Re: Small instrument hardware module

Kazakore <dj_kaza@xxxxxxxxxxx> · Wed, 22 Oct 2014 09:59:45 +0800



    On 22/10/14 04:15, Len Ovens wrote:

    
    On Tue, 21 Oct 2014, Harry van Haaren wrote:
      

      Hey all,
        

        I have a HDA ( cat /proc/interrupts tells me so anyway:
        snd_hda_intel ).
        

        Its my built-in laptop soundcard, and it works pretty well, down
        to about 44.1kHz, -p128
        

        -n3. That's ~8ms, which is acceptable IMO.
        

        I've read on mailing list / internet somewhere* that spec for
        the HDA is pretty
        

        open-to-interpretation, so I think the exact hardware / chipset
        would need to be tested
        

        to get true results.
        

    This is also what I was lead to believe. snd_hda_intel covers a fair
    range of different chips, each of which has its own characteristics
    and so there is no single answer to the original question. Pretty
    sure both my last two laptops were reported as snd_hda_intel and
    know they were definitely different sound chips! (Although offhand
    couldn't tell you what...)

    
    "Like AC'97, HD Audio is a specification that defines the
    architecture, link frame format, and programming interfaces used by
    the controller on the PCI bus and by the codec on the other
    side of the link. Implementations of the host controller are
    available from at least Intel,
    Nvidia,
    and AMD."
    [1]

    
    I have gotten 48k -p64 -n3 on mine. Jack will crash if
      I try -p64 -n2, but -p128 -n2 works.
      

      From my reading, HDA is (like AC97) more of a bus spec than a
      sound spec. It seems to deal with connecting the sound from the HW
      to the internal bus. The HDA bus runs at 48K (like AC97) but does
      not expect the HW to be 48k (as AC97 did) and has methods for
      transporting audio with other sample rates than 48K.
      

      In my opinion, 128/2 is just on the edge of useful for live
      (guitarix for example) use. 256/2 is annoying already. (No I do
      not play play really fast or anything like that)
      

    With no careful tuning I run my internal at 48k -p128 -n3  and get
    rare xruns, mostly if I have my wifi turned on but still the very
    occasional one otherwise.

    
    Not sure if there is a mistake on the page or if my laptop actually
    has both of these for something?? [2]

    Intel
        7 Series/C210 Series Chipset Family High Definition Audio
        Controller

      Intel
        Panther Point High Definition Audio Controller 

    
    [1] http://en.wikipedia.org/wiki/Intel_High_Definition_Audio

    [2]
    http://www.ubuntu.com/certification/hardware/201206-11273/components/

  
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@xxxxxxxxxxxxxxxxxxxx
http://lists.linuxaudio.org/listinfo/linux-audio-user