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I have Ubuntu 14.04 on MacBook Pro and I cant alter the brightness from System Settings (no option there). My graphics card details are as follows. 

$ lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Venus XT [Radeon HD 8870M] (rev 83)

I have tried many solutions online but none worked for me. I dont wanna try some scary solutions as I have already damaged system settings once, leading me to OS re-install.

Zia
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1 Answers1

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It looks like this is has happened before with Ubuntu. Try out a software dimmer: https://apps.ubuntu.com/cat/applications/brightness-controller/

Other questions that may help you: https://unix.stackexchange.com/questions/182856/screen-brightness-adjustment-not-working-in-ubuntu-14-04

In /etc/default/grub make sure you have acpi_backlight=vendor in GRUB_CMDLINE_LINUX_DEFAULT.

Here is mine:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Then run update-grub and reboot.

Another question (with a ton of answers) Make xconf configuration permanent

Community
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Daniel
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