On Tue, Aug 11, 2020 at 11:54:38AM -0500, Pierre-Louis Bossart wrote:

> > constraint logic needs to know about this DSP limitation - it seems like
> > none of this is going to change without something new going into the
> > mix?  We at least need a new question to ask about the DSP firmware I
> > think.

> I just tested aplay -Dhw: on a Cyan Chromebook with the Ubuntu kernel 5.4,
> and I see no issues with the 240 sample period. Same with 432, 960, 9600,
> etc.

> I also tried just for fun what happens with 256 samples, and I don't see any
> underflows thrown either, so I am wondering what exactly the problem is?
> Something's not adding up. I would definitively favor multiple of 1ms
> periods, since it's the only case that was productized, but there's got to
> me something a side effect of how CRAS programs the hw_params.

Is it something that goes wrong with longer playbacks possibly (eg,
someone watching a feature film or something)?