On Wed, 22 Oct 2014, Kazakore wrote:
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]
Ok, that sounds prettier than what I said :) the reason I called it a bus though is that one HDA interface seems to be able to handle a number of physical audio devices. Each of which can have a different bit depth and sample rate at the same time (say what?) so that the user could have a telephone handset hooked up to the interface at 32k/8bits while listening to/watching a high definition video. I don't know that Linux can handle this though. (or windows for that matter) I am just repeating some of the stuff I remember from reading though some of the very long and involved Intel Doc.
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
It may have both on the same PCI IF even. cat /proc/interupts should tell I think. As a note. On my netbook, the audio IF can run at a number of sample rates with no problems, but my internal mic which shows up on the same ALSA device, can only run at 48k. That is the ADC for the internal mic only runs at 48k and if the rest of the internal audio (internal speakers, line in/out plugs, are set to 44.1k, those i/os will be fine, but the internal mic will have a periodic click as the 44.1 and 48k sample rates align and cycle past each other. The click goes away if the AI is set to 48K.
Be sure to look at the variety of HDA IF types the ALSA driver handles and all of the settings that can be given to the HDA driver. It is quite a long list.
-- Len Ovens www.ovenwerks.net _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
