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#1 2013-11-05 13:51:50

From: Dresden, Germany
Registered: 2013-11-05
Posts: 10

HOWTO Acer(TM5742) Screen Brightness Keys

Hello everyone!

I just installed #! on my Acer TravelMate5742 and had some problems with the screen brightness adjustment keys.
After some search i found a fix which might work for multiple Acer laptops and i wanted to share with you. smile

First you have to open the file /etc/default/grub with a texteditor of your choice and sudo rights.

sudo nano /etc/default/grub

In the file you change the value of GRUB_CMDLINE_LINUX like this:

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

now write the file via ctrl+o and exit nano via ctrl+x.
You only have to update grub with sudo rights

sudo update-grub

and reboot. After that and your screen brightness keys should work fine.

If you have any suggestions or further questions, don't hesitate to post below or write me a pm.


Last edited by Jensit (2013-11-05 15:06:14)

AcerTM5742: i3-370m, 4GB DDR3, 320GB HDD
Desktop: i7-3770k, NVIDIA GeForce GTX 680, 24GB DDR3, 240GB SSD, 2TB HDD
Acer Screen Brighness Keys Fix


Be excellent to each other!

#2 2013-11-07 05:56:51

Internal Affairs
From: North Carolina
Registered: 2009-10-18
Posts: 13,970

Re: HOWTO Acer(TM5742) Screen Brightness Keys

/moved to Tips, Tricks & Scripts smile


#3 2014-11-25 12:04:18

Registered: 2014-11-21
Posts: 30

Re: HOWTO Acer(TM5742) Screen Brightness Keys

Thanks. big_smile Works with Samsung N150P too. Now I just have to work out why power manager isn't saving my settings.


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