| commit | ea17b198e2cf068efb1eb9165b18edc28aa51bae | |
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | |
| Wed, 3 Oct 2007 04:43:52 +0000 (3 01:43 -0300) | ||
| committer | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | |
| Wed, 3 Oct 2007 01:49:54 +0000 (2 22:49 -0300) | ||
| tree | 2d2b89bf55a1a89a6f9da1617f7899f6ad4b9cb5 | treesnapshot (tar.gz zip) |
| parent | ef7f595282849733873349edc54f750760cf2ce0 | commitdiff |
ACPI: thinkpad-acpi: support 16 levels of brightness
Lenovo ThinkPads with ACPI Video brightness control (_BQC, _BCL, _BCM)
often have 16 brightness levels in EC, and not just eight like older
ThinkPads.
We detect the number of brightness levels by evaluating BCLL on Lenovo
ThinkPads. It returns a list of valid ThinkPad brightness levels. If
BCLL is not there, we can assume eight levels. If it is there and
returns 16 levels, we switch to 16-level mode.
The driver doesn't handle anything other than 16 levels or 8 levels.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Lenovo ThinkPads with ACPI Video brightness control (_BQC, _BCL, _BCM)
often have 16 brightness levels in EC, and not just eight like older
ThinkPads.
We detect the number of brightness levels by evaluating BCLL on Lenovo
ThinkPads. It returns a list of valid ThinkPad brightness levels. If
BCLL is not there, we can assume eight levels. If it is there and
returns 16 levels, we switch to 16-level mode.
The driver doesn't handle anything other than 16 levels or 8 levels.
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
| Documentation/thinkpad-acpi.txt | diffblobblamehistory | |
| drivers/misc/thinkpad_acpi.c | diffblobblamehistory | |
| drivers/misc/thinkpad_acpi.h | diffblobblamehistory |