Why doesn't brightness control work on proprietary driver in Linux?

A

Andrey Puzhaenko2014-09-06 19:38:03

linux

Andrey Puzhaenko, 2014-09-06 19:38:03

Hardware:
Notebook ASUS X501U.
Graphics Radeon 7340.
System: Linux Mint 17 Cinnamon 64-bit.
Prior to this, there was Ubuntu 14.04, where the brightness control did not work the same way.
Brightness changed only when working on a free driver. When switching to proprietary, the adjustment stopped working. Switched back to free - the result is zero.
I tried adding the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux" to /etc/default/grub/ and the brightness didn't work. Then the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor". Brightness doesn't work either.
There is no brightness slider in power management at all now. Fn + f5 / f6 does not respond to the brightness buttons.
Can anyone suggest what else to do?

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1 answer(s)

A

Anton, 2014-09-08
@ZombieHamster

I use xbacklight, for example turn the brightness to 100%xbacklight -set 100