This commit fixes backlight support for several platforms. Except on recent machines supporting the IGD OpRegion specification, backlight control is rather platform specific. In some cases, we can program the native backlight control regsiters directly without any trouble. On others, we need to use the legacy backlight control register. On still others, we need a combination of the two. And on some platforms, none of the above will work, so we go through the kernel backlight interface, which provides a platform specific driver for backlight control. |
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