[alsa-devel] Thinkpad T520 (Low Volume)

[Takashi Iwai]

At Sat, 18 Jan 2014 09:46:22 +0800,
Raymond Yau wrote:
> 
> > 2014/1/16 Axel Braun <axel.braun at gmx.de>
> 
> > same problem on a ThinkPad T520, sound volume is way
> too low - watching movie via loudspeakers is fairly impossible.
> > Any hint you could give me?
> >
> > post the output of alsa-info.sh , there is a bug in alsa-driver which
> treat
> > dock headphone and headphone to support surround 4.0
> 
> 
> 
> you get low volume because Amp Out vals are 0x3d instead of 0x4a but
> speaker volumes are at 100% (0dB)
> 
> Simple mixer control 'Speaker',0
>   Capabilities: pvolume pswitch
>   Playback channels: Front Left - Front Right
>   Limits: Playback 0 - 74
>   Mono:
>   Front Left: Playback 74 [100%] [0.00dB] [on]
>   Front Right: Playback 74 [100%] [0.00dB] [on]
> 
> Node 0x10 [Audio Output] wcaps 0xc1d: Stereo Amp-Out R/L
>   Control: name="Speaker Playback Volume", index=0, device=0
>     ControlAmp: chs=3, dir=Out, idx=0, ofs=0
>   Control: name="Speaker Playback Switch", index=0, device=0
>     ControlAmp: chs=3, dir=Out, idx=0, ofs=0
>   Device: name="CX20590 Analog", type="Audio", device=0
>   Amp-Out caps: ofs=0x4a, nsteps=0x4a, stepsize=0x03, mute=1
>   Amp-Out vals:  [0x3d 0x3d]

Master is set to -13dB, so this is normal.


Takashi