Re: audio volume much lower with kernel 3.15

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At Mon, 13 Oct 2014 23:25:10 +0300,
Nerijus Baliunas wrote:
> 
> On Wed, 03 Sep 2014 17:41:15 +0200 Takashi Iwai <tiwai@xxxxxxx> wrote:
> 
> > > > It's because the volume was overloaded in 3.14 and earlier.
> > > 
> > > I suspected so, because in Windows I get a lower volume too.
> > > 
> > > > It came through the mixer widget and it has the gain over 0dB.
> > > > If you set 100% amp in the pin and sets more than 0dB in the mixer,
> > > > it's basically more than 100%, overloading.
> > > > 
> > > > That is, the new driver corrected the wrong volume setup.
> > > 
> > > Is it possible to get the old volume level back by using a gnome/mate mixer
> > > (actually the volume buttons Fn+F7/F8)?
> > 
> > No, not in that way.  Also it's not good for your hardware.  It can
> > damage speakers easily.
> > 
> > If you still want it, you can touch directly the volume via hda-verb
> > command.  First, change "Loopback" mixer enum to "Enabled" (e.g. via
> > "alsamixer -c0").  Then change the amp of NID 0x17 to a higher value.
> > For example, to really full volume (0x2b, 0x14 is 0dB):
> >   hda-verb /dev/snd/hwC0D0 0x17 SET_AMP 0xb02b
> > 
> > But you were warned...
> 
> Thank you. I ran hda-verb /dev/snd/hwC0D0 0x17 SET_AMP 0xb02b (as root,
> because as a user I got permsision denied), but the volume did not increase:
> 
> # hda-verb /dev/snd/hwC0D0 0x17 SET_AMP 0xb02b
> nid = 0x17, verb = 0x300, param = 0xb02b
> value = 0x0
> 
> The only way to increase volume is to use vlc and set the volume to 125%, but
> it still too low and I can barely hear some movies. So is it possible to get the old
> 3.14 kernel volume back?

You can try to change other widget parameters to match with 3.14 via
hda-verb.  Basically it's just the amp setup in some widgets in the
playback path.


Takashi

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