diff options
Diffstat (limited to 'sound/drivers')
-rw-r--r-- | sound/drivers/Kconfig | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/sound/drivers/Kconfig b/sound/drivers/Kconfig index 84714a65e5c8..32646000ab90 100644 --- a/sound/drivers/Kconfig +++ b/sound/drivers/Kconfig | |||
@@ -170,9 +170,25 @@ config SND_AC97_POWER_SAVE | |||
170 | AC97 codecs. In this mode, the power-mode is dynamically | 170 | AC97 codecs. In this mode, the power-mode is dynamically |
171 | controlled at each open/close. | 171 | controlled at each open/close. |
172 | 172 | ||
173 | The mode is activated by passing power_save=1 option to | 173 | The mode is activated by passing 'power_save=X' to the |
174 | snd-ac97-codec driver. You can toggle it dynamically over | 174 | snd-ac97-codec driver module, where 'X' is the time-out |
175 | sysfs, too. | 175 | value, a nonnegative integer that specifies how many |
176 | seconds of idle time the driver must count before it may | ||
177 | put the AC97 into power-save mode; a value of 0 (zero) | ||
178 | disables the use of this power-save mode. | ||
179 | |||
180 | After the snd-ac97-codec driver module has been loaded, | ||
181 | the 'power_save' parameter can be set via sysfs as follows: | ||
182 | |||
183 | echo 10 > /sys/module/snd_ac97_codec/parameters/power_save | ||
184 | |||
185 | In this case, the time-out is set to 10 seconds; setting | ||
186 | the time-out to 1 second (the minimum activation value) | ||
187 | isn't recommended because many applications try to reopen | ||
188 | the device frequently. A value of 10 seconds would be a | ||
189 | good choice for normal operations. | ||
190 | |||
191 | See Documentation/sound/alsa/powersave.txt for more details. | ||
176 | 192 | ||
177 | config SND_AC97_POWER_SAVE_DEFAULT | 193 | config SND_AC97_POWER_SAVE_DEFAULT |
178 | int "Default time-out for AC97 power-save mode" | 194 | int "Default time-out for AC97 power-save mode" |
@@ -182,4 +198,6 @@ config SND_AC97_POWER_SAVE_DEFAULT | |||
182 | The default time-out value in seconds for AC97 automatic | 198 | The default time-out value in seconds for AC97 automatic |
183 | power-save mode. 0 means to disable the power-save mode. | 199 | power-save mode. 0 means to disable the power-save mode. |
184 | 200 | ||
201 | See SND_AC97_POWER_SAVE for more details. | ||
202 | |||
185 | endif # SND_DRIVERS | 203 | endif # SND_DRIVERS |