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Pull thinkpad-2.6.24 into release branch

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Len Brown 2007-11-20 01:20:42 -05:00
commit d12dbbfe94
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Documentation/thinkpad-acpi.txt
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@ -1,7 +1,7 @@
ThinkPad ACPI Extras Driver
Version 0.16
August 2nd, 2007
Version 0.17
October 04th, 2007
Borislav Deianov <[email protected]>
Henrique de Moraes Holschuh <[email protected]>
@ -923,19 +923,34 @@ sysfs backlight device "thinkpad_screen"
This feature allows software control of the LCD brightness on ThinkPad
models which don't have a hardware brightness slider.
It has some limitations: the LCD backlight cannot be actually turned on or off
by this interface, and in many ThinkPad models, the "dim while on battery"
functionality will be enabled by the BIOS when this interface is used, and
cannot be controlled.
It has some limitations: the LCD backlight cannot be actually turned on or
off by this interface, and in many ThinkPad models, the "dim while on
battery" functionality will be enabled by the BIOS when this interface is
used, and cannot be controlled.
The backlight control has eight levels, ranging from 0 to 7. Some of the
levels may not be distinct.
On IBM (and some of the earlier Lenovo) ThinkPads, the backlight control
has eight brightness levels, ranging from 0 to 7. Some of the levels
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 brightness control, EC and CMOS.
To select which one should be used, use the brightness_mode module parameter:
brightness_mode=1 selects EC mode, brightness_mode=2 selects CMOS mode,
brightness_mode=3 selects both EC and CMOS. The driver tries to autodetect
which interface to use.
There are two interfaces to the firmware for direct brightness control,
EC and CMOS. To select which one should be used, use the
brightness_mode module parameter: brightness_mode=1 selects EC mode,
brightness_mode=2 selects CMOS mode, brightness_mode=3 selects both EC
and CMOS. The driver tries to autodetect which interface to use.
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
backlight brightness control interface if it detects that the standard
ACPI interface is available in the ThinkPad.
The brightness_enable module parameter can be used to control whether
the LCD brightness control feature will be enabled when available.
brightness_enable=0 forces it to be disabled. brightness_enable=1
forces it to be enabled when available, even if the standard ACPI
interface is also available.
Procfs notes:
@ -947,11 +962,11 @@ Procfs notes:
Sysfs notes:
The interface is implemented through the backlight sysfs class, which is poorly
documented at this time.
The interface is implemented through the backlight sysfs class, which is
poorly documented at this time.
Locate the thinkpad_screen device under /sys/class/backlight, and inside it
there will be the following attributes:
Locate the thinkpad_screen device under /sys/class/backlight, and inside
it there will be the following attributes:
max_brightness:
Reads the maximum brightness the hardware can be set to.
@ -961,17 +976,19 @@ there will be the following attributes:
Reads what brightness the screen is set to at this instant.
brightness:
Writes request the driver to change brightness to the given
value. Reads will tell you what brightness the driver is trying
to set the display to when "power" is set to zero and the display
has not been dimmed by a kernel power management event.
Writes request the driver to change brightness to the
given value. Reads will tell you what brightness the
driver is trying to set the display to when "power" is set
to zero and the display has not been dimmed by a kernel
power management event.
power:
power management mode, where 0 is "display on", and 1 to 3 will
dim the display backlight to brightness level 0 because
thinkpad-acpi cannot really turn the backlight off. Kernel
power management events can temporarily increase the current
power management level, i.e. they can dim the display.
power management mode, where 0 is "display on", and 1 to 3
will dim the display backlight to brightness level 0
because thinkpad-acpi cannot really turn the backlight
off. Kernel power management events can temporarily
increase the current power management level, i.e. they can
dim the display.
Volume control -- /proc/acpi/ibm/volume