At Thu, 15 Jul 2010 09:36:23 +0200 (CEST), Jiri Kosina wrote:

On Wed, 14 Jul 2010, Michael Witten wrote:

...

The description has been expanded to explain the time-out value provided by the power_save module parameter.

Michael,

thanks a lot for the patch. I'd rather let it go through Takashi still anyway (added to CC).

The patch looks good.

Michael, could you repost so that I can apply it directly?

thanks,

Takashi

Thanks.

...

Signed-off-by: Michael Witten mfwitten@gmail.com

sound/drivers/Kconfig | 24 +++++++++++++++++++++--- 1 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/sound/drivers/Kconfig b/sound/drivers/Kconfig index 84714a6..3264600 100644 --- a/sound/drivers/Kconfig +++ b/sound/drivers/Kconfig @@ -170,9 +170,25 @@ config SND_AC97_POWER_SAVE AC97 codecs. In this mode, the power-mode is dynamically controlled at each open/close.

•  The mode is activated by passing power_save=1 option to
  

•  snd-ac97-codec driver.  You can toggle it dynamically over
  

•  sysfs, too.
  

•  The mode is activated by passing 'power_save=X' to the
  

•  snd-ac97-codec driver module, where 'X' is the time-out
  

•  value, a nonnegative integer that specifies how many
  

•  seconds of idle time the driver must count before it may
  

•  put the AC97 into power-save mode;  a value of 0 (zero)
  

•  disables the use of this power-save mode.
  

•  After the snd-ac97-codec driver module has been loaded,
  

•  the 'power_save' parameter can be set via sysfs as follows:
  

•    echo 10 > /sys/module/snd_ac97_codec/parameters/power_save
  

•  In this case, the time-out is set to 10 seconds; setting
  

•  the time-out to 1 second (the minimum activation value)
  

•  isn't recommended because many applications try to reopen
  

•  the device frequently.  A value of 10 seconds would be a
  

•  good choice for normal operations.
  

•  See Documentation/sound/alsa/powersave.txt for more details.
  
  

config SND_AC97_POWER_SAVE_DEFAULT int "Default time-out for AC97 power-save mode" @@ -182,4 +198,6 @@ config SND_AC97_POWER_SAVE_DEFAULT The default time-out value in seconds for AC97 automatic power-save mode. 0 means to disable the power-save mode.

•  See SND_AC97_POWER_SAVE for more details.
  

endif # SND_DRIVERS

1.7.2.rc1.9.g5b527

-- Jiri Kosina SUSE Labs, Novell Inc.