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I've got an old Dell E1405 which smoothly runs 14.04, with one caveat that is.

When I press the Fn button with arrow-up or arrow-down, the brightness jumps in huge steps.

Is there a way to disable this? So that the brightness is only adjusted by the hardware (I would believe that the BIOS adjusts it because prior to system startup, I can also change brightness)

Any help would be appreciated.

Thank you.

naryfa
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  • It may help to set `acpi` OS and vendor in the bootloader by [editing grub.cfg](http://askubuntu.com/a/19487/178596), as mentioned [here](http://askubuntu.com/questions/28848/what-does-the-kernel-boot-parameter-set-acpi-osi-linux-do): (by adding the lines `acpi_osi=Linux acpi_backlight=vendor`) - this I find works on a few machines to get brightness to be less jumpy. – Wilf May 20 '15 at 16:07
  • Thank you Wilf, you're golden. This has worked perfectly. Hope someone else can use this information too. – naryfa May 20 '15 at 20:50

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It may help to set acpi OS and vendor in the bootloader by editing grub.cfg, as mentioned here, by adding this:

acpi_osi=Linux acpi_backlight=vendor

To the GRUB_CMDLINE_LINUX_DEFAULT line in /etc/default/grub. You then need to run sudo update-grub and reboot to make the changes.

This I find works on a few machines, to get brightness to be less jumpy etc

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Wilf
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