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-rw-r--r--Documentation/laptops/thinkpad-acpi.txt19
1 files changed, 17 insertions, 2 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index 96687d0106a..bd87682103c 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1098,18 +1098,31 @@ Volume control
procfs: /proc/acpi/ibm/volume
This feature allows volume control on ThinkPad models with a digital
-volume knob, as well as mute/unmute control. The available commands are:
+volume knob (when available, not all models have it), as well as
+mute/unmute control. The available commands are:
echo up >/proc/acpi/ibm/volume
echo down >/proc/acpi/ibm/volume
echo mute >/proc/acpi/ibm/volume
+ echo unmute >/proc/acpi/ibm/volume
echo 'level <level>' >/proc/acpi/ibm/volume
The <level> number range is 0 to 14 although not all of them may be
distinct. The unmute the volume after the mute command, use either the
-up or down command (the level command will not unmute the volume).
+up or down command (the level command will not unmute the volume), or
+the unmute command.
+
The current volume level and mute state is shown in the file.
+You can use the volume_capabilities parameter to tell the driver
+whether your thinkpad has volume control or mute-only control:
+volume_capabilities=1 for mixers with mute and volume control,
+volume_capabilities=2 for mixers with only mute control.
+
+If the driver misdetects the capabilities for your ThinkPad model,
+please report this to ibm-acpi-devel@lists.sourceforge.net, so that we
+can update the driver.
+
There are two strategies for volume control. To select which one
should be used, use the volume_mode module parameter: volume_mode=1
selects EC mode, and volume_mode=3 selects EC mode with NVRAM backing
@@ -1450,3 +1463,5 @@ Sysfs interface changelog:
is deprecated and marked for removal.
0x020600: Marker for backlight change event support.
+
+0x020700: Support for mute-only mixers.