Bug 8577 - Scanning for IAPs interrupts A2DP playback
: Scanning for IAPs interrupts A2DP playback
Status: RESOLVED WONTFIX
Product: Connectivity
Bluetooth
: 5.0/(2.2009.51-1)
: N900 Maemo
: Unspecified minor (vote)
: ---
Assigned To: unassigned
: bluetooth-bugs
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:
:
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Reported: 2010-01-27 17:28 UTC by Michael
Modified: 2010-02-03 18:08 UTC (History)
2 users (show)

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Description Michael (reporter) 2010-01-27 17:28:37 UTC
SOFTWARE VERSION:
2.2009.51-1

EXACT STEPS LEADING TO PROBLEM: 
1. Launch media player, play back a (local) MP3 file
2. Connect your A2DP headset via Bluetooth (Sennheiser MM450)
3. Hit the connection chooser, wait

EXPECTED OUTCOME:

No choppy sound

ACTUAL OUTCOME:

Every time the connection chooser scans for connections the sound is
interrupted for roughly 100-200ms. Background scanning also explains some
regular interruptions in the A2DP audio, even when the connection chooser is
not opened.

REPRODUCIBILITY:
always

If you want to reproduce it very fast, just use:
$ dbus-send --system --dest=com.nokia.wlancond --type=method_call --print-reply
/com/nokia/wlancond/request com.nokia.wlancond.request.scan int32:4
array:byte:0 int32:2

EXTRA SOFTWARE INSTALLED:

Nothing running at that time

OTHER COMMENTS:

Does not happen with local playback on the speakers, so it definitely has to do
something with Bluetooth. This bug would be less annoying if #3399 was fixed
and there was no need for third party applications to scan the WiFi.
Comment 1 Lucas Maneos 2010-01-27 20:30:44 UTC
Thanks for reporting this.  Bluetooth and WLAN share the same antenna (see bug
3238) so some interference is unavoidable and this may be WONTFIX as well.
Comment 2 Michael (reporter) 2010-01-27 20:51:57 UTC
Interesting. Passively (or even actively) scanning all Wifi channels might
really be blocking the antenna too long. Is there maybe a way to reduce
scanning speed? Or on the other hand (have to warn you: I have no insight on
how A2DP works), is there the possibility to increase buffer-sizes for A2DP?
Comment 3 Andre Klapper maemo.org 2010-02-03 18:08:04 UTC
As Lucas already correctly wrote, this is a WONTFIX.