Mark Rissberger wrote:
Michael T. Dean wrote:
Mark Rissberger wrote:
First off, I'd like to thank everyone that helped me get LIRC
working with the PVR150. It works like a dream now. The problem
that I have now seems like it may be a permission issue but I'm not
sure where. I can't use ALSA if I'm logged in as the mythtv user
but it works fine if I'm logged in as root. Here is what I get as
root and as mythtv:
[EMAIL PROTECTED] /]# aplay /usr/share/sounds/KDE_Startup.wav
Playing WAVE '/usr/share/sounds/KDE_Startup.wav' : Signed 16 bit
Little Endian, Rate 22050 Hz, Mono
[EMAIL PROTECTED] /]# exit
exit
[EMAIL PROTECTED] /]$ aplay /usr/share/sounds/KDE_Startup.wav
ALSA lib pcm_dmix.c:797:(snd_pcm_dmix_open) unable to create IPC shm
instance
aplay: main:533: audio open error: Permission denied
Here are the permissions of /dev/audio and /dev/dsp:
[EMAIL PROTECTED] /]$ ls -l /dev/au*
crwxrwxrwx 1 mythtv root 14, 4 Oct 18 03:24 /dev/audio
[EMAIL PROTECTED] /]$ ls -l /dev/dsp
crwxrwxrwx 1 mythtv root 14, 3 Oct 18 03:24 /dev/dsp
Any ideas????
ls -al /dev/snd
to show ALSA devices.
Most likely you'll see a group called "audio" or something. Then,
just add mythtv user to the audio group. If not (i.e. if owner and
group are root), fix the permissions (probably in udev scripts--
http://www.reactivated.net/writing_udev_rules.html ).
Its really odd. Now that I've changed the group on '/dev/snd/*',
'/dev/shm', '/dev/dsp', and '/dev/audio' to mythtv, everything works
fine. Until I root plays a sound and then I'm right back to the above
error msg, unable to create IPC shm instance.
Why would this be? root must be doing something to the devices when
it plays a sound. Any ideas?
Thanks for the above help. At least I've gotten this far.
It would be much easier to guess with a full description of the commands
you executed. You said you changed the group on the ALSA devices. Did
you a) change it from the command line (in which case your system is
still configured to set it to the original group), b) change the udev
scripts to set the group to mythtv (instead of a more appropriate group
like audio--to which the mythtv user should be added), or c) execute
some other commands that I can't even imagine.
Note, also, that many display managers assign ownership of certain
devices (like consoles and audio devices) to the user that logs in.
It's possible you have something like that re-assigning ownership. In
other words, there are just too many plausible explanations to guess
without more info. And, the most likely guess is that you "treated the
symptom and not the problem" in which case debugging would be a waste of
time.
Oh, and BTW, root should never execute any commands that play sound,
anyway. After all, what do you think this is, Windows? ;)
Mike
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