A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

ACPI: thinkpad-acpi: allow use of CMOS NVRAM for brightness control

Browse source 
It appears that Lenovo decided to break the EC brightness control interface
in a weird way in their latest BIOSes.  Fortunately, the old CMOS NVRAM
interface works just fine in such BIOSes.

Add a module parameter that allows the user to select which strategy to use
for brightness control: EC, NVRAM, or both.  By default, do both (which is
the way thinkpad-acpi used to work until now) on IBM ThinkPads, and use
NVRAM only on Lenovo ThinkPads.

Signed-off-by: Henrique de Moraes Holschuh <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Henrique de Moraes Holschuh 2007-07-18 23:45:43 -03:00 • committed by Len Brown
commit 24d3b77467
4 changed files with 67 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

6
Documentation/thinkpad-acpi.txt
View file

@ -860,6 +860,12 @@ cannot be controlled.
The backlight control has eight levels, ranging from 0 to 7. Some of the
levels may not be distinct.
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.
Procfs notes:
The available commands are: