[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]

Garnet MacPhee wrote:
> 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.
> > 
> > We need something like the following (untested), unless you have a better
> > idea:
> 
> I retro-fitted Clemens' patch to kernel 2.6.35 and tested it. There is
> a problem in card.c and endpoint.c in that KERN_WARN needs to be
> KERN_WARNING,

That's why I wrote "untested".  :-)

> but otherwise the patch works. I get this in dmesg:
> 
> ALSA sound/usb/endpoint.c:279: 2:1:1: unknown interface protocol 0xff, assuming v1
> ALSA sound/usb/endpoint.c:439: 2:1:1: add audio endpoint 0x1
> ALSA sound/usb/endpoint.c:279: 2:2:1: unknown interface protocol 0xff, assuming v1
> ALSA sound/usb/endpoint.c:439: 2:2:1: add audio endpoint 0x81
> ALSA sound/usb/endpoint.c:279: 2:2:2: unknown interface protocol 0xff, assuming v1
> ALSA sound/usb/endpoint.c:439: 2:2:2: add audio endpoint 0x81
> ALSA sound/usb/clock.c:243: current rate 48000 is different from the runtime rate 96000
> 
> It is still necessary to have the following bit of code in endpoint.c,
> otherwise sample rates of 44100 or 88200 do not work (the original
> problem).

The sample rate problems are handled by Felix' patch, which I applied
yesterday.

All known FTU problem should now be fixed in the alsa-kernel tree.


Regards,
Clemens