0

My Samsung laptop (series 7 Chronos, Radeon graphics, Core i5) came originally with Windows 8. When upgraded to Windows 10 the display brightness became stuck at maximum. The function keys also became unresponsive. But that is a different story.

After a lot of complaining and dely, Samsung provided a stand alone software that adjusted the brightness. It was not integrated into Windows 10. I got tired of the whole things and ditched Windows 10 and started using Ubuntu. Now I am still stuck with this dazzling bright screen which does not respond to brightness controls provided by Ubuntu.

I noticed that many people have had the same problem with other types of computers. I have tried some of them, but so far to no avail. Being new to Ubuntu I don't want to try anything too drastic in case I mess up my Ubuntu set up which is working very well at the moment.

I would be grateful for any suggestions that can fix the problem (and save my eyesight!)

Many thaks in advance

-1

I found a bug report on launch pad describing the same problem and some solutions: Samsung 7 screen brightness

Basically ACPI is implemented improperly on your motherboard with Intel CPU and Radeon graphics. The solution is to add the parameters acpi_osi=linux and acpi_backlight=video to your kernel command lines in Grub. You can google how to modify grub kernel parameters and ask any questions you have on updating grub.

  • A solution offered at: lordamit.github.io/Brightness has partially worked for me. I say partially because the python app, when executed, disables the terminal window and I have to open a new one. But it is better than nothing. I will try the suggestion by WinEunuuchs2Unix as soon as I know how to modify grub kernel parameters. – elmclose Aug 31 '16 at 6:50
  • It's described in AskUbuntu: how-do-i-add-a-kernel-boot-parameter – WinEunuuchs2Unix Aug 31 '16 at 10:13
  • Success! I added the parameters to the kernel command line in Grub as suggested above and rebooted. Brightness control was back. Thank you WinEunuuchs2Unix, you saved my laptop (and eyesight!) – elmclose Aug 31 '16 at 13:18
  • I understand the eyesight point. I had same experience in 2014 when I started Ubuntu with my old Toshiba laptop. Could you upvote answer back to zero and mark as solved please. Thanks – WinEunuuchs2Unix Aug 31 '16 at 14:57

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.