[alsa-devel] Need expert's advice - Fast Track Ultra (8R) dropping samples

[Clemens Ladisch]

Felix Homann wrote:
> Am 05.10.2010 09:21, schrieb Clemens Ladisch:
>> Felix Homann wrote:
>>> Trying to log the value of f reveals that retire_playback_sync_urb()
>>> doesn't seem to be called at all.
>> 
>> The entire function or that part of the code?
> 
> The entire function. I had placed a printk at the very beginning of 
> retire_playback_sync_urb() whose output doesn't show up.
> 
>> Anyway, please try the patch below, which makes the driver
>> autodetect the feedback format.  (The actual format can be
>> seen in /proc/asound/cardX/stream0 while running.)
> 
> Playback:
>    Status: Running
>      Interface = 1
>      Altset = 1
>      URBs = 3 [ 57 57 57 ]
>      Packet Size = 312
>      Momentary freq = 48000 Hz (0x6.0000)
>    Interface 1
>      Altset 1
>      Format: S24_3LE
>      Channels: 8
>      Endpoint: 1 OUT (ADAPTIVE)
>      Rates: 44100, 48000, 88200, 96000
>      Data packet interval: 125 us
> 
> Does it tell us anything?

That this device does not use frequency feedback.

What happens when you are recording something and then try to play
something else with a different sample rate? (use arecord/aplay with
"-D hw:X")


Regards,
Clemens