubuntu.
https://bugs.launchpad.net/bugs/1477838

Title:
Crackling sound after playing audio and suspended

Status in Canonical System Image:
Triaged
Status in pulseaudio package in Ubuntu:
Confirmed

Bug description:
The Meizu MX4 is doing a weird "tic tic tic..." after receive a
notification (from telegram, mail...) and it's suspended.

------

When I press the screen lock button on the MX4 shortly after playing
music or ending a phone call I hear a radio/fuzzy distorted noise
coming from the phone. To make it stop I need to unlock and lock the
screen again but this is not ideal.

-----

When the screen is locked and the playing song is finished and waiting
for a stopped signal, MX4 will do a weird lower sound.

-----

--- Original Case ---
How to reproduce (Note this does not always work, the phone needs to be in some specific state yet to be determined)

It will not clear until you play another sound
Does not happen in silent mode of course

------from the dupe ----

Aquaris E4.5

Steps to reproduce:

1. Start playing a podcast.
2. Switch to a different app.
3. Lock the screen.
4. Wait for the Podcast to finish.
5. Wait a bit longer.

Expected results:

No noise from speaker.

Actual results:

Soft white noise from speaker. It seems that some part of the audio
subsystem is still switched on. I am concerned that this could be
draining battery.

Workaround:

After the Podcast finishes, unlock the phone and switch back to the
Podbird app. This causes the noise to stop.

Comments:

I noticed the same soft white noise continues a second or two after
the phone plays any sound from any app, but then turns off. I presume
there is some time out turning off some part of the audio subsystem.
Presumably if there is a reason, it should happen even when the app
causing the sound to play is not active.

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