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The screen of my laptop (Dell Vostro 3460) supports 16 levels of brightness: Not only according to the manufacturer, but also as is clear from two OSs: Both Windows 7 and Ubuntu (dual-booted) support all levels. On Windows 7, the hotkeys for brightness adjustment support all levels.

In ubuntu it is apparent when going on the brightness slidebar (see picture below) from left to right; I can count 16 different levels of brightness when doing so.

The brightness slider of ubuntu

When using the hotkeys (Fn+F4 and Fn+F4), however, only 5 levels are supported. How can I adjust these levels and make them in line with what my screen supports?

Anwar
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Koen
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2 Answers2

2

While the question is a little different to your question, I found a possible cure when answering this question Cannot change brightness

After I had completed this, I found that I had the full numbers of steps that I was looking for, rather than the 4 I was being given before.

Basically:

  1. Open Terminal with Ctrl + Alt + T
  2. I typed in sudo gedit /etc/default/grub, entered my password

  3. I changed the line which read

    • GRUB_CMDLINE_LINUX="" to
    • GRUB_CMDLINE_LINUX="acpi_backlight=vendor" (Note: not the vendors name)
  4. Saved and Closed gedit.
  5. in Terminal I updated the Grub with sudo update-grub
  6. I re-booted the laptop
Community
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Simon
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0

Same solution as one-liner

For this solution no nano knowledge is required. It is also handy for multi-machine installation scripts.

sudo sed -i 's|^GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"|GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"|' /etc/default/grub && sudo update-grub
Serge Stroobandt
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