[alsa-devel] Constant noise on HDA ALC275

[Julien Danjou]

Hi there,

I've an HDA based chipset in a new Sony Vaio Z (Ivy Bridge). As sound as
the system starts and the sound module are loaded, there's a constant
noise (shhhhhhht) in the speakers. The noise change a bit if I toggle
the mute button, but it's still there.

This noise stops as sound as I plug something in the jack port.

I've tried to play with HDA Analyzer¹, but I've no clue what to look
for, so any hint appreciated.

Some information:

00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)

% aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC275 Analog [ALC275 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

% lsmod | grep snd
snd_hda_codec_hdmi     30783  1 
snd_hda_codec_realtek    50906  1 
snd_hda_intel          26504  3 
snd_hda_codec          83533  3 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_intel
snd_hwdep              13186  1 snd_hda_codec
snd_pcm                64080  3 snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel
snd_page_alloc         12969  2 snd_pcm,snd_hda_intel
snd_seq                45130  0 
snd_seq_device         13176  1 snd_seq
snd_timer              22917  2 snd_pcm,snd_seq
snd                    53077  15 snd_hda_codec_realtek,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_hda_codec,snd_hda_intel,snd_seq_device
soundcore              13026  1 snd


/proc/asound/card0/codec#0
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/proc/asound/card0/codec#3
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¹  http://www.alsa-project.org/main/index.php/HDA_Analyzer

-- 
Julien Danjou
# Free Software hacker & freelance
# http://julien.danjou.info
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