path: root/sound/drivers
diff options
authorLinus Torvalds <>2010-08-07 17:07:31 -0700
committerLinus Torvalds <>2010-08-07 17:07:31 -0700
commitfaa38b5e0e092914764cdba9f83d31a3f794d182 (patch)
treeb3e5921bdc36378033b4910eb4f29cb0dfc486e0 /sound/drivers
parent78417334b5cb6e1f915b8fdcc4fce3f1a1b4420c (diff)
parent74bf40f0793fed9e01eb6164c2ce63e8c27ca205 (diff)
Merge branch 'for-linus' of git://
* 'for-linus' of git:// (214 commits) ALSA: hda - Add pin-fix for HP dc5750 ALSA: als4000: Fix potentially invalid DMA mode setup ALSA: als4000: enable burst mode ALSA: hda - Fix initial capsrc selection in patch_alc269() ASoC: TWL4030: Capture route runtime DAPM ordering fix ALSA: hda - Add PC-beep whitelist for an Intel board ALSA: hda - More relax for pending period handling ALSA: hda - Define AC_FMT_* constants ALSA: hda - Fix beep frequency on IDT 92HD73xx and 92HD71Bxx codecs ALSA: hda - Add support for HDMI HBR passthrough ALSA: hda - Set Stream Type in Stream Format according to AES0 ALSA: hda - Fix Thinkpad X300 so SPDIF is not exposed ALSA: hda - FIX to not expose SPDIF on Thinkpad X301, since it does not have the ability to use SPDIF ASoC: wm9081: fix resource reclaim in wm9081_register error path ASoC: wm8978: fix a memory leak if a wm8978_register fail ASoC: wm8974: fix a memory leak if another WM8974 is registered ASoC: wm8961: fix resource reclaim in wm8961_register error path ASoC: wm8955: fix resource reclaim in wm8955_register error path ASoC: wm8940: fix a memory leak if wm8940_register return error ASoC: wm8904: fix resource reclaim in wm8904_register error path ...
Diffstat (limited to 'sound/drivers')
1 files changed, 21 insertions, 3 deletions
diff --git a/sound/drivers/Kconfig b/sound/drivers/Kconfig
index c290cee4cee8..480c38623da8 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.
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.