Messages in this thread | | | Date | Wed, 08 Feb 2012 09:30:40 +0100 | From | Takashi Iwai <> | Subject | Re: [alsa-devel] [PATCH 1/6] hda_intel: Add Lynx Point HD Audio Controller DeviceIDs |
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At Wed, 8 Feb 2012 00:35:33 +0000, Heasley, Seth wrote: > > >> I'm also in favor of not rocking the boat, but I'm curious what > >changing this would entail, and what would be the advantage or rationale > >for making the change? > > > >Reading the LPIB register, and reading the DMA position buffer, are two > >different methods of reading the current playback (or recording) > >position, i e which sample is currently being played back. > > > >The problem is that some chipsets prefer one method over the other, i e, > >only one of the methods work reliably. And if the other method only > >breaks occasionally, this can be quite difficult to detect and track > >down - we will have users complaining about their audio sometimes either > >sounding distorted, maybe not working at all, or just once in a while > >glitches. All of these symptoms can have many causes, so deducing that > >to a broken playback position is time consuming. That's why I think it's > >worth the extra question, to get it right from the start. > > > >So...thanks in advance for looking it up for us? :-) > > I'm inquiring about it, but I can say that it seems to work just fine using the DMA position buffer.
OK, I merged the patch now as is. Please let me know if you find a problem.
thanks,
Takashi
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