Bug#805414: gdm3: disable pulseaudio to prevent capturing A2DP sink on session start

[Antoine Beaupré]

On 2017-07-02 23:16:19, Michael Biebl wrote:
> Am 02.07.2017 um 23:11 schrieb Antoine Beaupré:
>> On 2017-07-02 02:41:26, Michael Biebl wrote:
>>> Am 02.07.2017 um 02:38 schrieb Michael Biebl:
>>>> Am 02.07.2017 um 02:30 schrieb Antoine Beaupré:
>>>>> Or do we treat this as a PA bug ("should release BT")?
>>>>
>>>> I'm not sure, actually.
>>>
>>>
>>> https://wiki.archlinux.org/index.php/Talk:Bluetooth_headset#GDMs_pulseaudio_instance_captures_bluetooth_headset
>>>
>>> suggests that a custom PA config shipped by gdm could workaround this by
>>> unloading the bluetooth module.
>>>
>>> That feels a bit like a hack though.
>>> The real issue is probably that PA doesn't release the BT device.
>> 
>> So I have found this is already reported in the PA bugtracker in #845938
>> (merged with #848130) - let's treat this separately.
>> 
>> There's a workaround for GDM: disable bluetooth support as documented in
>> the Arch wiki. We could patch the gdm3 pacakge to do exactly that while
>> PA fixes its stuff.
>> 
>> The rationale behind disabling BT support there is that there's zero UI
>> in GDM3 to pair devices. Until those exists, it's meaningless to have BT
>> support at the login prompt: it will never work, short of the user
>> switching to a VT and hacking commands by hand, at which point all bets
>> are off and we can assume the user will figure out a way.
>> 
>> Therefore I would argue we can have a workaround here, in the gdm3
>> package, for now.
>
> Have you tested the workaround from the arch wiki and can you confirm it
> works?

I cannot, unfortunately, test this anymore, as I have disabled the
pulseaudio socket as directed earlier, with:

rm /var/lib/gdm3/.config/systemd/user/sockets.target.wants/pulseaudio.socket

I don't know what that was pointing to, so I can't quite restore that
behavior directly.

A.

-- 
Imagination is more important than knowledge.
Knowledge is limited.
Imagination encircles the world.
                        - Albert Einstein