Ubuntu
linux package

  1. Bug #810093
  2. Comment #45

Comment 45 for bug 810093

Revision history for this message
Tauno Tammemäe (tauno-t) wrote :

I have Samsung NP-R530 laptop computer, did a clean install of Ubuntu "Oneiric Ocelot" a.k.a Ubuntu 11.10 and had the same issue until I added " acpi_backlight=vendor" to the kernel parameters. After doing that i ran the command "sudo update-grub" and rebooted my machine. Everything seems to be working normally now, no flickering and i can change backlight brightness with "FN + arrow keys (function keys to change backlight brightness) while running my computer on battery.
1) Type "sudo nano /etc/default/grub" (replace nano with your favourite text editor, if needed, e.g gedit)
2) Add "acpi_backlight=vendor" to the GRUB_CMDLINE_LINUX_DEFAULT parameters, so that...
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
...or something similar becomes...
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
3) Close nano (CTRL+X) and save changes (Y) or save changes and close if using another kind of editor.
4) Type "sudo update-grub" to terminal
5) Type "sudo reboot" , after that your problem should be gone.
Glad to share my experience and possibly help some other Ubuntu users.