On Mon, 18 May 2015 17:38:33 +0200 Lennart Poettering <lenn...@poettering.net> wrote:
> On Sun, 17.05.15 12:46, Mikhail Morfikov (mmorfi...@gmail.com) wrote: > > > As you can read, for instance here > > ( > > http://enotty.pipebreaker.pl/2012/05/23/linux-automatic-user-acl-management/ > > ), logind, which is a part of systemd, can set permissions to some > > devices for user sessions. There's also a vid showing how this kind > > of behavior works in practice > > ( https://www.youtube.com/watch?v=qcD4Qr5ldbI ). In short, if you > > start, let's say, amarok, and you play some song, you will hear the > > sound till you switch to another user or TTY where you have only the > > login prompt. That's because the active session became inactive. > > > > I know that you can simply add a user (or users) to a specific > > group, in this case "audio", and that will 'fix' this issue, but > > I'm wondering if there's another solution. What I really want is to > > set some permissions for the process so it could use the sound card > > all the time, even when all users have their sessions locked. > > > > Is that possible? I'm asking because I often listen to the music > > and I don't really need my monitor to be on most of the time, so I > > just lock the screen. But when I lock the screen, the active > > session becomes inactive and amarok stops playing. And yes, the > > screen should be locked, and not just turned off. > > To my knowledge GNOME runs the screen lock from the same session, and > thus does not suffer by the problem... > > Generally, making your process member of the "audio" group is the way > to go, if you want to forego the per-session device access control > logic logind implements. You can use /usr/bin/newgrp to join a group > for some of your processes only. > > Lennart > Something is wrong. I did the following steps: $ newgrp audio In the log I have the following message: May 18 18:02:19 morfikownia newgrp[80543]: user 'morfik' (login 'morfik' on pts/7) switched to group 'audio' Then I started amarok (in the same terminal): $ amarok $ ps -eo user,group,args | grep amarok morfik audio amarok So it says the process has the audio group, but the sound disappears when I switch to TTY, so nothing has changed. Should this happen, or am I supposed to do something else in order to make it work?
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