[alsa-devel] High-pitched noise on output from cmi9739 (snd_intel8x0)
mark473 at gmail.com
Sat Jun 30 12:57:43 CEST 2007
I have a cmi9739 (sis7012) built into an asus k7s8x motherboard which
produces a quiet but noticeable noise on top of the regular output
(the noise only occurs during playback).
I logged a bug to alsa's bugtrack:
(https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2288) about a
year ago, but unfortunately I still have the problem with alsa release
To try to find out what's going on, I tried using seven (7) different
drivers for this soundcard (both Linux and Windows XP) to find out
when the problem occurs. Here's the results:
a) Alsa (snd_intel8x0) version 1.0.14 under Ubuntu 7.10 alpha 2. Problem EXISTS.
b) OSS 4Front Opensound v4.1 (v4.1test0-070624). Problem EXISTS
c) CMedia Linux OSS driver cmaudio-070 (from
http://www.cmedia.com.tw). Problem EXISTS.
d) Windows XP "built-in" driver for SiS 7012 version 22.214.171.12420.
e) Windows XP drivers from Asus website for SiS 7012 version
126.96.36.199. Problem DOES NOT EXIST.
f) Windows XP drivers from CMedia website (http://www.cmedia.com.tw)
version 188.8.131.52. Problem DOES NOT EXIST.
g) Windows XP drivers from CMedia forum
184.108.40.206. Problem DOES NOT EXIST.
Given that the problem does not happen with three out of the seven
drivers, I assume it's a driver problem. Is there anything that I can
do debug this further?
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