On Tue, May 15, 2012 at 9:28 AM, Ignas Anikevicius <anikevic...@gmail.com> wrote: > Dear all, > > It's been quite a while since I noticed this annoying behaviour, but I > could not find any information what might cause this. So the problem is > that at lower volumes my HD-Audio with Conexant becomes very noisy and > this is regardless of the sound system or speakers/headphones I use. > > The noise can be described, as high pitched, sandy texture noise > heard during more expressive parts of the music or speech. > > I experience this on two Thinkpads (x200s and x200) and it very evident > when I connected external speakers, they produced a lot of this noise, > or maybe I just could hear it better, because of the frequency response > of the speakers. > > Does anybody have some similar issues? > > My current audio setup: > > * PulseAudio (but the problem is experienced with ALSA as well) > * MPD for music playing > * Conexant and other related modules compiled in, power-saving > features enabled. > > What I have tried to eliminate the noise: > > * Various levels of Master,PCM,Headphone channels via Alsamixer > * Increase the sample rate in MPD settings. > > The noise can be clearly head when I Have the following setting on my > Alsamixer: > > * Master ~50 > * PCM 100 > * Headphone 100 > > Does anybody has any thoughts on why am I experiencing this? > > Thanks a lot, > Ignas A. >
Hi Ignas, I've never used pulse-audio so I cannot help with that, but with plain Alsa I had a similar (but not identical) problem recently. In my case the distorted sound was primarily from my microphone and not, as I remember it, from playback. Turned out it was a control I hadn't looked at before called 'Digital' which apparently mixes audio in the sound chip and for whatever reason was very dirty sounding on the mic side. Note that my audio is not Conextent but rather something called SupremeFX X-Fi (Creative Labs maybe?) so your results will almost certainly vary. A little machine info is below. Good luck, Mark c2stable ~ # lspci | grep Audio 00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 Family) HD Audio Controller 02:00.1 Audio device: nVidia Corporation GF100 High Definition Audio Controller (rev a1) 04:00.1 Audio device: nVidia Corporation High Definition Audio Controller (rev a1) c2stable ~ # c2stable ~ # lsmod Module Size Used by vmnet 32295 15 vmblock 9667 0 vsock 35510 2 vmci 55922 2 vsock vmmon 56524 5 vboxnetadp 4720 0 vboxnetflt 13187 0 vboxdrv 1760740 3 vboxnetadp,vboxnetflt nvidia 12297407 104 snd_hda_codec_hdmi 22531 8 snd_hda_codec_analog 80332 1 sky2 42693 0 i2c_i801 7674 0 snd_hda_intel 21907 17 snd_hda_codec 73637 3 snd_hda_codec_hdmi,snd_hda_codec_analog,snd_hda_intel snd_hwdep 5508 1 snd_hda_codec snd_pcm 74632 7 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec snd_timer 18381 5 snd_pcm snd 58592 33 snd_hda_codec_hdmi,snd_hda_codec_analog,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer soundcore 6750 1 snd snd_page_alloc 7340 2 snd_hda_intel,snd_pcm agpgart 31204 1 nvidia c2stable ~ #
