[Bug 1419186] [NEW] bluetooth doesn't recover well from interruption

[gregrwm]

Public bug reported:

logged in using twm, i used blueman to pair my bose soundlink iii and
set it as audio sink, and pair my plantronics 8xx and set it as headset
service.  i'm using mplayer to play radio via alsa /etc/asound.conf
defined pcm to the bose.  i've opened linphone merely to test if it will
work.  it's default settings are "ALSA: default device".  pulseaudio is
installed but not being used iiuc.  i click on linphone's "play" button
to test the ring sound.  the ring sound does arrive onto the plantronics
8xx, albeit with the first fraction of a second missing, but so far no
complaint.

immediately thereafter, a series of skips is heard in the bose audio,
spanning several seconds.

now i'm no expert regarding bluetooth bandwidth or other bluetooth
limitations, but what i hear is poor recovery from an interruption.  the
test ring sound was less than two seconds, so it's not like there were
several seconds of overlapping audio.  even if bluetooth bandwidth is so
narrow as to not accomodate the two parallel channels, should it really
take several seconds of numerous dropouts before the audio stream
settles again?

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: bluez-alsa 4.101-0ubuntu22
ProcVersionSignature: Ubuntu 3.18.0-11.12-generic 3.18.3
Uname: Linux 3.18.0-11-generic i686
ApportVersion: 2.15.1-0ubuntu4
Architecture: i386
Date: Fri Feb  6 17:13:08 2015
InstallationDate: Installed on 2015-01-16 (21 days ago)
InstallationMedia: Lubuntu 15.04 "Vivid Vervet" - Alpha i386 (20150114)
InterestingModules: bnep rfcomm btusb bluetooth
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz ro root=UUID=5116dd42-c618-49a4-885e-84c697b53abd panic=30
SourcePackage: bluez
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/09/2008
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: K8M800-8237
dmi.chassis.type: 3
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd01/09/2008:svn:pn:pvr:rvn:rnK8M800-8237:rvr:cvn:ct3:cvr:
hciconfig:
 hci0:	Type: BR/EDR  Bus: USB
 	BD Address: 00:15:83:6A:58:96  ACL MTU: 310:10  SCO MTU: 64:8
 	UP RUNNING PSCAN 
 	RX bytes:3226118 acl:43 sco:6565 events:405902 errors:0
 	TX bytes:196839358 acl:683492 sco:6529 commands:24015 errors:7
rfkill:
 0: hci0: Bluetooth
 	Soft blocked: no
 	Hard blocked: no

** Affects: bluez (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 vivid

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https://bugs.launchpad.net/bugs/1419186

Title:
  bluetooth doesn't recover well from interruption

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