[Bug 75001] [945gm] ACPI Brightness adjustment is broken in 945GM with kernel 3.14-rc2

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Feb 24 07:27:37 PST 2014


https://bugs.freedesktop.org/show_bug.cgi?id=75001

--- Comment #5 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #3)
> Notice the legacy backlight combination bit set - that seems to be being
> used by the ACPI firmware to control the backlight.

My scarce gen3 specs do not say anything about bit 16 of BLC_PWM_CTL. Bits
31:17 are similar to gen2, which does have bit 16 specified as legacy mode.

Clearly we should interpret bit 16 as legacy mode also for I945GM, but how
about other gen3 hardware? *scratches head*

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