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-rw-r--r--Documentation/laptops/thinkpad-acpi.txt47
1 files changed, 37 insertions, 10 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index 78e354b42f67..f2296ecedb89 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -920,7 +920,7 @@ The available commands are:
echo '<LED number> off' >/proc/acpi/ibm/led
echo '<LED number> blink' >/proc/acpi/ibm/led
-The <LED number> range is 0 to 7. The set of LEDs that can be
+The <LED number> range is 0 to 15. The set of LEDs that can be
controlled varies from model to model. Here is the common ThinkPad
mapping:
@@ -932,6 +932,11 @@ mapping:
5 - UltraBase battery slot
6 - (unknown)
7 - standby
+ 8 - dock status 1
+ 9 - dock status 2
+ 10, 11 - (unknown)
+ 12 - thinkvantage
+ 13, 14, 15 - (unknown)
All of the above can be turned on and off and can be made to blink.
@@ -940,10 +945,12 @@ sysfs notes:
The ThinkPad LED sysfs interface is described in detail by the LED class
documentation, in Documentation/leds-class.txt.
-The leds are named (in LED ID order, from 0 to 7):
+The LEDs are named (in LED ID order, from 0 to 12):
"tpacpi::power", "tpacpi:orange:batt", "tpacpi:green:batt",
"tpacpi::dock_active", "tpacpi::bay_active", "tpacpi::dock_batt",
-"tpacpi::unknown_led", "tpacpi::standby".
+"tpacpi::unknown_led", "tpacpi::standby", "tpacpi::dock_status1",
+"tpacpi::dock_status2", "tpacpi::unknown_led2", "tpacpi::unknown_led3",
+"tpacpi::thinkvantage".
Due to limitations in the sysfs LED class, if the status of the LED
indicators cannot be read due to an error, thinkpad-acpi will report it as
@@ -958,6 +965,12 @@ ThinkPad indicator LED should blink in hardware accelerated mode, use the
"timer" trigger, and leave the delay_on and delay_off parameters set to
zero (to request hardware acceleration autodetection).
+LEDs that are known not to exist in a given ThinkPad model are not
+made available through the sysfs interface. If you have a dock and you
+notice there are LEDs listed for your ThinkPad that do not exist (and
+are not in the dock), or if you notice that there are missing LEDs,
+a report to ibm-acpi-devel@lists.sourceforge.net is appreciated.
+
ACPI sounds -- /proc/acpi/ibm/beep
----------------------------------
@@ -1156,17 +1169,19 @@ may not be distinct. Later Lenovo models that implement the ACPI
display backlight brightness control methods have 16 levels, ranging
from 0 to 15.
-There are two interfaces to the firmware for direct brightness control,
-EC and UCMS (or CMOS). To select which one should be used, use the
-brightness_mode module parameter: brightness_mode=1 selects EC mode,
-brightness_mode=2 selects UCMS mode, brightness_mode=3 selects EC
-mode with NVRAM backing (so that brightness changes are remembered
-across shutdown/reboot).
+For IBM ThinkPads, there are two interfaces to the firmware for direct
+brightness control, EC and UCMS (or CMOS). To select which one should be
+used, use the brightness_mode module parameter: brightness_mode=1 selects
+EC mode, brightness_mode=2 selects UCMS mode, brightness_mode=3 selects EC
+mode with NVRAM backing (so that brightness changes are remembered across
+shutdown/reboot).
The driver tries to select which interface to use from a table of
defaults for each ThinkPad model. If it makes a wrong choice, please
report this as a bug, so that we can fix it.
+Lenovo ThinkPads only support brightness_mode=2 (UCMS).
+
When display backlight brightness controls are available through the
standard ACPI interface, it is best to use it instead of this direct
ThinkPad-specific interface. The driver will disable its native
@@ -1254,7 +1269,7 @@ Fan control and monitoring: fan speed, fan enable/disable
procfs: /proc/acpi/ibm/fan
sysfs device attributes: (hwmon "thinkpad") fan1_input, pwm1,
- pwm1_enable
+ pwm1_enable, fan2_input
sysfs hwmon driver attributes: fan_watchdog
NOTE NOTE NOTE: fan control operations are disabled by default for
@@ -1267,6 +1282,9 @@ from the hardware registers of the embedded controller. This is known
to work on later R, T, X and Z series ThinkPads but may show a bogus
value on other models.
+Some Lenovo ThinkPads support a secondary fan. This fan cannot be
+controlled separately, it shares the main fan control.
+
Fan levels:
Most ThinkPad fans work in "levels" at the firmware interface. Level 0
@@ -1397,6 +1415,11 @@ hwmon device attribute fan1_input:
which can take up to two minutes. May return rubbish on older
ThinkPads.
+hwmon device attribute fan2_input:
+ Fan tachometer reading, in RPM, for the secondary fan.
+ Available only on some ThinkPads. If the secondary fan is
+ not installed, will always read 0.
+
hwmon driver attribute fan_watchdog:
Fan safety watchdog timer interval, in seconds. Minimum is
1 second, maximum is 120 seconds. 0 disables the watchdog.
@@ -1555,3 +1578,7 @@ Sysfs interface changelog:
0x020300: hotkey enable/disable support removed, attributes
hotkey_bios_enabled and hotkey_enable deprecated and
marked for removal.
+
+0x020400: Marker for 16 LEDs support. Also, LEDs that are known
+ to not exist in a given model are not registered with
+ the LED sysfs class anymore.