Am Thu, 14 Aug 2014 17:11:32 +0200 schrieb Takashi Iwai tiwai@suse.de:
At Thu, 14 Aug 2014 17:04:59 +0200, Julian Wollrath wrote:
Am Thu, 14 Aug 2014 16:47:46 +0200 schrieb Takashi Iwai tiwai@suse.de:
At Thu, 14 Aug 2014 16:39:14 +0200, Julian Wollrath wrote:
Am Thu, 14 Aug 2014 16:09:51 +0200 schrieb Takashi Iwai tiwai@suse.de:
At Thu, 14 Aug 2014 16:07:37 +0200, Julian Wollrath wrote:
> > > > Simple mixer control 'Mic',0 > > > > Front Left: Playback 0 [0%] [-34.50dB] [on] > > > > Front Right: Playback 0 [0%] [-34.50dB] [on] > > > > > > This plays any noise from the mic input. > > Turning it off makes no difference since capture is > > turned off anyway: > > This is a loopback mixer element, it has nothing to do > with capture stream. > > The likely culprit of the static noises is the signal > from the analog loopback. In some cases, you can disable > the whole loopback via "Loopback Mixing" mixer element on > the fly. In some cases, you'd need to disable each mixer > input (e.g. "Mic Playback Switch"). In some cases (e.g. > on some Sony and Dell laptops), you'd need to disable the > complete analog loopback at the initialization. > > The last one can be done via the early patching or sysfs > reconfiguration, pass "mixer_nid = 0" hint. See > HD-Audio.txt for a brief instruction. Sadly, that did not help.
Give alsa-info.sh output after your change to verify whether you did correctly.
Here it is, cheers:
Thanks. The setup looks OK, the path is: DAC (0x02) -> mixer (0x0c) -> mixer (0x14) and the mixer mutes the loopback path (index 1).
Is it the state where you still hear the static noise?
Yes, the alsa-info.sh script was executed, while hearing the static noise.
OK. And if you mute "Speaker" or "Headphone", the noise is gone, too, right?
No, if I mute "Speaker" (the internal laptop speaker) it is not gone. It is only gone, if I mute "Master" or have a headphone plugged in and mute "Headphone" or "Master".
More fascinating, it is not present, if the speaker is not muted and I disable powersaving via "echo '0' > '/sys/module/snd_hda_intel/parameters/power_save'" but even then, it is still present on the headphone.
Also, what if you use the module option for snd-hda-intel model=nofixup or model=generic?
That did not change anything either. Passing the "mixer_nid = 0" hint also did not get rid of the static noise, when loading snd-hda-intel with model=nofixup resp. model=generic.
Did you reboot with setting the option in /etc/modprobe.d/*? Reloading the module might not work for such a problem.
No, I just unloaded every sound-related module and than loaded the module via "modprobe snd-hda-intel model=..." again.
In either way, there should be some difference in alsa-info.sh output, e.g. more (or less) mixer items with the model option.
The difference is their, all the "Dock ..." entries were missing, when loading with the model="..." option.
Cheers, Julian