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I have been running Ubuntu (64-bit) on my HP 6710b laptop (Core 2 Duo with integrated graphics) for several years, and the backlight brightness keys have always worked. Since I upgraded to Ubuntu 12.10 earlier today, those keys do not work any more.

The secondary function keys:

  • Fn+F3: sleep; still works (and considerably faster than ever before!)
  • Fn+F8: battery info; still works
  • Fn+F9: reduce brightness; stopped working in 12.10
  • Fn+F10: increase brightness; stopped working in 12.10

It may also be worth while mentioning that X does not appear to be receiving the brightness events at all, or at least not sending them out further. (This I detected with a key logger I wrote for a Uni project, which uses X's Record extension; it is informed of the sleep and battery info keystrokes, but doesn't receive the brightness ones at all.)

In the mean time, I know that I can use the Brightness & Lock settings screen to alter the brightness. (Wow! I can suddenly make my backlight darker than I could before—I can go right down to turning the backlight off, something I couldn't do before... but this model has a fairly dim screen, so I don't expect to use that much, if ever.)

How can I get the brightness keys working again?

This question is probably strongly related to I can't control my Brightness in HP Compaq 6710s.

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This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. –  Jorge Castro Nov 25 '12 at 16:21
    
Having noticed this question again on account of its passing 1,000 views, I should mention some new information: somewhere along the way, a month or two back, an update reverted it to the old behaviour: higher minimum brightness, but the brightness keys work again. –  Chris Morgan Mar 15 '13 at 12:17
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closed as off topic by Jorge Castro, Ringtail, fossfreedom Nov 25 '12 at 16:50

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1 Answer

I have tried by updating the Kernel to the latest version. But I have found the best solution that can increase or decrease the brightness of the PC in Ubuntu using the function and brightness button. Just follow the steps:

Open terminal (Clt+Alt+T) and run the command given below:

sudo gedit /etc/default/grub

Now the new window opens and you will see the lines given below:

GRUB_CMDLINE_LINUX_DEFAULT="quite_splice"

GRUB_CMDLINE_LINUX_DEFAULT="" 

Now you have to change the lines above by the command lines given below:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"

Then save the window and Update the grub from the terminal using :

sudo update-grub

Now you can Increase or decrease the brightness of your PC in Ubuntu 12.04 and the other versions also. This technique can be used in HP DV6, Acer Aspire, Dell Inspiron, Toshiba and more others.

http://www.refreshit.info/2012/08/solved-brightness-increase-and-decrease.html

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