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Brightness Issue with Dell 1558 on ubuntu 16.06

Asked by Singh

Hi All,

Recently I have installed ubuntu 16.04 LTS on my laptop dell 1558. After installing Ubuntu i came to know its brightness is quite high even in low. I tried with functions keys but its not working. it's really painful for eyes to see laptop screen. Please let me any solution so that i can at least low my laptop brightness.

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actionparsnip (andrew-woodhead666) said : 		#1

http://askubuntu.com/questions/363087/13-10-cant-adjust-dell-laptop-backlight

Try that

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Singh (sameerp011) said : 		#2

Hi Andrew,

I clicked on your given link and i got two solutions please take a look. I don't understand how to used this first i have change etc/default/grub and update the grub and then Add /usr/share/X11/xorg.conf.d/20-intel.conf. how?

Change /etc/default/grub

I used "sudo vim /etc/default/grub" but use whatever editor you're comfortable with but you will need to use sudo to edit it as the root user.

From:

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
To:

GRUB_CMDLINE_LINUX=""
Then run:

sudo update-grub

Add /usr/share/X11/xorg.conf.d/20-intel.conf

I used "sudo vim /usr/share/X11/xorg.conf.d/20-intel.conf" and then ran :set paste and hit i for insert and pasted in the contents.

Section "Device"
    Identifier "card0"
    Driver "intel"
    Option "Backlight" "intel_backlight"
    BusID "PCI:0:2:0"
EndSection
Then reboot and login again and your function key with the brightness up/down should work again.

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actionparsnip (andrew-woodhead666) said : 		#3

If you run:

sudo gedit /etc/default/grub; sudo update-grub

You can then update the file as stated. You can do the same with /usr/share/X11/xorg.conf.d/20-intel.conf

The file doesn't exist by default but if you make it then it will be used.

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Singh (sameerp011) said : 		#4

Hi Andrew,

First solution is not working at all on my laptop Dell 1558, I used another one but Command echo 4000 | sudo tee /sys/class/backlight/intel_backlight/brightness not working please let me know how to use this command while used this command i am getting error message : tee: /sys/class/backlight/intel_backlight/brightness: No such file or directory
4000

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Launchpad Janitor (janitor) said : 		#5

This question was expired because it remained in the 'Open' state without activity for the last 15 days.