At Sat, 30 Jun 2007 11:57:43 +0100, j t wrote: > > Hi all. > > 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 > 1.0.14 > > 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 5.10.0.6120. > Problem EXISTS. > > e) Windows XP drivers from Asus website for SiS 7012 version > 5.12.1.38. Problem DOES NOT EXIST. > > f) Windows XP drivers from CMedia website (http://www.cmedia.com.tw) > version 5.12.1.39. Problem DOES NOT EXIST. > > g) Windows XP drivers from CMedia forum > (http://www.cmedia.com.tw/forums) version > 5.12.1.51. 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? It's pretty hard to debug, I'm afraid, unless we know _what_ is the cause of the noise. Possibly we need some quirks for PCI setup (e.g. adjust latency via setpci), or it might be a confliction of cpufreq (disable the kernel config, or even try HZ=100), or any unknown hardware features... Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
