Can't adjust brightness on a HP Pavillion Dv3

Question

I can not adjust the screen brightness on my HP Pavillion Dv3-2154ca, using Ubuntu 11.10. My Fn-f7/f8 keys don't work (they just show a changing screen brightness bar, with no effect), and adjusting 'screen brightness' does nothing as well.

I'm new to Ubuntu/Linux, so simple answers would be much appreciated!

score 3 · Answer 1 · edited Jan 05 '18 at 20:48

I think that your problem is similar to this one. Because you use Ubuntu 11.10, you don't have to change the kernel, because kernel 3.0 is already patched with the fix. But, according to what is reported in the specified PPA, you may still need a fix to the boot options:

sudo -H gedit /etc/default/grub

Change the line GRUB_CMDLINE_LINUX="" into

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

Run:

sudo update-grub

Restart Ubuntu

score 1 · Answer 2 · edited Jan 05 '18 at 20:49

1

Please try this:

sudo -H gedit /etc/rc.local
Before the exit 0 statement, write
```
echo your_brightness > /sys/class/backlight/acpi_video0/brightness
```
where your_brightness means a number (1 - 10).
Example echo 5 > /sys/class/backlight/acpi_video0/brightness
Reboot

edited Jan 05 '18 at 20:49

Zanna

72,312

answered Feb 09 '12 at 11:14

Ipul

11

score 0 · Answer 3 · edited Feb 09 '12 at 08:02

0

Don't forget: You will need to run sudo update-grub if you want the changes in /etc/default/grub to be there when you reboot!

edited Feb 09 '12 at 08:02

Sathyajith Bhat

1,504

answered Jan 22 '12 at 19:47

dave sisley

1

Can't adjust brightness on a HP Pavillion Dv3

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