diff options
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | 2007-04-24 11:48:19 -0300 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-04-25 02:00:27 -0400 |
| commit | b616004c70dd7f60a1477c3e9d6fddd00ee1fa37 (patch) | |
| tree | 5121e2aedfcedeee676146ed9ea559a0127806c0 /Documentation/thinkpad-acpi.txt | |
| parent | eaa7571b2d1a08873e4bdd8e6db3431df61cd9ad (diff) | |
| download | lwn-b616004c70dd7f60a1477c3e9d6fddd00ee1fa37.tar.gz lwn-b616004c70dd7f60a1477c3e9d6fddd00ee1fa37.zip | |
ACPI: thinkpad-acpi: add sysfs support to the cmos command subdriver
Add sysfs attributes to send ThinkPad CMOS commands.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation/thinkpad-acpi.txt')
| -rw-r--r-- | Documentation/thinkpad-acpi.txt | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt index 339ce21e59df..352e8aee63fe 100644 --- a/Documentation/thinkpad-acpi.txt +++ b/Documentation/thinkpad-acpi.txt @@ -378,23 +378,19 @@ supported. Use "eject2" instead of "eject" for the second bay. Note: the UltraBay eject support on the 600e/x, A22p and A3x is EXPERIMENTAL and may not work as expected. USE WITH CAUTION! -CMOS control -- /proc/acpi/ibm/cmos ------------------------------------ +CMOS control +------------ + +procfs: /proc/acpi/ibm/cmos +sysfs device attribute: cmos_command This feature is used internally by the ACPI firmware to control the ThinkLight on most newer ThinkPad models. It may also control LCD brightness, sounds volume and more, but only on some models. -The commands are non-negative integer numbers: - - echo 0 >/proc/acpi/ibm/cmos - echo 1 >/proc/acpi/ibm/cmos - echo 2 >/proc/acpi/ibm/cmos - ... - -The range of valid numbers is 0 to 21, but not all have an effect and -the behavior varies from model to model. Here is the behavior on the -X40 (tpb is the ThinkPad Buttons utility): +The range of valid cmos command numbers is 0 to 21, but not all have an +effect and the behavior varies from model to model. Here is the behavior +on the X40 (tpb is the ThinkPad Buttons utility): 0 - no effect but tpb reports "Volume down" 1 - no effect but tpb reports "Volume up" @@ -407,6 +403,9 @@ X40 (tpb is the ThinkPad Buttons utility): 13 - ThinkLight off 14 - no effect but tpb reports ThinkLight status change +The cmos command interface is prone to firmware split-brain problems, as +in newer ThinkPads it is just a compatibility layer. + LED control -- /proc/acpi/ibm/led --------------------------------- |