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authorMichael Witten <mfwitten@gmail.com>2010-07-14 19:54:21 -0400
committerTakashi Iwai <tiwai@suse.de>2010-07-15 07:43:44 -0400
commit1d8c1100fbf956b9c5994077a4d3c6490c23e087 (patch)
tree6562aca545800135b7c334a465c3ff792552a5fb /sound
parent992cbf743862916dfbfdd3238fe3fecffbab5dd3 (diff)
ALSA: Kconfig: SND_AC97_POWER_SAVE description improvement
The description has been expanded to explain the time-out value provided by the power_save module parameter. Signed-off-by: Michael Witten <mfwitten@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/drivers/Kconfig24
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
177config SND_AC97_POWER_SAVE_DEFAULT 193config 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
185endif # SND_DRIVERS 203endif # SND_DRIVERS