https://bugzilla.kernel.org/show_bug.cgi?id=21212





--- Comment #13 from Zhang Rui <rui.zh...@intel.com>  2010-11-04 02:13:57 ---
Created an attachment (id=36072)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=36072)
custom DSDT

If the patch works, we only know that BIOS exports minimum backlight values to
OS.
To find the root cause why BIOS behaves in this way, please:
1. build a 2.6.36 kernel with this custom DSDT.
2. reboot with boot option "acpi.aml_debug_output=1"
3. you should get a dimming screen after system boot now, and save the dmesg
4. attach the dmesg output

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