[kernel/f21] Make sure acpi brightness_switch is disabled (like forever in Fedora)

[Ranjan Maitra]

> 
> Oops.  The revert-revert patch was never actually dropped so long ago.
> So we're still defaulting the ACPI brightness_switch_enabled parameter
> off by default in Fedora.
> 
> If you still believe we should drop it, I can do so with the 4.2
> kernels.  Hopefully we've had enough time upstream to shake out any
> issues.  I'd like confirmation before I do that though.

Just to be clear, because I am hopelessly confused, what will the dropping do. Have the ACPI brightness_switch_enabled parameter enabled by default? If so, I would like that.

Thanks,
Ranjan

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