Mixxx startup very slow when bluetooth is on

[mixxxbot]

Reported by: ywwg
Date: 2012-05-15T17:42:17Z
Status: Confirmed
Importance: Low
Launchpad Issue: lp999834

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As part of Mixxx's sound device detection, my bluetooth device gets probed, very slowly, on startup. This delays the appearance of the app by 30 seconds or more. Turning off bluetooth eliminates the problem.

I guess we should somehow blacklist bluetooth audio devices? Here's the relevant output I see:

ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)

[mixxxbot]

Commented by: rryan
Date: 2012-05-15T17:51:38Z

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I spoke w/ the portaudio folks at one point about this and they said that
it's ALSA's fault.

On Tue, May 15, 2012 at 1:42 PM, Owen Williams wrote:

Public bug reported:

As part of Mixxx's sound device detection, my bluetooth device gets
probed, very slowly, on startup. This delays the appearance of the app
by 30 seconds or more. Turning off bluetooth eliminates the problem.

I guess we should somehow blacklist bluetooth audio devices? Here's the
relevant output I see:

ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
BT_GET_CAPABILITIES failed : Input/output error(5)
ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect)
BT_GET_CAPABILITIES failed : Input/output error(5)

** Affects: mixxx
Importance: Undecided
Status: New

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Title:
Mixxx startup very slow when bluetooth is on

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[mixxxbot]

Commented by: Pegasus-RPG
Date: 2012-05-15T18:01:52Z

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I'm against blacklisting these. What if you want to use wireless headphones?

[mixxxbot]

Commented by: inductiveload
Date: 2012-05-28T21:54:40Z

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This same problem occurs when you instantiate a PyAudio class in Python. Each repitition of "ALSA lib audio/pcm_bluetooth.c:1614:(audioservice_expect) BT_GET_CAPABILITIES failed : Input/output error(5)" takes about 6 seconds, so it is incredibly annoying when I have to wait for 4 of them every time I start the program.

This code is enough to trigger it on my development machine (which has bluetooth).

import pyaudio
p = pyaudio.PyAudio()

On a computer without bluetooth, the errors appear, along with some others, but pass instantly.

Is there any idea of if this is fixable or at least work-aroundable?

[mixxxbot]

Commented by: bkgood
Date: 2012-05-30T18:56:03Z

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Audio device probing is slow in general. We should move it to another thread IMO.