[Bug 257827] Re: brightness changes twice when using hotkeys

[Zhang Rui]

module parameter /sys/module/video/parameters/brightness_switch_enabled is designed as a switch to disable/enable the backlight control in ACPI video driver.
does the problem still exist after running "echo 0 > /sys/module/video/parameters/brightness_switch_enabled"?

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brightness changes twice when using hotkeys
https://bugs.launchpad.net/bugs/257827
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