http://bugzilla.kernel.org/show_bug.cgi?id=11936





--- Comment #12 from Zhang Rui <rui.zh...@intel.com>  2009-06-22 03:02:24 ---
please try the latest git kernel and build with this configuration:
CONFIG_ACPI_VIDEO=m
CONFIG_ACPI_DEBUG=y
CONFIG_DRM=y
CONFIG_DRM_I915=y
CONFIG_DRM_I915_KMS=y
reboot and load the ACPI video driver,
please attach the output of "grep . /sys/class/backlight/*/*"
if it's not empty, can you change the backlight via this I/F?

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