[AG-TECH] HD audio & USB audio on Linux?

[Douglas Kosovic]

Hi Andrew,

> I can't get RAT to work with the integrated HD audio chipset in some of 
> our machines - listen works but talk doesn't. I was pretty much 
> expecting this running on Linux (Ubuntu 7.10), partially since it's a 
> known problem on Windows. I'm wondering if anyone has actually gotten 
> these chipsets to work on any platform (is there any progress from 
> SUMOVER as far as supporting them?), and if not, what USB audio 
> interfaces work well with RAT on linux? I've been looking at the Edirol 
> UA-25 or 5, which are confirmed to work with the usb-audio module but I 
> don't know whether RAT supports something like that. Anyone have any 
> recommendations?

The RealTek HD audio was the only Intel HD codec/chips that had issues 
with WinXP because the Intel HD driver appeared as separate input and 
output devices. I have since modified the VIC code to add Realtek HD 
support and the RAT that ships with AG 3.1 includes it.

There must be at least a 100 different chips supported by the ALSA Intel 
HD drivers. With some of the chips, you need to be running the later 
ALSA driver and occasionaly there are bugs. Does the ALSA audio input on 
your PC work with any application? Try 'alasmixer -V all' and ensure 
you've enabled/selected the correct input.

As with Intel's AC'97, enable force AC'97 in the AG Audio Service. Also 
try switching between OSS and Alsa in RAT.



Doug