Vladimir Komendantsky wrote: > 2009/11/23 Clemens Ladisch <clemens@xxxxxxxxxx>: > > Insufficient for what? MIDI and full duplex audio with 16 bits at > > 44.1 kHz work fine with full speed. > > Not quite. Counterexamples include mp3 playback (16 bit / 44.1 KHz or > less) from a computer to the audio interface (clicks and distorted > sound after several seconds - probably a buffer overflow symptom - > gets even worse after more time) and playing virtual instruments by > sending MIDI to a software synthesizer like fluidsynth, with audio > being sent back to the audio interface (clicks, delays, distortion). These problems are not related with bandwidth. To the same problems apprat when you connect the device to a computer without the vendor drivers? > > then this can > > only be enabled with some vendor-specific command. Documentation for > > that would be available (or not) only from M-Audio. > > I couldn't find any such documentation in the Internet. On their > support forum, I even saw a declaration by M-Audio that they offer no > specific Linux support. Should this command appear in USB traffic > logs? Yes. > How one proceeds when USB 2.0 is enabled? Should there be a forced > disconnection and reconnection of the device to an EHCI hub? Yes; from the point of view of the computer, the high-speed device is a completely different device that happens to be connected to the same port where the old full-speed device was previously. Best regards, Clemens -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
