PulseAudio does not appear to recognize the Focusrite Scarlett 6i6 USB audio interface. The 2i2, however, is properly recognized and it works as expected. I can't seem to get the 6i6 to work on the same system where the 2i2 worked. Both are said to be class compliant USB devices. I also tried the 6i6 on another computer with a fresh system installation (Kubuntu 12.04) and the result is the same -- PulseAudio doesn't see the 6i6.Here's the only official info I found:Linux and Focusrite / Novation products | Focusrite Developmenthttp://focusritedevelopmentteam.wordpress.com/2012/04/23/linux-and-focusrite-novation-products/Should work: Scarlett 2i2, 2i4, 8i6, 18i6, 6i6, 18i8, 18i20, Saffire 6 USB MkII (USB audio class 2.0 compatible), Forte and iTrack Solo.My experience is that the 6i6 does not work (while the 2i2 does). I'm hoping someone here has figured it out or can tell me the steps I need to figure it out.$ lsusb[snip other h/w]Bus 001 Device 006: ID 1235:8012 Novation EMS $ cat /proc/asound/cards[snip other h/w] 1 [USB            ]: USB-Audio - Scarlett 6i6 USB                      Focusrite Scarlett 6i6 USB at usb-0000:00:1a.0-1.2, high speed$ pacmd list-cardsWelcome to PulseAudio! Use help for usage information.>>> 1 card(s) available.[the 6i6 is not shown, only the built-in sound card is shown]I'm running Kubuntu 12.04 LTS (KDE) and System Settings -> Multimedia -> Phonon does not show the 6i6 at all.Previously the 2i2 was recognized like this:#lsusb[snip other h/w]Bus 003 Device 002: ID 1235:8006 Novation EMS $ cat /proc/asound/cards1 [USB            ]: USB-Audio - Scarlett 2i2 USB                      Focusrite Scarlett 2i2 USB at usb-0000:04:00.0-1, high speed$ pacmd list-cards      Welcome to PulseAudio! Use help for usage information.      >>> 3 card(s) available.      [snip other cards]    index: 2    name: <alsa_card.usb-Focusrite_Scarlett_2i2_USB-00-USB>Thanks
Ideas how to get my usb audio interface to work with Linux?
drivers;kde;audio;pulseaudio;kubuntu
I solved this by installing KX Studio. The instructions can be found here: http://kxstudio.sourceforge.net/DocumentationThese are the steps I used. (They are directly from the KX Studio documentation.) In my case it was required to install the low latency kernel. I tried the generic kernel first and that did not do the trick. Once I installed KX Studio and the kxstudio-kernel-lowlatency, my audio interface just worked.Step 1 - Enable the repositoriesOpen up the 'Software Sources' (usually in the System menu), and on the 3rd party separator, add this code:ppa:kxstudio-team/kxstudioAlternatively, you can run this command, which has the same effect:sudo add-apt-repository ppa:kxstudio-team/kxstudioNext, reload the sources (method depends on the current application), and install the package 'kxstudio-repos'. Then reload the sources again.You can do the same thing in the command-line with:sudo apt-get updatesudo apt-get install kxstudio-repossudo apt-get updateNOTE: If you're running 12.04, it's recommended to also install 'kxstudio-repos-kde49' which will update KDE4 to the stable 4.9.5 version.Step 2 - Update the systemOnce you've got the repositories set-up, it's time to upgrade the system (ie, update the software, not upgrade to a newer Ubuntu release!).Simply use whatever tool your Desktop Environment provides (Ubuntu Software Center, Synaptic, Update Manager, KPackageKit, Muon, etc).If you want to use the command-line, or if you just got too many dependency conflicts (can happen if you enabled many PPAs before upgrading to KXStudio), the command is:sudo apt-get dist-upgradeEven though it says 'dist-upgrade', it will not update the Ubuntu version. In this case, 'dist' means something like resolve conflicts, even if some stuff gets removed.This step will take some time. Some minor questions may appear while the upgrade takes place.Step 3 - Install the KXStudio DesktopAfter the upgrade, it's time to install the main KXStudio packages.Just like you did to install the 'kxstudio-repos' package, now install:For KDE4 -> 'kxstudio-desktop-kde4'For XFCE -> 'kxstudio-desktop-xfce'For other systems install 'kxstudio-desktop-base' and the ubuntu related package, like 'lubuntu-desktop' for LXDEStep 4 - Install the Multimedia SoftwareThis step if almost optional. Here we install the basic software for Audio, Graphics and Video.Just like before, it's time to install some new meta-packages. They are available as listed here (following a tree view of dependencies):kxstudio-meta-all    kxstudio-meta-audio        kxstudio-meta-audio-plugins            kxstudio-meta-audio-plugins-dssi            kxstudio-meta-audio-plugins-ladspa            kxstudio-meta-audio-plugins-lv2            kxstudio-meta-audio-plugins-vamp            kxstudio-meta-audio-plugins-vst    kxstudio-meta-graphics    kxstudio-meta-videokxstudio-meta-codecskxstudio-meta-restricted-extraskxstudio-meta-non-freeInstall the meta-packages you want just like before (ie, search for the package and click to install, or use in command-line: sudo apt-get install )See Documentation:Ubuntu:Meta-Packages for a description of these meta-packages.Note - meta-all recommends restricted extras, and audio recommends audio-plugins.Step 5 - Install a KernelThis step was required in my case. And the generic kernel was not enough. I had to install kxstudio-kernel-lowlatency.Installing a kernel in KXStudio couldn't be easier - just install one of these packages:kxstudio-kernel-generickxstudio-kernel-generic-pae (32bit only)kxstudio-kernel-lowlatencykxstudio-kernel-lowlatency-pae (32bit only)kxstudio-kernel-realtime (10.04 or 12.04)kxstudio-kernel-realtime-pae (10.04 or 12.04, 32bit only)The realtime kernels are only available for 10.04 and 12.04.Ubuntu 10.04 uses a 2.6.33 RT kernel and 12.04 uses a 3.2.0 one.Step 6 - Reboot and update settingsAfter all this, it's time to reboot.The next time you login, you'll see the KXStudio Welcome Screen to help you update your settings (and maybe the theme too).You should also run 'cadence' and change your JACK settings to your preference.Finally, just re-login again after updating the settings.Step 7 - Enjoy!Of course, now it's time to enjoy! 