https://bugzilla.kernel.org/show_bug.cgi?id=219111 --- Comment #28 from Alan Stern (stern@xxxxxxxxxxxxxxxxxxx) --- As I understand it, each audio channel gets transported over its own USB endpoint. (This is true for both mono channels and stereo channels.) So two stereo-in channels require two endpoints, and two stereo-out channels would require an additional two endpoints. Similarly, four in channels would require four endpoints. Maybe my understanding is wrong; I'll have to read through the USB Audio Class specification to make sure. The usbmon trace and the Wireshark log you attached both mention only two endpoints. Can you get a Wireshark trace showing what happens when you transmit or receive data over two in channels and two out channels (so using four endpoints) all at the same time? Also, can you attach a copy of the "lsusb -v" output for the device when it is attached with old_scheme_first set to Y? -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
