Adjust Brightness Problems In Acer Laptops (Linux)
Published on August 11 2012

Over the past few years, I have been using different kinds of Linux distros alongside windows 7 as a dual-boot. I've used Ubuntu 10.10, Linux mint but came to settle with Fedora. One thing that was common to all this OS's was that neither the brightness hot keys or brightness application changed my screen's brightness to my preffered one. Its like it was locked to some locked percentage, almost 50% I guess. Until recently is when I found a fix to this problem and decided to share. My laptop model is Acer Aspire 5736Z-4336. Follow this 3 easy steps

Step 1:
Open up your terminal and type :
 sudo gedit /etc/default/grub
Step 2:
Search for a line GRUB_CMDLINE_LINUX=""
Change it to: GRUB_CMDLINE_LINUX="acpi_osi=Linux"

The line might have other parameters like my case, it looks like
GRUB_CMDLINE_LINUX="rd.md=0 rd.dm=0 SYSFONT=True rd.lvm.lv=vg_jose/lv_root KEYTABLE=us rd.lvm.lv=vg_jose/lv_swap rd.luks=0 LANG=en_US.UTF-8 rhgb quiet"

Add acpi_osi=Linux before the last quotation mark so that it now looks like
GRUB_CMDLINE_LINUX="rd.md=0 rd.dm=0 SYSFONT=True rd.lvm.lv=vg_jose/lv_root KEYTABLE=us rd.lvm.lv=vg_jose/lv_swap rd.luks=0 LANG=en_US.UTF-8 rhgb quiet acpi_osi=Linux"
Step 3:
For those using debian base systems like ubuntu, linux mint etc update the grub file like :
 sudo update-grub
For those using redhat based systems like Fedora, Mandriva, Cent OS etc run :
  sudo grub2-mkconfig -o /boot/grub2/grub.cfg

That's it! restart your machine at test whether it works. Hope it works for you like it did for me. :-)


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