[pulseaudio-discuss] No dynamic ACLs on /dev/snd/* when opening a new virtual terminal via openvt

[Alex K]

Thanks for your reply, Tanu.

Could you please clarify what kind of session do you have in mind, how
would I check for a list of these sessions? I'll proceed with my
troubleshooting from there. Apparently, all I need is to make openvt to
create a session.


2014-09-18 5:48 GMT-04:00 Tanu Kaskinen <tanu.kaskinen at linux.intel.com>:

> On Wed, 2014-09-17 at 11:27 -0400, Alex K wrote:
> > Hi team,
> >
> >
> > I have a puzzling question crossing PulseAudio and systemd-logind
> > behavior. In short, if you open a new virtual terminal with sudo
> > openvt -vlu, there will be no sound in it, because dynamic ACL
> > on /dev/snd/* doesn't include your account.
> >
> >
> > How to reproduce:
> > 1. Switch to first VT and login (Ctrl+Alt+F1)
> > 2. Open a new virtual terminal: sudo openvt -vlu (it is likely going
> > to be tty8)
> > 3. Switch to tty8: Ctrl+Alt+F8
> > 4. Try to play a sound: play /path/to/wav/file.wav
> >
> >
> > Play command will be stuck until you switch to another VT: ACLs get
> > updated, sound gets played in the background.
> >
> >
> > What would be a good way to fix it?
>
> PulseAudio doesn't have any control over the ACLs, the systemd mailing
> list would be the right place to ask.
>
> FWIW, I tried the steps you gave on Fedora 20, and I observed the same
> behaviour. I'm not sure this is a bug, however. The ACLs are set based
> on who has an active session on the seat. When you logged in in tty1, a
> new session was created, and it was marked as active. When you created a
> new tty with openvt, no new session was created. When you switched to
> the new tty, the session on tty1 was marked as inactive, and since there
> was no session bound to tty8, from logind's point of view no session was
> active, hence no access to the sound card for anyone.
>
> The question is that should a new session be created when creating a new
> tty with openvt. I don't know the answer to that. (Another alternative
> would be to tie the session on tty1 also to tty8, but I don't think that
> makes sense.)
>
> --
> Tanu
>
>
>
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