Ubuntu – Desktop doesn’t remember brightness settings after a reboot

brightnessgnome

Every time I reboot my machine the brightness goes back to 100% in Gnome. I wish it would keep the last setting. Is there anyway?

Best Answer

This is supposed to be configurable in the energy options, set the brightness to the desired level and it will always be used. If you use a laptop you will also need to configure the level for battery mode as well...

I found that Gnome has some issues about lcd panel brightness, e.g. if I run on battery mode and set the brightness manually to a given level and leave the laptop unattended for 10 seconds it will go back to the preset brightness when I take control back. Same goes when on A/C mode except it takes longer so goes unnoticed more easily. I believe all those settings should be saved somewhere and restored - at least for A/C mode.

EDIT: For gnome3 this does not work (at least for me).

Related Solutions

Ubuntu – Screen brightness reset to minimum after every reboot

In the file /etc/rc.local add before line exit 0:

echo 5 > /sys/class/backlight/acpi_video0/brightness

Where 5 is the brightness level from 0 to 10

Ubuntu – Brightness and actual backlight mismatch after reboot

The solution is updating grub such this:

Open a terminal (Ctrl+Alt+T) and enter:

sudo gedit /etc/default/grub

Then find the line GRUB_CMDLINE_LINUX_DEFAULT="quite splash" and add "acpi_osi=Linux acpi_backlight=vendor" like this:

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

Save and exit the file, and run:

sudo update-grub

Now the brightness level stays equal to the actual backlight level after reboot, and brightness hotkeys remain working. All other hotkeys which were working before grub changed are working now, but the hotkey for enabling/disabling touchpad.

Best Answer

Related Solutions

Ubuntu – Screen brightness reset to minimum after every reboot

Ubuntu – Brightness and actual backlight mismatch after reboot

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