My Geek Pulse Signature DAC seems to be having similar issues as you're describing. It stopped working recently, having the same symptoms you're describing. I was wondering if you've resolved your issues? Was it hardware related? How did you solve it?
Awesome, this fixed it for me as well, contacted support, received v2.0 firmware for my Geek Pulse Signature. Works like a charm again.
I think I may have the same problem with my Pulse Fi, Is this Firmware update suitable. I just have a concern that it isn't my issue because Linux now won't recognise the pulse at all now. Windows does seem to recognise it, but no sound comes out. If anyone has any insight into this I would be grateful. This is my second pulse. The first was faulty, and I don't want to brick this one. Thank you.