http://bugzilla.kernel.org/show_bug.cgi?id=12302





------- Comment #8 from rui.zh...@intel.com  2008-12-29 18:01 -------
then what's the symptom of the old working kernel without ACPI video driver
loaded?

please attach the output of "grep . /sys/class/backlight/*/*" in:
1. the old working kernel without viode driver loaded, e.g. 2.6.27.10
2. 2.6.28 with boot option "acpi_backlight=vendor"


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