LinuxMusicians

Posted: **Thu Jul 21, 2016 1:39 am**

I can't (yet) get the Scarlett Solo to work with Jack. I had Jack set up and working properly with my Native Instruments K6. In jack/config.xml I previosly used hw:k6,0 as the device specifier:

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 <drivers>
  <driver name="alsa">
   <option name="device">hw:k6,0</option>

I changed audio interfaces to try out the new Focusrite Scarlett Solo today. I expected I would only have to change the device name to hw:USB,0. However, that doesn't work.

The logs show:

Wed Jul 20 20:54:35 2016: Starting jack server...
Wed Jul 20 20:54:35 2016: JACK server starting in realtime mode with priority 70
Wed Jul 20 20:54:35 2016: self-connect-mode is "Don't restrict self connect requests"
Wed Jul 20 20:54:35 2016: ERROR: control open "hw:usb" (No such device)
Wed Jul 20 20:54:35 2016: ERROR: control open "hw:usb" (No such device)
Wed Jul 20 20:54:35 2016: creating alsa driver ... hw:usb,0|hw:usb,0|512|3|48000|0|0|nomon|swmeter|-|32bit
Wed Jul 20 20:54:35 2016: ERROR: control open "hw:usb" (No such device)
Wed Jul 20 20:54:35 2016: ERROR: ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to capture-only mode
Wed Jul 20 20:54:35 2016: ERROR: Cannot initialize driver
Wed Jul 20 20:54:35 2016: ERROR: JackServer::Open failed with -1
Wed Jul 20 20:54:35 2016: ERROR: Failed to open server

I assume the problem can't be anything major because my system is working fine with the K6.

Here's some more info:

I'm running Arch Linux with both jack2dbus and pulseaudio. I am using pulseaudio-jack and my configuration is based on the "new new" method mentioned in the Arch wiki here https://wiki.archlinux.org/index.php/Pu ... rough_JACK. That was working perfectly with the K6.

cat /proc/asound/cards

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 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xfba30000 irq 76
 1 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xfb080000 irq 75
 2 [USB            ]: USB-Audio - Scarlett Solo USB
                      Focusrite Scarlett Solo USB at usb-0000:00:14.0-14, high speed

lsusb:

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Bus 001 Device 009: ID 1235:8205 Focusrite-Novation

cat /proc/asound/card2/pcm0p/info

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card: 2                                                                                                                                         
device: 0                                                                                                                                       
subdevice: 0                                                                                                                                    
stream: PLAYBACK                                                                                                                                
id: USB Audio                                                                                                                                   
name: USB Audio                                                                                                                                 
subname: subdevice #0                                                                                                                           
class: 0                                                                                                                                        
subclass: 0                                                                                                                                     
subdevices_count: 1                                                                                                                             
subdevices_avail: 1

cat /proc/asound/card2/stream0

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Focusrite Scarlett Solo USB at usb-0000:00:14.0-14, high speed : USB Audio

Posted: **Thu Jul 21, 2016 5:04 am**

So here is what I had to do:

deleted database files in ~/.config/pulse (not sure if this was needed)
exit KDE to a virtual console
pulseaudio --kill
jack_control dps device hw:USB
jack_control dps capture hw:USB
jack_control dps playback hw:USB

then start KDE again and everything works. It was the last two lines that fixed it (because I have duplex set to true).
This wasn't really different from what I had tried already with KDE running, but I guess I had missed some small detail somewhere.

LinuxMusicians

[SOLVED] Jack ERROR: control open "hw:usb" (No such device)

[SOLVED] Jack ERROR: control open "hw:usb" (No such device)

Re: Jack ERROR: control open "hw:usb" (No such device)