On Sun, 30 Nov 2003, Eduard Bloch wrote:
> Hello,
>
> I have some problems with a ac97 based sound card (Notebook built-in)
> where the kernel driver works fine (except of not beeing able to
> resample on-the-fly).
>
> When I set the PCM mixer volume to more then 50%, I hear few sound
> fragments. If I go over 75% I hear them all the time and on 100% PCM,
> the sound is full of scratching fragments. You can get an example
> catched with microphone on
> http://sites.inka.de/W1752/alsa-distortion.ogg and the original is on
> www.vorbis.com/music/Mists_of_Time-4T.ogg . First I suspected a speaker
> problem since it sounds very similar to overloud speaker setting, but it
> is not!
Are you sure that you don't have enable any other analog input? My
notebook has very noisy build-in microphone for example.
Also note that if you have value over 70% with most of AC'97 controls, the
analog gain is applied to the signal (thus you can really overdrive the
output or input).
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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