I found this affecting 14.04 Trusty.
$ pactl set-card-profile bluez_card.30_17_C8_8B_DF_B1 a2dp
Failure: Input/Output error
so I thought I'd capture some debug logging to "/var/log/syslog" from
bluetoothd (system daemon) by adding "-d" (debug logging) to the Upstart
service file ("/etc/init/bluetooth.conf") so the line reads
exec /usr/sbin/bluetoothd -d
I then restarted the service with
sudo service bluetooth restart
and reconnected to the A2DP headset. I was surprised to see that the
A2DP profile immediately connected!
I then experimented with changing the profile to see if I could
reproduce the error but found that, so far, I cannot:
$ pactl set-card-profile bluez_card.30_17_C8_8B_DF_B1 hsp
$ pactl set-card-profile bluez_card.30_17_C8_8B_DF_B1 a2dp
$
Maybe after a power-off restart, or suspend/resume cycle, the issue will
return, but it seems that restarting the bluetooth service and
reconnecting to the headset solves the issue in my scenario.
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https://bugs.launchpad.net/bugs/1181106
Title:
Failed to change profile to A2DP in 13.04 (Raring), 13.10 (saucy), and
14.04 (trusty)
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