[alsa-devel] [FFADO-devel] M-audio Audiophile Firewire

[Pap Peti]

On 2016-10-24 00:43, Jonathan Woithe wrote:
> On Sun, Oct 23, 2016 at 08:22:32PM +0200, Peti Pap wrote:
>> I installed now an Ubuntu 16.10 (because this distro can handle ffado 2.3
>> well), and now almost work the playback (but sometimes a bit noisy, and I
>> dont know the reason).
>> When I start the FFADO Mixer from terminal, I get the following messages:
>>
>> Cannot create RT messagebuffer thread: Operation not permitted (1)
>> Retrying messagebuffer thread without RT scheduling
>> Messagebuffer not realtime; consider enabling RT scheduling for user
> This indicates that your user does not have access to the realtime
> scheduling features on the system.  While this should not affect the
> operation of ffado-mixer (and its related ffado-dbus-server), it will cause
> problems if you choose to use the FFADO audio streaming system via jackd's
> "firewire" backend.  From the above message I'm not sure if you're doing
> this though: the "noisy" playback might still be relating to your use of the
> ALSA streaming driver.
>
> On most distributions it is sufficient to add your user to the "audio".
>
> Not having access to the realtime scheduling shouldn't cause ffado-mixer any
> problem.  However, just to be sure it's probably worth adding your user to
> the audio group to see if that improves the ffado-mixer behaviour.
>
>> -----------------------------------------------
>> FFADO Control DBUS service
>> Part of the FFADO project -- www.ffado.org
>> Version: 2.3.0-
>> (C) 2008, Pieter Palmers
>> This program comes with ABSOLUTELY NO WARRANTY.
>> -----------------------------------------------
>>
>> 1477244892717343:  (ffado-dbus-server.cpp)[ 270] main:  Discovering
>> devices...
>> 03966254548:  (ffado-dbus-server.cpp)[ 329] main: DBUS service running
>> 03966254588:  (ffado-dbus-server.cpp)[ 330] main: press ctrl-c to stop it &
>> exit
>> 03966254597: Debug (ffado-dbus-server.cpp)[ 333] main: dispatching...
>> 03970152237: Error (avc_avdevice.cpp)[ 300] supportsSamplingFrequency:
>> sample rate not supported by input plug
> I'm not sure what would cause this.  Was the device actively streaming audio
> at the time you started ffado-dbus-server?  That still shouldn't cause any
> issues, but obviously something is amiss.
>
>> (And if I close the mixer GUI, I cant re-open again without killing the
>> ffado-dbus-server)
> That's strange.  Something seems to be getting hung up somewhere.
>
> Peti: to keep the original thread in alsa-devel on topic, you may like to
> subscribe to ffado-devel and start a fresh thread there about the
> above ffado-mixer / ffado-dbus-server issues you are seeing.
>
> Regards
>    jonathan