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| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | 2010-08-09 23:48:19 -0300 |
|---|---|---|
| committer | Matthew Garrett <mjg@redhat.com> | 2010-08-16 11:54:50 -0400 |
| commit | 217f09631a420295a9688e18aa4dbad1b385e56c (patch) | |
| tree | 4b3f7890f28abad25c1bf3ff2b4b60499c06765d /Documentation/laptops | |
| parent | 122f26726b5e16174bf8a707df14be1d93c49d62 (diff) | |
| download | lwn-217f09631a420295a9688e18aa4dbad1b385e56c.tar.gz lwn-217f09631a420295a9688e18aa4dbad1b385e56c.zip | |
thinkpad-acpi: untangle ACPI/vendor backlight selection
acpi_video_backlight_support() already tells us if ACPI is handling
backlight control through the generic ACPI handle. It is better to just
trust it.
While at it, adjust down a printk priority, and test earlier for
brightness_enable=0.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'Documentation/laptops')
| -rw-r--r-- | Documentation/laptops/thinkpad-acpi.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt index f6f80257addb..1565eefd6fd5 100644 --- a/Documentation/laptops/thinkpad-acpi.txt +++ b/Documentation/laptops/thinkpad-acpi.txt @@ -1024,6 +1024,10 @@ 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. +If you want to use the thinkpad-acpi backlight brightness control +instead of the generic ACPI video backlight brightness control for some +reason, you should use the acpi_backlight=vendor kernel parameter. + 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 |