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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:
920 echo '<LED number> off' >/proc/acpi/ibm/led 920 echo '<LED number> off' >/proc/acpi/ibm/led
921 echo '<LED number> blink' >/proc/acpi/ibm/led 921 echo '<LED number> blink' >/proc/acpi/ibm/led
922 922
923The <LED number> range is 0 to 7. The set of LEDs that can be 923The <LED number> range is 0 to 15. The set of LEDs that can be
924controlled varies from model to model. Here is the common ThinkPad 924controlled varies from model to model. Here is the common ThinkPad
925mapping: 925mapping:
926 926
@@ -932,6 +932,11 @@ mapping:
932 5 - UltraBase battery slot 932 5 - UltraBase battery slot
933 6 - (unknown) 933 6 - (unknown)
934 7 - standby 934 7 - standby
935 8 - dock status 1
936 9 - dock status 2
937 10, 11 - (unknown)
938 12 - thinkvantage
939 13, 14, 15 - (unknown)
935 940
936All of the above can be turned on and off and can be made to blink. 941All of the above can be turned on and off and can be made to blink.
937 942
@@ -940,10 +945,12 @@ sysfs notes:
940The ThinkPad LED sysfs interface is described in detail by the LED class 945The ThinkPad LED sysfs interface is described in detail by the LED class
941documentation, in Documentation/leds-class.txt. 946documentation, in Documentation/leds-class.txt.
942 947
943The leds are named (in LED ID order, from 0 to 7): 948The LEDs are named (in LED ID order, from 0 to 12):
944"tpacpi::power", "tpacpi:orange:batt", "tpacpi:green:batt", 949"tpacpi::power", "tpacpi:orange:batt", "tpacpi:green:batt",
945"tpacpi::dock_active", "tpacpi::bay_active", "tpacpi::dock_batt", 950"tpacpi::dock_active", "tpacpi::bay_active", "tpacpi::dock_batt",
946"tpacpi::unknown_led", "tpacpi::standby". 951"tpacpi::unknown_led", "tpacpi::standby", "tpacpi::dock_status1",
952"tpacpi::dock_status2", "tpacpi::unknown_led2", "tpacpi::unknown_led3",
953"tpacpi::thinkvantage".
947 954
948Due to limitations in the sysfs LED class, if the status of the LED 955Due to limitations in the sysfs LED class, if the status of the LED
949indicators cannot be read due to an error, thinkpad-acpi will report it as 956indicators 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
958"timer" trigger, and leave the delay_on and delay_off parameters set to 965"timer" trigger, and leave the delay_on and delay_off parameters set to
959zero (to request hardware acceleration autodetection). 966zero (to request hardware acceleration autodetection).
960 967
968LEDs that are known not to exist in a given ThinkPad model are not
969made available through the sysfs interface. If you have a dock and you
970notice there are LEDs listed for your ThinkPad that do not exist (and
971are not in the dock), or if you notice that there are missing LEDs,
972a report to ibm-acpi-devel@lists.sourceforge.net is appreciated.
973
961 974
962ACPI sounds -- /proc/acpi/ibm/beep 975ACPI sounds -- /proc/acpi/ibm/beep
963---------------------------------- 976----------------------------------
@@ -1156,17 +1169,19 @@ may not be distinct. Later Lenovo models that implement the ACPI
1156display backlight brightness control methods have 16 levels, ranging 1169display backlight brightness control methods have 16 levels, ranging
1157from 0 to 15. 1170from 0 to 15.
1158 1171
1159There are two interfaces to the firmware for direct brightness control, 1172For IBM ThinkPads, there are two interfaces to the firmware for direct
1160EC and UCMS (or CMOS). To select which one should be used, use the 1173brightness control, EC and UCMS (or CMOS). To select which one should be
1161brightness_mode module parameter: brightness_mode=1 selects EC mode, 1174used, use the brightness_mode module parameter: brightness_mode=1 selects
1162brightness_mode=2 selects UCMS mode, brightness_mode=3 selects EC 1175EC mode, brightness_mode=2 selects UCMS mode, brightness_mode=3 selects EC
1163mode with NVRAM backing (so that brightness changes are remembered 1176mode with NVRAM backing (so that brightness changes are remembered across
1164across shutdown/reboot). 1177shutdown/reboot).
1165 1178
1166The driver tries to select which interface to use from a table of 1179The driver tries to select which interface to use from a table of
1167defaults for each ThinkPad model. If it makes a wrong choice, please 1180defaults for each ThinkPad model. If it makes a wrong choice, please
1168report this as a bug, so that we can fix it. 1181report this as a bug, so that we can fix it.
1169 1182
1183Lenovo ThinkPads only support brightness_mode=2 (UCMS).
1184
1170When display backlight brightness controls are available through the 1185When display backlight brightness controls are available through the
1171standard ACPI interface, it is best to use it instead of this direct 1186standard ACPI interface, it is best to use it instead of this direct
1172ThinkPad-specific interface. The driver will disable its native 1187ThinkPad-specific interface. The driver will disable its native
@@ -1254,7 +1269,7 @@ Fan control and monitoring: fan speed, fan enable/disable
1254 1269
1255procfs: /proc/acpi/ibm/fan 1270procfs: /proc/acpi/ibm/fan
1256sysfs device attributes: (hwmon "thinkpad") fan1_input, pwm1, 1271sysfs device attributes: (hwmon "thinkpad") fan1_input, pwm1,
1257 pwm1_enable 1272 pwm1_enable, fan2_input
1258sysfs hwmon driver attributes: fan_watchdog 1273sysfs hwmon driver attributes: fan_watchdog
1259 1274
1260NOTE NOTE NOTE: fan control operations are disabled by default for 1275NOTE 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
1267to work on later R, T, X and Z series ThinkPads but may show a bogus 1282to work on later R, T, X and Z series ThinkPads but may show a bogus
1268value on other models. 1283value on other models.
1269 1284
1285Some Lenovo ThinkPads support a secondary fan. This fan cannot be
1286controlled separately, it shares the main fan control.
1287
1270Fan levels: 1288Fan levels:
1271 1289
1272Most ThinkPad fans work in "levels" at the firmware interface. Level 0 1290Most ThinkPad fans work in "levels" at the firmware interface. Level 0
@@ -1397,6 +1415,11 @@ hwmon device attribute fan1_input:
1397 which can take up to two minutes. May return rubbish on older 1415 which can take up to two minutes. May return rubbish on older
1398 ThinkPads. 1416 ThinkPads.
1399 1417
1418hwmon device attribute fan2_input:
1419 Fan tachometer reading, in RPM, for the secondary fan.
1420 Available only on some ThinkPads. If the secondary fan is
1421 not installed, will always read 0.
1422
1400hwmon driver attribute fan_watchdog: 1423hwmon driver attribute fan_watchdog:
1401 Fan safety watchdog timer interval, in seconds. Minimum is 1424 Fan safety watchdog timer interval, in seconds. Minimum is
1402 1 second, maximum is 120 seconds. 0 disables the watchdog. 1425 1 second, maximum is 120 seconds. 0 disables the watchdog.
@@ -1555,3 +1578,7 @@ Sysfs interface changelog:
15550x020300: hotkey enable/disable support removed, attributes 15780x020300: hotkey enable/disable support removed, attributes
1556 hotkey_bios_enabled and hotkey_enable deprecated and 1579 hotkey_bios_enabled and hotkey_enable deprecated and
1557 marked for removal. 1580 marked for removal.
1581
15820x020400: Marker for 16 LEDs support. Also, LEDs that are known
1583 to not exist in a given model are not registered with
1584 the LED sysfs class anymore.