> Thank you for the detailed analysis. Excuse my ignorance, but do you > have an idea, what this Sennheiser USB headset does differently than > other USB devices? It uses isochronous out transfers, which off the top of my head are almost only used for audio playback in the real world. However, I don't know what it is doing differently from your other USB headset. A few random hypotheses: - the other is not a "full speed" device (but it most likely is) - you haven't tried enough times to reproduce the bug - you have some software which automatically starts playback to the Sennheiser when it's connected, but not to the other headset - different playback format and different USB packet size, although 192B/ms corresponds to 16 bit 48kHz stereo - the most comomn format. As for your bugzilla comment and the list of other TRB mismatch errors on linux-hardware - yes, these things happen due to a variety of bugs in host controllers and the driver. They are not all the same bug and they can't be analyzed or fixed if people don't report them and don't cooperate in debugging. These messages alone don't provide information about what specifically went wrong and under which circumstances. Regards, Michal
