[alsa-devel] alsactl restore: unknown hardware: ymf724f

Angel Tsankov fn42551 at fmi.uni-sofia.bg
Sat Feb 27 15:46:12 CET 2010

Raymond Yau wrote:
> 2010/2/27 Angel Tsankov <fn42551 at fmi.uni-sofia.bg>
>> I'd also like to point out that in /etc/asound.state the values for
>> control.48 are the maximum possible (if I interpret the values right),
>> but when I stored the levels neither master, nor PCM was set to its
>> maximum value.
>> Regards,
>> Angel Tsankov
> That is the per voice volume control which use the hardware mixer in ymf754

The device in question is YMF724F.

> chip instead of the mixer of ac97 codec
> ymf754 has 32 playback subdevices , each subdevices has one hardware mixer
> volume control
> the values are set to 0dB by the driver when the subdevice is open , DSP can
> mix 32 streams by hardware
> when  the driver is loaded there are 32 controls which are inactive and the
> total number of controls should more that those controls in asound.state
> since those iface PCM "PCM playback volume controls" are not saved at
> shutdown because all 32 controls are inactive when 32 subdevices are closed

Angel Tsankov

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