http://bugzilla.kernel.org/show_bug.cgi?id=12249





--- Comment #94 from Zhang Rui <rui.zh...@intel.com>  2009-04-02 02:14:55 ---
this seems to be another BIOS/AML code problem.
when set the backlight to 10 (the minimum brightness value),
there is a failure when evaluating STBR method.
please do this test in the comment #91 kernel,
1. echo 0xffffffff > /sys/module/acpi/parameters/trace_debug_layer
2. echo 0xffffffff > /sys/module/acpi/parameters/trace_debug_level
3. echo STBR > /sys/module/acpi/parameters/trace_method_name
4. echo 1 > /sys/module/acpi/parameters/trace_state
5. echo 0 >/sys/class/backlight/acpi_video0/brightness
5. echo 10 >/sys/class/backlight/acpi_video0/brightness
6. attach the dmesg output

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