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    Subject[PATCH 0/3] Fix backlight issues on some Windows 8 systems
    Date
    Windows 8 introduced new policy for backlight control by pushing it out to
    graphics drivers. This appears to have coincided with a range of vendors
    adding Windows 8 checks to their backlight control code which trigger either
    awkward behaviour (Lenovo) or complete brokenness (some Dells). The simplest
    thing to do would be to just disable ACPI backlight control entirely if the
    firmware indicates Windows 8 support, but it's entirely possible that
    individual graphics drivers might still make use of the ACPI functionality in
    preference to native control.

    The first two patches in this series are picked from other patchesets aimed at
    solving similar problems. The last simply unregisters ACPI backlight control
    on Windows 8 systems when using an Intel GPU. Similar code could be added to
    other drivers, but I'm reluctant to do so without further investigation as
    to the behaviour of the vendor drivers under Windows.

    --
    Matthew Garrett | mjg59@srcf.ucam.org



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