Question

7

Cannot adjust brightness after sleep

rated 0 times [ 7] [ 0] / answers: 1 / hits: 7853 / 2 Years ago, wed, february 2, 2022, 1:53:37

I have a Toshiba Satellite R830 laptop with Ubuntu 12.04.1 64 bit. The Fn + F6 and Fn + F7 buttons adjust brightness until I put my laptop on sleep.

On wakeup they don't work any longer. Is there a solution or a workaround to this issue?

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whoppinolo

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2 Years ago

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answered 2 Years ago admin · Accepted Answer

I found a better solution than the one selected above.

Press Alt + F2 and type gksudo gedit /etc/default/grub.

Find the line than starts with GRUB_CMDLINE_LINUX_DEFAULT= and modify it as follows: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor".

In a terminal (ctrl + alt + T) type sudo update-grub.

Reboot.

Problem solved.

More info here: https://wiki.ubuntu.com/Kernel/Debugging/Backlight

Edit

This solution no longer works on 13.10 and 14.04.

A solution that does is creating an xorg configuration file:

In a terminal type sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf to create the file.

Followed by sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf to edit its content.

Then add the following content and save:

Section "Device"

        Identifier  "card0"

        Driver      "intel"

        Option      "Backlight"  "intel_backlight"

        BusID       "PCI:0:2:0"



EndSection

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Source: Fix Brightness Control Not Working for Ubuntu 13.10 & 14.04