dmasound_pmac in 2_4_devel

Benjamin Herrenschmidt benh at
Mon Nov 5 18:43:12 EST 2001

>I'm doing work that requires sound input.  In order to use the built-in
>microphone on my iMac (screamerawacs) I compiled the current 2_4_devel
>source, which has Iain Sandoe's dmasound_pmac patches. There were several
>issues I hope to resolve.
>I found a very audible clicking and popping during audio playback.  This
>is noticeable e.g. when playing normal MP3 files with xmms.  The clicking
>does not occur with the driver in the (non-devel) 2_4 tree.  I also had
>some programs lock up while playing sound.
>There were some other sound problems I haven't tracked down yet.  Before I
>continue working on this, I'd like to find out who is actively working on
>the dmasound_pmac driver, and where I can get more information.  I'm
>willing to work on the driver, but I'm new to the code and could use some
>help getting started.

I don't think anybody is actively working on it, I'm doing some
maintainance work. It's possible that the semaphore I added to
protect the entire driver is causing some latency, thus intruducing
the clicking. Did you try using more buffers ?


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