Error: Cannot find backlight controller for radeon acpi graphics card

Question

I get the following message every time I reboot Ubuntu 14.04 LTS:

drm: radeon_acpi_init Error: Cannot find a backlight controller

What does this mean, and how can I fix it?

Many thanks for your attention!

score -1 · Answer 1 · edited Apr 13 '17 at 12:25

-1

With bootscreen check here so you should change the "quiet splash" to "nomodeset" using load screen;

or if you do not have several boot options: after loading press Alt+CTRL+F1 -> login as user or admin -> follow Coldfish answer here

this should help

PS : as the result i can now login successfully, but i see some strange popup that says that something ith monitor connection(on my laptop)

edited Apr 13 '17 at 12:25

Community

answered Aug 31 '14 at 08:16

Illia

1

Welcome to Ask Ubuntu! Whilst this may theoretically answer the question, it would be preferable to include the essential parts of the answer here, and provide the link for reference. – Tim Aug 31 '14 at 16:37

1 Answers1