[Bug 218544] not enough bandwidth, synaptics hi-res audio duplex audio

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218544

--- Comment #11 from Alan Stern (stern@rowland.harvard.edu) ---
The most obvious difference is that the "good" device requires only 85 us/frame
for its audio-in channel whereas the "bad" device requires 234 us/frame.  This
is the difference between 16-bit and 24-bit captures that you mentioned
originally.  (The 39 vs. 24 for the interrupt endpoint wouldn't have a
significant effect.)  There could be other factors in play, but that difference
is likely enough to tip the balance.

The times in the bandwidth file indicate that audio subsystem is using the
device's higher bandwidth setting.  Using the lower bandwidth setting instead
could well make a difference.  I don't know how to tell the sound interface to
do this; maybe Takashi can say.

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