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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2007-10-30 20:46:20 +0100
committerLen Brown <len.brown@intel.com>2007-11-05 19:07:11 +0100
commita3f104c02ab842574e699186cf953551aafe2ca9 (patch)
tree8cee0bbd37ac14b8a9bb9a88e594a65b424e8ff9 /Documentation/dvb
parentACPI: thinkpad-acpi: revert keymap changes (diff)
downloadlinux-a3f104c02ab842574e699186cf953551aafe2ca9.tar.xz
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ACPI: thinkpad-acpi: support 16 levels of brightness (v3)
Lenovo ThinkPads often have 16 brightness levels in EC, and not just eight levels like older ThinkPads. They also have standard ACPI backlight brightness control. We detect the number of brightness levels by the presence of a BCLL package with 16 entries. If BCLL is not there, we assume eight levels (Z6*). If it is there, but it doesn't have 16 entries, we assume eight levels (T60). Otherwise we assume sixteen levels (T61, X61, etc). We don't use _BCL because it can have side-effects in thinkpads. Thanks to Thomas Renninger <trenn@suse.de> for notifying me of this potential problem. Using the standard ACPI backlight brightness control *instead* of the native thinkpad backlight control is a better idea, though. A different patch will take care of this. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Thomas Renninger <trenn@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
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