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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

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! – jcora Feb 1 '13 at 21:32
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
@Jiskya – Vlad is Glad Apr 27 at 6:47

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

You need to download the following files in /etc/acpi/ directory

Download from here

Download 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

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 acpi_osi=Linux acpi_backlight=vendor"

Then in a terminal sudo update-grub and reboot.

More info here.

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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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