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Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/thinkpad-acpi.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/thinkpad-acpi.txt b/Documentation/thinkpad-acpi.txt index c670363cf5a4..c145bcce2339 100644 --- a/Documentation/thinkpad-acpi.txt +++ b/Documentation/thinkpad-acpi.txt | |||
| @@ -860,6 +860,12 @@ cannot be controlled. | |||
| 860 | The backlight control has eight levels, ranging from 0 to 7. Some of the | 860 | The backlight control has eight levels, ranging from 0 to 7. Some of the |
| 861 | levels may not be distinct. | 861 | levels may not be distinct. |
| 862 | 862 | ||
| 863 | There are two interfaces to the firmware for brightness control, EC and CMOS. | ||
| 864 | To select which one should be used, use the brightness_mode module parameter: | ||
| 865 | brightness_mode=1 selects EC mode, brightness_mode=2 selects CMOS mode, | ||
| 866 | brightness_mode=3 selects both EC and CMOS. The driver tries to autodetect | ||
| 867 | which interface to use. | ||
| 868 | |||
| 863 | Procfs notes: | 869 | Procfs notes: |
| 864 | 870 | ||
| 865 | The available commands are: | 871 | The available commands are: |