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I have a hp pavilion dv6 with xubuntu installed. however there isn't a way to change the screen brightness, i tried the fn plus scroll keys to no avail, any ideas?

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Same here. cannot change brightness with Fn + arrow keys. –  Stann Oct 29 '11 at 17:46
    
Have you solved this issue? –  pl1nk Jun 27 '12 at 22:26
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8 Answers

Package name is xfce4-power-manager-plugins. Solved my brightness problem in xubuntu 10.04.2.

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I'd give you a thousand +1s! –  akled Feb 1 '13 at 21:32
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echo 1 | sudo tee /sys/class/backlight/acpi_video0/brightness

You can change:

  • Brightness from 1 to 10.
  • acpi_video0 or acpi_video1
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I'm extrremely new to xubuntu, and I was wondering if it could be possible to assign this command to a shortcut key? –  Jiskya Nov 2 '12 at 20:41
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XFCE has a panel applet for changing brightness, I don't remember if it's installed, so search in packages (e.g. in synaptic) for XFCE and brightness. Then right-click on the panel to add it.

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After installing additional power manager package I could add a brightness applet to the panel –  Nicky De Maeyer Feb 7 '12 at 10:39
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You can use xgamma. The default value is 1.0, higher is brighter, lower is darker.

Example xgamma -gamma 0.9.

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not looking to change the gamma, i want to change the backlight brightness –  Adam Wilkins Oct 27 '11 at 18:27
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You need to download the following files in /etc/acpi/ directory

Download video_brightnessup.sh from here

Download video_brightnessdown.sh from here

After replacing these scripts

No reboot or logout required, simply press your function combination on your laptop to change brightness. Try to press FN + Up/Down Arrow.

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did absolutely nothing :/ –  Adam Wilkins Oct 27 '11 at 18:22
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I had this problem, i unchecked "Power Manager" from "Application Autostart" list in Settings -> Session and Startup and added another application with this command xfce4-power-manager --no-daemon then i have not have this problem yet.

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I've had this problem as well.

What fixed it for me was adding acpi_backlight=vendor to the kernel boot line. For more information see Brightness not working on an HP Pavilion Dv6 with a ATI Radeon HD6770M.

After doing this, I could change my brightness normally using the F2 and F3 keys.

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What worked for me was modifying the /etc/default/grub file.

Change the line

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

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

Then in a terminal sudo update-grub and reboot.

More info here.

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