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I have a dual graphics card: intel 4000 and nvidia 630m...

I installed bumblebee and intel drivers from their website. I thought the brightness problem will be solved by installing these drivers.

But, brightness works only for two steps: that is, dim, medium, high... But, it doesn't increase step wise. Can you please help me sort this problem?

I'm a newbie to ubuntu and this is my first trial. So, please give me a detailed guide... Thank you :)

EDIT: My model is HP DV6 7040tx. My Laptop Model

SilleBille
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4 Answers4

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I finally figured out in this thread: How to control Brightness

Just to keep it straight

Run the following command in Terminal:

sudo gedit /etc/default/grub

then change

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

to

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

then save and run:

sudo update-grub

and then restart the system for changes to take effect.

Community
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SilleBille
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Go to system settings --> Brightness & Lock. Here you can manually set your brightness by sliding the bar to the left/right. Hope this helps!

Cedric
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  • that bar as i mentioned, DOESN'T CHANGE. Only 3 step works not more . – SilleBille May 26 '13 at 05:09
  • Ow I thought you used keyboard buttons for changing the brightness and those only allowed the 3 steps. No idea then I'm pretty new to Ubuntu as well. – Cedric May 26 '13 at 10:24
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Ok, I found it.

I changed acpi_osi=Linux to acpi_osi=Linux backlight=vendor, then ran:

sudo update-grub2

A reboot and the sensitivity is fixed.

It seems all Intel/Nvidia dual graphics card are affected by this.

trudide12
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Look for nvidia panel in dash, open it up and make the changes there.

Arup Roy Chowdhury
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