Hello,
I've recently bought a Focusrite Scarlett 18i8 3rd Gen audio interface, great device, but in CentOS 7, with either the available 3.x or 4.x kernels, the device just appears in the available Alsa devices, but no mixer is available, the device direct hardware monitor output is also not working (it is, by default, and works well in Windows, but I presume that w/ no mixer support in Alsa, it's expected that nothing works). I'm able to bound I/O ports in QJackCtl but nothing goes out of the device.
Of course, adding the 0x1235:8214 USB ID to the quirks just doesn't work. I presume there's more work like the patch submitted here (I saw the archives) in the "[PATCH RFC V2] ALSA: usb-audio: Scarlett Gen 2 mixer interface" mail thread?
Do you it is worth trying applying that 2nd Gen patch to one of the v4 kernel available for CentOS 7, adding the 3rd Gen quirks and see how it behaves? Or is there already progress on supporting the 3rd Gen one too?
Regards,