At Thu, 30 Sep 2010 23:18:51 +0600, Valentine Sinitsyn wrote: > > Hello, > > I happened to spend last couple of evenings figuring out what's wrong with > microphone on my laptop (Lenovo Y550P, in case you are interested in). It > has Intel HDA soundcard with Realtek 272 codec. No, I'm not going to ask for > a help on devel mailing list, at the very least because I know what's wrong > myself. But this knowledge poses some questions regarding snd-hda-intel > kenel driver (more precisely, patch_realtek.c, which is part of it) I want > to clarify. Anyway, sorry for the long intro :) > > It quickly appeared that AUD_IN widget of the codec (NID 0x09) has no way to > be unmuted - its input amplifier is muted at the very beginning of > alc662_init_verbs and is not connected to any ALSA control (maybe it > should). I remembered the mic was working some time ago, so I've skimmed > through kernel versions and found the offending commit: > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=cec27c891b805b2ab2302f9fcbdacb6f179ac0d4 > > One can clearly see from it that before it was applied (i.e. Linux 2.6.34), > this widget was unmuted in alc662_auto_init_verbs (thus it happened to every > auto-configured card, including mine), but it is not unmuted anymore (as far > as I can see, for any model except maybe ecs - I haven't dug into this too > much). > > The question is if it is intentional (i.e. there should be some ALSA switch > connected to 0x09 input amplifier) or is it a bug? If the NID 0x09 not controllable via a mixer element but it influences on the capture behavior, then it's a bug. The change above should influence only the default value, which will be usually overridden by alsactl, PA or whatever. Could you give alsa-info.sh output of your system? Run with --no-upload option and attach the output. thanks, Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
