[pulseaudio-discuss] Pulseaudio 8/Bluez5 fails to load module-bluez5-device when running in system-wide mode

[Vlad Nikolyukin]

I'm running Jessie on Raspberry Pi2. I'm trying to install Pulseaudio 8
from the source, but having problems running it in system mode with Bluez5
with A2DP support.

On startup in system-wide mode, it fails with `"module-bluez5-discover.c:
Failed to load module for device /org/bluez/hci0/dev_AC_CF_85_23_8C_78"`
error when I connect my phone to bluetooth.

If I simply restart pulseaudio under normal user account (pi) using:

    pulseaudio -vvvv

and connecting the phone, everything works fine and I can play music via
A2DP from the phone.

Pulseaudio is setup to run as systemd service in
`/etc/systemd/system/pulseaudio.service`:

    /usr/local/bin/pulseaudio --system --disallow-exit --disable-shm
--exit-idle-time=-1 --disallow-module-loading

Here is the verbose log output when it fails to load module:

    D: [pulseaudio] bluez5-util.c: dbus: path=/MediaEndpoint/A2DPSink,
interface=org.bluez.MediaEndpoint1, member=SetConfiguration
    D: [pulseaudio] bluez5-util.c: Transport
/org/bluez/hci0/dev_AC_CF_85_23_8C_78/fd3 state changed from disconnected
to idle
    D: [pulseaudio] module-bluez5-discover.c: Loading module-bluez5-device
path=/org/bluez/hci0/dev_AC_CF_85_23_8C_78
    W: [pulseaudio] module-bluez5-discover.c: Failed to load module for
device /org/bluez/hci0/dev_AC_CF_85_23_8C_78
    D: [pulseaudio] bluez5-util.c: Transport
/org/bluez/hci0/dev_AC_CF_85_23_8C_78/fd3 available for profile a2dp_source
    D: [pulseaudio] bluez5-util.c: Unknown interface
org.freedesktop.DBus.Introspectable found, skipping
    D: [pulseaudio] bluez5-util.c: Unknown interface org.bluez.MediaPlayer1
found, skipping
    D: [pulseaudio] bluez5-util.c: Unknown interface
org.freedesktop.DBus.Properties found, skipping


Here is the same section when it manages load the module when I run
pulseaudio under normal user account ("pi").

    D: [pulseaudio] bluez5-util.c: dbus: path=/MediaEndpoint/A2DPSink,
interface=org.bluez.MediaEndpoint1, member=SetConfiguration
    D: [pulseaudio] bluez5-util.c: Transport
/org/bluez/hci0/dev_AC_CF_85_23_8C_78/fd6 state changed from disconnected
to idle
    D: [pulseaudio] module-bluez5-discover.c: Loading module-bluez5-device
path=/org/bluez/hci0/dev_AC_CF_85_23_8C_78
    I: [pulseaudio] module-card-restore.c: Restoring port latency offsets
for card bluez_card.AC_CF_85_23_8C_78.
    I: [pulseaudio] card.c: Created 1 "bluez_card.AC_CF_85_23_8C_78"
    D: [pulseaudio] protocol-dbus.c: Interface
org.PulseAudio.Core1.CardProfile added for object
/org/pulseaudio/core1/card1/profile0
    D: [pulseaudio] protocol-dbus.c: Interface
org.PulseAudio.Core1.CardProfile added for object
/org/pulseaudio/core1/card1/profile1
    D: [pulseaudio] protocol-dbus.c: Interface
org.PulseAudio.Core1.CardProfile added for object
/org/pulseaudio/core1/card1/profile2
    D: [pulseaudio] protocol-dbus.c: Interface org.PulseAudio.Core1.Card
added for object /org/pulseaudio/core1/card1
    D: [pulseaudio] module-bluez5-device.c: Acquiring transport
/org/bluez/hci0/dev_AC_CF_85_23_8C_78/fd6
    I: [pulseaudio] bluez5-util.c: Failed optional acquire of unavailable
transport /org/bluez/hci0/dev_AC_CF_85_23_8C_78/fd6
    I: [pulseaudio] module-bluez5-device.c: SBC parameters: allocation=0,
subbands=1, blocks=3, bitpool=2
    I: [pulseaudio] source.c: Created source 1
"bluez_source.AC_CF_85_23_8C_78" with sample spec s16le 2ch 44100Hz and
channel map front-left,front-right
    I: [pulseaudio] source.c:     bluetooth.protocol = "a2dp_source"
    I: [pulseaudio] source.c:     device.description = "Nexus 6P"

The only configuration change that I did to Pulseaudio was in `/etc/pulse/
system.pa`, I added this:

    ### Bluetooth Support
    .ifexists module-bluetooth-discover.so
    load-module module-bluetooth-discover
    .endif


I think I configured permissions correctly too:

`pulse` is added to `audio`
`pulse` is added `lp`
`pi` user is added to `pulse-access`

DBUS permissions are set as follows:

    <busconfig>
           <policy user="root">
                    <allow own="org.pulseaudio.Server"/>
                    <allow send_destination="org.bluez"/>
                    <allow send_interface="org.bluez.Manager"/>
            </policy>
            <policy user="pulse">
                    <allow own="org.pulseaudio.Server"/>
                    <allow send_destination="org.bluez"/>
                    <allow send_interface="org.bluez.Manager"/>
            </policy>
            <policy context="default">
                    <deny own="org.pulseaudio.Server"/>
                    <deny send_destination="org.bluez"/>
                    <deny send_interface="org.bluez.Manager"/>
            </policy>
    </busconfig>

My phone is paired and connected to bluetooth stack fine.



Can anyone help to understand why Pulseaudio doesn't want to work with
Bluez in system mode ?
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