[Bug 571421] Re: brightness hotkeys not functional on Lenovo Ideapad u450p

[Ike Panhc]

Have another test on B550

# watch --interval=1 cat /sys/class/backlight/acpi_video0/brightness

The brightness level is from 0 to 10 and each time I press the
brightness hotkey, it will in/decrease by 2.

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brightness hotkeys not functional on Lenovo Ideapad u450p
https://bugs.launchpad.net/bugs/571421
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