[alsa-devel] [PATCH 6/6 v3] ASoC: rsnd: Add Volume Ramp support

[Mark Brown]

On Tue, Nov 04, 2014 at 08:29:53PM -0800, Kuninori Morimoto wrote:

> amixer set "DVC Out" 100%      // = Normal Volume
> amixer set "DVC Out Ramp Up Rate"   "0.125 dB/64 steps"
> amixer set "DVC Out Ramp Down Rate" "0.125 dB/512 steps"
> amixer set "DVC Out Ramp" 0%   // Mute = Normal Volume x 0%
> amixer set "DVC Out Ramp" on   // Volume Ramp ON
> aplay xxx.wav &
> amixer set "DVC Out Ramp" 100% // Mute to Normal Volume x 100%
> amixer set "DVC Out Ramp" 0%   // Normal Volume x 100% to Mute

Correct me if I'm wrong but I think what's confusing me here is that
what I'd expect to happen is that setting the ramp rate would cause any
volume change done by the user to ramp to the target volume (or mute)
but it looks like what's actually happening is that the ramp control is
providing an additional layer of volume control on top of the normal
volume control.
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