[alsa-devel] Constant noise on HDA ALC275

[Takashi Iwai]

At Fri, 21 Sep 2012 17:55:18 +0200,
Julien Danjou wrote:
> 
> On Fri, Sep 21 2012, Takashi Iwai wrote:
> 
> > Hm then I have no more clue.  Sony must have done something weird...
> 
> Too bad, but thanks a lot anyway for your help!

One last thing I'd try is to disable the analog loopback path

    hda-verb /dev/snd/hwC0D0 0x0d SET_AMP 0x7180

Other than that, only insane things like setting VREF to the output
pin (e.g. Apple machines need it) or trying some COEF used for other
devices.


Takashi