https://bugzilla.kernel.org/show_bug.cgi?id=85051

Aaron Lu <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |[email protected]
           Assignee|acpi_power-video@kernel-bug |[email protected]
                   |s.osdl.org                  |

--- Comment #1 from Aaron Lu <[email protected]> ---
Please do:
$ ls /sys/class/backlight
on both kernels.

Also, please test if manually change the brightness file works(as root):
# cd /sys/class/backlight/XXX
# cat max_brightness
xxx
# echo 500 > brightness
# echo 600 > brightness
...

Please attach acpidump:
# acpidump > acpidump.txt

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