On mar., 2013-09-17 at 17:23 +0800, Aaron Lu wrote: > According to Matthew Garrett, "Windows 8 leaves backlight control up > to individual graphics drivers rather than making ACPI calls itself. > There's plenty of evidence to suggest that the Intel driver for > Windows 8 doesn't use the ACPI interface, including the fact that > it's broken on a bunch of machines when the OS claims to support > Windows 8. The simplest thing to do appears to be to disable the > ACPI backlight interface on these systems". > > So for Win8 systems, if there is native backlight control interface > registered by GPU driver, ACPI video will not register its own. For > users who prefer to keep ACPI video's backlight interface, the > existing > kernel cmdline option acpi_backlight=video can be used. > > This patch is an evolution from previous work done by Matthew Garrett, > Chun-Yi Lee, Seth Forshee and Rafael J. Wysocki. > > Signed-off-by: Aaron Lu <aaron...@intel.com> Tested-by: Yves-Alexis Perez <cor...@debian.org> -- Yves-Alexis
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