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-rw-r--r--Documentation/laptops/thinkpad-acpi.txt25
1 files changed, 20 insertions, 5 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index a41bc893f8d6..af1f2bcb6f66 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -693,16 +693,31 @@ while others are still having problems. For more information:
https://bugs.freedesktop.org/show_bug.cgi?id=2000
-ThinkLight control -- /proc/acpi/ibm/light
-------------------------------------------
+ThinkLight control
+------------------
+
+procfs: /proc/acpi/ibm/light
+sysfs attributes: as per led class, for the "tpacpi::thinklight" led
+
+procfs notes:
-The current status of the ThinkLight can be found in this file. A few
-models which do not make the status available will show it as
-"unknown". The available commands are:
+The ThinkLight status can be read and set through the procfs interface. A
+few models which do not make the status available will show the ThinkLight
+status as "unknown". The available commands are:
echo on > /proc/acpi/ibm/light
echo off > /proc/acpi/ibm/light
+sysfs notes:
+
+The ThinkLight sysfs interface is documented by the led class
+documentation, in Documentation/leds-class.txt. The ThinkLight led name
+is "tpacpi::thinklight".
+
+Due to limitations in the sysfs led class, if the status of the thinklight
+cannot be read or if it is unknown, thinkpad-acpi will report it as "off".
+It is impossible to know if the status returned through sysfs is valid.
+
Docking / undocking -- /proc/acpi/ibm/dock
------------------------------------------