[alsa-devel] [RESENT] [PATCH - Fix Fast Track Ultra series: 44.1/88.1 kHz 1/Fix playback/capture issues and related chrashes at 44100 Hz and 88200 Hz for M-Audio Fast Track Ultra series.

[Clemens Ladisch]

Daniel Mack wrote:
> On Thu, Sep 02, 2010 at 01:13:48PM +0200, Clemens Ladisch wrote:
> > I've got several reports that devices no longer work since UAC2 support got
> > added.  But I've just noticed this is not related to the interface class
> > but to the interface protocol: the new code added checks for UAC_VERSION_1
> > or _2, but real devices apparently write just random junk into this field.
> > (For vendor-specific interfaces, they are actually justified to do so.)
> 
> Grr. So what about cases where this "random junk" is 0x20 by coincidence?

Actually, it isn't too random: I've seen 0xff (obviously "vendor-
specific") and 0x01/0x02 (interface subclass moved to protocol).


Regards,
Clemens