diff options
Diffstat (limited to 'Documentation/thinkpad-acpi.txt')
| -rw-r--r-- | Documentation/thinkpad-acpi.txt | 41 |
1 files changed, 17 insertions, 24 deletions
diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt index b90d9a7e81b..2f30db0e0db 100644 --- a/Documentation/thinkpad-acpi.txt +++ b/Documentation/thinkpad-acpi.txt @@ -153,29 +153,22 @@ addition, the lid microswitch and some docking station buttons may also generate such events. The bit mask allows some control over which hot keys generate ACPI -events. Not all bits in the mask can be modified. Not all bits that -can be modified do anything. Not all hot keys can be individually -controlled by the mask. Most recent ThinkPad models honor the -following bits (assuming the hot keys feature has been enabled): - - key bit behavior when set behavior when unset - - Fn-F3 always generates ACPI event - Fn-F4 always generates ACPI event - Fn-F5 0010 generate ACPI event enable/disable Bluetooth - Fn-F7 0040 generate ACPI event switch LCD and external display - Fn-F8 0080 generate ACPI event expand screen or none - Fn-F9 0100 generate ACPI event none - Fn-F12 always generates ACPI event - -Some models do not support all of the above. For example, the T30 does -not support Fn-F5 and Fn-F9. Other models do not support the mask at -all. On those models, hot keys cannot be controlled individually. +events. Not all bits in the mask can be modified. Not all bits that can +be modified do anything. Not all hot keys can be individually controlled +by the mask. Some models do not support the mask at all. On those +models, hot keys cannot be controlled individually. Note that enabling ACPI events for some keys prevents their default -behavior. For example, if events for Fn-F5 are enabled, that key will -no longer enable/disable Bluetooth by itself. This can still be done -from an acpid handler for the ibm/hotkey event. +behavior. For example, if events for Fn-F5 are enabled, that key will no +longer enable/disable Bluetooth by itself. This can still be done from +an acpid handler for the ibm/hotkey event. + +On some models, even enabling/disabling the entire hot key feature may +change the way some keys behave (e.g. in a T43, Fn+F4 will generate an +button/sleep ACPI event if hot keys are disabled, and it will ignore its +mask when hot keys are enabled, so the key always does something. On a +X40, Fn+F4 respects its mask status, but generates the button/sleep ACPI +event if masked off). Note also that not all Fn key combinations are supported through ACPI. For example, on the X40, the brightness, volume and "Access IBM" @@ -189,9 +182,9 @@ The following commands can be written to the /proc/acpi/ibm/hotkey file: echo enable > /proc/acpi/ibm/hotkey -- enable the hot keys feature echo disable > /proc/acpi/ibm/hotkey -- disable the hot keys feature - echo 0xffff > /proc/acpi/ibm/hotkey -- enable all possible hot keys - echo 0x0000 > /proc/acpi/ibm/hotkey -- disable all possible hot keys - ... any other 4-hex-digit mask ... + echo 0xffffffff > /proc/acpi/ibm/hotkey -- enable all hot keys + echo 0 > /proc/acpi/ibm/hotkey -- disable all possible hot keys + ... any other 8-hex-digit mask ... echo reset > /proc/acpi/ibm/hotkey -- restore the original mask sysfs notes: |