[LAU] anyone running 4.13.15-300.rt5.1.fc27.ccrma.x86_64+rt + snd_usb yet?

[Fernando Lopez-Lezcano]

On 12/02/2017 05:27 PM, Chris Caudle wrote:
> Anyone running the 4.13.15-300.rt5.1.fc27.ccrma.x86_64+rt from the
> PlanetCCRMA repository with a USB audio interface?  I find that my USB
> interface makes output so distorted it is not recognizable with that RT
> kernel, but works OK with the stock fedora kernel.

I just did a quick test on my f27 test laptop (oldish lenovo t510), 
plugged in a Tascam 4x4 USB2 interface while booted into 
4.13.15-300.rt5.1.fc27.ccrma.x86_64 and sound seems to work fine for me 
(I tried browser/pulseaudio playback and jack).

-- Fernando


>  I find no error
> messages in /var/log/messages or dmesg when playing audio.
>
> I tried aplay, but no error messages at all.
>
> I thought perhaps jackd would give useful error messages, but I see no
> errors when starting, but "no callback" messages begin showing up right
> away.  I'm stopped at the moment, I do not know how to proceed without
> finding some kind of error message to point me in the right direction.  Is
> there any other location to find status information on USB audio devices?
>
> This is the rtirq configuration in use:
> RTIRQ_NAME_LIST="usb enp3s4f1 i8042"
> RTIRQ_PRIO_HIGH=95
> RTIRQ_PRIO_DECR=2
>
> Is "usb" enough there, or should it be snd_usb in place of usb?
>
> As an aside, I found that the IRQ priorities were not set automatically, I
> had to manually run rtirq, but that is probably a fedora package problem.
> Getting USB interrupt priority set to a high priority made no difference
>
> This is the startup output from jackd:
> Acquire audio card Audio1
> creating alsa driver ...
> hw:Lambda|hw:Lambda|1024|3|48000|0|0|nomon|swmeter|-|32bit
> configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 3 periods
> ALSA: final selected sample format for capture: 24bit little-endian
> ALSA: use 3 periods for capture
> ALSA: final selected sample format for playback: 24bit little-endian
> ALSA: use 3 periods for playback
> Jack: JackSocketServerChannel::Open
> Jack: JackServerSocket::Bind : addr.sun_path /dev/shm/jack_default_1000_0
> Jack: JackSocketServerChannel::BuildPoolTable size = 1
> Jack: JackEngine::Open
> Jack: JackClientSocket::Connect : addr.sun_path /dev/shm/jack_default_1000_0
> Jack: JackEngine::ClientInternalOpen: name = freewheel
> Jack: JackEngine::AllocateRefNum ref = 1
> Jack: JackPosixSemaphore::Allocate name = jack_sem.1000_default_freewheel
> val = 0
> Jack: JackEngine::NotifyAddClient: name = freewheel
> Jack: JackDriver::ClientNotify ref = 1 driver = system name = freewheel
> notify = 0
> Jack: JackDriver::ClientNotify ref = 0 driver = freewheel name = system
> notify = 0
> Jack: JackConnectionManager::DirectConnect first: ref1 = 1 ref2 = 1
> Jack: JackGraphManager::ConnectRefNum cur_index = 0 ref1 = 1 ref2 = 1
> Jack: JackDriver::SetupDriverSync driver sem in flush mode
> Jack: JackGraphManager::SetBufferSize size = 1024
> Jack: JackAlsaDriver::Attach fBufferSize 1024 fSampleRate 48000
> Using port names patch v0.1 (07.04.2010)
> Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
> Lambda.ss.ports.in
> Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
> Lambda.ports.in
> Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ss.ports.in
> Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ports.in
> Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
> Lambda.ss.ports.out
> Trying to load portnames from /home/chris/.config/jack/cards/Lexicon
> Lambda.ports.out
> Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ss.ports.out
> Trying to load portnames from /etc/jack/cards/Lexicon Lambda.ports.out
> Jack: JackEngine::PortRegister ref = 0 name = system:capture_1 type = 32
> bit float mono audio flags = 22 buffer_size = 1024
> Jack: JackGraphManager::AllocatePortAux port_index = 1 name =
> system:capture_1 type = 32 bit float mono audio
> Jack: JackConnectionManager::AddOutputPort ref = 0 port = 1
> Jack: JackEngine::ClientNotify: no callback for notification = 9
> Jack: JackEngine::ClientNotify: no callback for notification = 9
> Jack: JackAlsaDriver::Attach fCapturePortList[i] 1
> Jack: JackEngine::PortRegister ref = 0 name = system:capture_2 type = 32
> bit float mono audio flags = 22 buffer_size = 1024
> Jack: JackGraphManager::AllocatePortAux port_index = 2 name =
> system:capture_2 type = 32 bit float mono audio
> Jack: JackConnectionManager::AddOutputPort ref = 0 port = 2
> Jack: JackEngine::ClientNotify: no callback for notification = 9
> Jack: JackEngine::ClientNotify: no callback for notification = 9
> Jack: JackAlsaDriver::Attach fCapturePortList[i] 2
> Jack: JackEngine::PortRegister ref = 0 name = system:playback_1 type = 32
> bit float mono audio flags = 21 buffer_size = 1024
> Jack: JackGraphManager::AllocatePortAux port_index = 3 name =
> system:playback_1 type = 32 bit float mono audio
> Jack: JackConnectionManager::AddInputPort ref = 0 port = 3
> Jack: JackEngine::ClientNotify: no callback for notification = 9
> Jack: JackEngine::ClientNotify: no callback for notification = 9
>
>
>
>