[pulseaudio-tickets] [Bug 95411] New: Bluetooth 2 latency gets ridiculously high after few hours

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95411

            Bug ID: 95411
           Summary: Bluetooth 2 latency gets ridiculously high after few
                    hours
           Product: PulseAudio
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: core
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: bugs.freedesktop at mailinator.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

Hello,
i have issue with bluetooth speaker. it creates loud pop when it's
(un)suspended by module-suspend-on-idle. so i proceeded to disable
suspend-on-idle, but when i leave it on for few hours, the latency gets huge.
Like 2 seconds or more. I suppose it has something to do with DAC clock (or
samplerate) in bluetooth speakers being little bit slower than nominal. And the
error adds up over time resulting in growing latency.

When i manualy reconnect to speaker it gets fixed.

Do you have any idea how to fix this? I think it needs something that will
reset the stream when no audio is played, pretty much like suspend-on-idle
does, but without powering the bt device off (which causes pop). it's really
annoying. sometimes it scares the crap out of me, when speakers are on full
volume and it pops when i eg. receive IM mesage.  also it's probably not
healthy for the speakers (i use conventional speakers with amp and bt
receiver).

I know the popping is mostly HW error. But it can be worked around by disabling
suspend-on-idle, which then causes latency problems (also somehow HW related).
And i think the latency problem can be somehow fixed in SW by restarting the
stream or cleaning some buffer that causes the latency...

BTW 2 seconds of latency are quite a lot... Is there even chance, that cheap BT
device has 2 second buffer? Maybe it's pulse audio that has 2 second latency.
And it would be easily fixed by not buffering silence. Or by deleting this
buffer when idle.

UPDATE: when i physically disconnect the bluetooth it stops playing
imediatelly, so latency probably originates on laptop side. not in
speaker/receiver. so probably PA's fault.

Any ideas?

See also: [pulseaudio-discuss] bluetooth latency gets gradually worse over time

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