Menu
▾
▴
Re: [Rosegarden-user] Running jackd/qjackctl as normal user
|
From: Darcy K. <dar...@sy...> - 2010-05-09 14:44:16
|
I looked on my system (Centos 5), and sequencer is owned by my userid,
and the root groupid
jimmy wrote:
>
> Anyway, you can try some, or all of the following commands:
>
> ls -altr /dev | grep sequencer
> ls -altr /dev | grep sequencer2
> ls -altr /dev | grep dsp
> ls -altr /dev | grep audio
> ls -altr /dev | grep midi
> ls -altr /dev | grep mixer
>
>
>
>
>> Date: Sun, 09 May 2010 00:30:35 -0400
>> From: Darcy Kahle <dar...@sy...>
>>
>> Under RedHat (and RedHat-based, like Centos - what I am
>> running), you
>> have to add the following lines to
>> /etc/security/limits.conf:
>>
>> <user> - rtprio 95
>> <user> - memlock 512000
>> <user> - nice -19
>>
>> Use your own user name in place of <user>. To
>> my knowledge, the kernel
>> already does Real-Time, so you do not need to mess with the
>> kernel
>>
>> Thomas Sattler wrote:
>>
>>> Jimmy,
>>>
>>> Thanks for your reply; I have issued:
>>>
>>> ls -altr /dev/ | grep audio
>>>
>>> and it does nothing. I am on Fedora 11, not a
>>>
>> "studio" distro; I've
>>
>>> used Red Hat Linux back to the 6.1 days, so staying
>>>
>> with Fedora was an
>>
>>> easy decision. Since I have a Quad-core
>>>
>> processor and 6 GB of memory,
>>
>>> I don't have any latency issues that I can see.
>>>
>>>
>>>
>>>
>>> On Sat, May 8, 2010 at 8:00 PM, jimmy <wg...@ya...
>>>
>>> <mailto:wg...@ya...>>
>>>
>> wrote:
>>
>>> > Date: Sat, 8 May 2010
>>>
>> 01:40:18 -0400
>>
>>> > From: "D. Michael
>>>
>> McIntyre"
>>
>>> <mic...@ro...
>>> <mailto:mic...@ro...>>
>>> >
>>> > On Saturday 08 May 2010,
>>>
>> Thomas Sattler wrote:
>>
>>> >
>>> > > Hmmmmm.....
>>> > >
>>> > > I don't see any red
>>>
>> LED anyplace. Only yellow.
>>
>>> >
>>> > Audio is busted.
>>>
>> These tracks should probably be
>>
>>> > showing white
>>>
>> (colorless,
>>
>>> > ie. of no useful type)
>>>
>> LEDs instead of yellow, but we'll
>>
>>> > never sort that mess
>>> > out.
>>> >
>>> > Oh well.
>>> >
>>> > > But here is the
>>>
>> interesting part: I start
>>
>>> > qjackctl as root (because
>>>
>> it
>>
>>> > > doesn't work right
>>>
>> otherwise). But I start
>>
>>> > Rosegarden with my normal
>>>
>> user
>>
>>> > > account, and 1.7.3
>>>
>> always complained that Jack is not
>>
>>> > running.
>>> >
>>> > That's because you have
>>>
>> to run JACK and whatever
>>
>>> > applications you want to
>>>
>> use
>>
>>> > it with as the same
>>>
>> user. Typically you run on a
>>
>>> > setup that allows you to
>>>
>> run
>>
>>> > all of this as your user,
>>>
>> but that kind of setup is
>>
>>> > something best left to
>>>
>> the
>>
>>> > studio-oriented distro
>>>
>> variants these days. I'm not
>>
>>> > going to get into that.
>>> >
>>> > > I ignored
>>> > > this, since it
>>>
>> worked. 10.4.1 doesn't complain
>>
>>> > about Jack, but I see no
>>> > > red LED.
>>> >
>>> > It does complain about
>>>
>> JACK, it just does so quietly.
>>
>>> > You should see a /!\
>>> > warning icon in the
>>>
>> bottom right corner of the screen, and
>>
>>> > if you click it, it
>>> > will inform you that
>>>
>> audio is busted.
>>
>>> >
>>> > You need to figure out
>>>
>> why QJackCtl doesn't work as your
>>
>>> > user, but that's more
>>> > of a problem than I'm
>>>
>> willing to deal with. What
>>
>>> > matters for your most
>>> > immediate purposes is
>>>
>> that you're going to have to manually
>>
>>> > reassign these
>>> > broken audio tracks to a
>>>
>> MIDI device to get them to work.
>>
>>> > --
>>> > D. Michael McIntyre
>>>
>>>
>>>
>>> You should not run Jack
>>>
>> (jackd) as root user. This is the problem
>>
>>> for most distributions out
>>>
>> there that are ignorant of how to setup
>>
>>> properly for MIDI/audio apps.
