[alsa-devel] question on alsa's kernel API concerning snd_power_change_state()
tiwai at suse.de
Thu Nov 24 09:55:38 CET 2011
At Thu, 24 Nov 2011 09:28:02 +0100,
Oliver Neukum wrote:
> if this function has been used to tell the sound core that a device
> is in a powersave mode, will the soundcore allow user space to open it?
Yes. Some operations (typically ioctl, read, write) are blocked when
the mode is set to D3 until snd_power_change_state(D0) is called. But
the open itself isn't blocked.
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