I installed Ubuntu 13.04. I notice that when I lower the brightness there is a lowest brightness point and when I lower further than that the brightness will increase. And why every time I restart the computer the brightness value goes to default.

  • And what is the question here? Please ask a question, not simply describe a problem.
    – mondjunge
    Oct 9, 2013 at 12:11

1 Answer 1


Try this command:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

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