>>>
>>> If you can only run
>>>
>> jackd/qjackctl as root, it is because the user
>>
>>> account you run under is not
>>>
>> part of the "audio" group. I assume
>>
>>> "audio" group is also the case
>>>
>> with your distribution, if that is
>>
>>> the case, substitute whatever
>>>
>> group name that owns the devices
>>
>>> listed below.
>>>
>>> On my system, the command
>>>
>>> ls -altr /dev/ | grep
>>>
>> audio
>>
>>> will show:
>>>
>>>
>>> crw-rw----+ 1 root
>>>
>> audio 14, 1 May 6 20:10
>> sequencer
>>
>>> crw-rw----+ 1 root
>>>
>> audio 14, 8 May 6 20:10
>> sequencer2
>>
>>> crw-rw----+ 1 root
>>>
>> audio 14, 3 May 6 20:10
>> dsp
>>
>>> crw-rw----+ 1 root
>>>
>> audio 14, 4 May 6 20:10
>> audio
>>
>>> crw-rw----+ 1 root
>>>
>> audio 14, 2 May 6 20:10
>> midi
>>
>>> crw-rw----+ 1 root
>>>
>> audio 14, 0 May 6 20:10
>> mixer
>>
>>> crw-rw----+ 1 root
>>>
>> audio 14, 9 May 6 20:10
>> dmmidi
>>
>>> All of which are Alsa devices
>>>
>> (some of those may be Alsa emulation
>>
>>> of OSS devices), which means
>>>
>> only root user and any user belong to
>>
>>> the audio group can read and
>>>
>> write to these device(s).
>>
>>> If you run jackd from a user
>>>
>> account that doesn't belong to the
>>
>>> audio group, then jackd won't
>>>
>> be able to access (read/write to)
>>
>>> the devices listed
>>>
>> above. You will need to add that user account
>>
>>> to the audio group, log out
>>>
>> and log back in for it to take effect.
>>
>>> You don't even have to log out and
>>>
>> log back in, try "su -
>>
>>> <useraccount>"
>>>
>> (substitute <useraccount> with the actual user
>>
>>> account id) from the command
>>>
>> line will let you log-in to a new
>>
>>> session only for that
>>>
>> commandline window, which you can launch
>>
>>> jackd there as a quick way to
>>>
>> test.
>>
>>> I assume your account doesn't
>>>
>> belong to the audio group. You can
>>
>>> change that. From the
>>>
>> commandline, try
>>
>>> su -
>>>
>>> (need to enter root password)
>>>
>> that commandline window will log in
>>
>>> as root user. For the
>>>
>> command below, substitute "guest" with your
>>
>>> actual userid (that needs to
>>>
>> be added to the audio group). From
>>
>>> the root command prompt, try:
>>>
>>>
>>> tmpId="guest" ;
>>>
>> tmpgroups=` /usr/bin/groups ${tmpId} | sed -e
>>
>>> "s~.*: ~~" | sed -e "s~$~
>>>
>> audio~" | sed -e "s~ ~,~g" ` ;
>>
>>> /usr/sbin/usermod -G
>>>
>> "${tmpgroups}" "${tmpId}" ; /usr/bin/groups
>>
>>> "${tmpId}"
>>>
>>>
>>> The one-line above include
>>>
>> multiple commands that will change the
>>
>>> "guest" account (change
>>>
>> "guest" to your actual userid) to add that
>>
>>> user to the "audio"
>>>
>> group. After that, you can try logout and
>>
>>> login again (or "su - guest")
>>>
>> to try running jackd/qjackctl under
>>
>>> that userid.
>>>
>>> You may also want to check to
>>>
>> see if your kernel has "high
>>
>>> resolution timer" compiled-in,
>>>
>> very useful relating to MIDI
>>
>>> latency issues.
>>>
>>> Jimmy
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>> ------------------------------------------------------------------------------
>>
>>>
>>>
>> _______________________________________________
>>
>>> Rosegarden-user mailing list
>>> Ros...@li...
>>> <mailto:Ros...@li...>
>>>
>> - use the link
>>
>>> below to unsubscribe
>>> https://lists.sourceforge.net/lists/listinfo/rosegarden-user
>>>
>>>
>>>
>>>
>> ------------------------------------------------------------------------
>>
>>>
>> ------------------------------------------------------------------------------
>>
>>>
>>>
>>>
>> ------------------------------------------------------------------------
>>
>>> _______________________________________________
>>> Rosegarden-user mailing list
>>> Ros...@li...
>>>
>> - use the link below to unsubscribe
>>
>>> https://lists.sourceforge.net/lists/listinfo/rosegarden-user
>>>
>>>
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>>
>> ------------------------------
>>
>> ------------------------------------------------------------------------------
>>
>>
>>
>> ------------------------------
>>
>> _______________________________________________
>> Rosegarden-user mailing list
>> Ros...@li...
>> https://lists.sourceforge.net/lists/listinfo/rosegarden-user
>>
>>
>> End of Rosegarden-user Digest, Vol 48, Issue 13
>> ***********************************************
>>
>>
>
>
>
>
>
>
|