[LAU] Trying to run jackd from udev

[Raphaël BOLLEN]

On 03/22/2013 11:51 PM, Jeremy Jongepier wrote:
> I'm trying to run jackd from a script that is triggered by udev. But when I try to do so jackd
> complains:
>
> jackd 0.122.0
> ...
> JACK is running in realtime mode, but you are not allowed to use realtime scheduling.
> ...
>


Hi Jeremy,

I've had the same error message and issue trying to start an application using jack form an init.d 
script at boot time. It seems that start-stop-daemon does not impose PAM ("Pluggable Authentication 
Module") limits to the process it starts. Maybe you are facing a similar issue with udev. My 
solution was to autologin the user and then start the application.

Cheers

--
Raphaël.

> But the user trying to run jackd (pi) is a member of the audio group. The udev rule looks like this:
>
> ATTRS{idVendor}=="0218", ATTRS{idProduct}=="0001", ACTION=="change", RUN+="/usr/bin/sudo -u pi -s
> /home/pi/bin/drumpad"
>
> Is this maybe related to using sudo? I'd like to get this working, the idea is that whenever I plug
> in my drumpad the udev rule and thus the script gets executed. The script checks if jackd is already
> started and then moves on starting up jalv with the drumkv1 plug-in. The script itself works fine,
> it's just the udev part that got me puzzled.
>
> Thanks!
>
> Jeremy
>
>
>
>
>
>
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>


-- 
Raphaël