Ubuntu

Brightness Fn Keys Not Working on Asus X401A

Asked by Jamie on 2013-10-10

si@si-X401A1:~/Desktop$ lsb_release -rd
Description: Ubuntu 13.04
Release: 13.04

Software Center: 5.6.0

What I expected to happen:

F5 should decrease brightness and F6 should increase brightness.

What happened:

Immediately after install, you can lower the brightness half-a-bar and NO further. It is highly annoying because I am stuck with a super bright screen. I am able to turn the brightness down in the settings but this is a temporary fix.

I have tried changing the /etc/default/grub file with the following:

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

Nothing seems to fix this.

Please can we fix this. I will provide any information needed to help. Let me know what you need and I'll provide it.

Question information

Language:: English Edit question

Status:: Answered

For:: Ubuntu Edit question

Assignee:: No assignee Edit question

Last query:: 2013-10-11

Last reply:: 2013-10-11

Link existing bug

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actionparsnip (andrew-woodhead666) said on 2013-10-11:

Are there any bugs reported?

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Jamie (jamie4594543-deactivatedaccount) said on 2013-10-11:

There was: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1133168

But it hasn't been fixed yet. It's still an issue as of 10/10/2013.

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Jamie (jamie4594543-deactivatedaccount) said on 2013-10-11:

Also, can I just add. I've changed the grub file so it has the following in:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"

This doesn't make the FN keys work, but it lets you turn down the brightness via the GUI. The only problem is, after a short while it just reverts back to full brightness.

At the moment it's rendering the laptop useless. It's impossible to work on full brightness.

Revision history for this message

actionparsnip (andrew-woodhead666) said on 2013-10-11:

http://s-and-j.co.uk/wiki/index.php?title=Asus_X401A_Fn_keys_not_controlling_screen_brightness