Samsung r580 with Manjaro: backlight doesn't changes

I have a Samsung laptop r580 with radeon hd 5 series. I installed Manjaro but I can't change the backlight. I installed ati-catalyst drivers. I tried set grub parameters to acpi_backlight=vendor (it works on Ubuntu) but it doesn't help. I also retried video, native, none and add acpi_osi=Linux but it doesn't change all same.
How can I enable the backlight control?
P. S. Fn keys work the backlight indicator shows on the screen but the screen backlight always on maximum and doesn't change.

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Category: manjaro Time: 2016-07-28 Views: 0

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