Ubuntu – Laptop Brightness Problem on Toshiba Portege R705-P35


Basic Specs:

  • Toshiba Portege R705-P35
    • 13.1" screen
    • Intel HD Graphics
    • 4 GB RAM, Core i3 2.4 GHz
  • Dual Boot Ubuntu 11.04 and Windows 7 (using grub bootloader)

Basically, Ubuntu recognizes me pressing the key combinations(Fn+F6 and Fn+F7) for changing my screen brightness and shows the notification bubble where the level changes. However this change isn't actually reflected on the screen. The brightness remains unchanged from what I left it at when I was logged into Windows. This problem has only manifested itself after I update to Natty, the brightness adjustment worked perfectly in 10.10 for me.

It seems I have the same issue as in this: Changing brightness on a Sony Vaio laptop question, however on a Toshiba Portege R705-P35. Even if I knew exactly what to do based on the top answer (yeah, no clue what to do inside the keymap rules), it doesn't seem to be the right thing to do since Ubuntu does recognize my keystrokes anyway.

Relevant, but doesn't solve the issue only presents a workaround:

Can't adjust brightness on my laptop

Best Answer

  • Apparently recent kernels are missing some support for toshiba acpi. There are various patches you can experiment with, discussed here: http://ubuntuforums.org/showthread.php?t=1550219

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