Adjust the brightness on ACER Aspire 4740 in Ubuntu

My new laptop is Acer Aspire 4740 which configuration is very good. But I am having problem in adjusting the brightness after installing Ubuntu 10.10. This problem is occurred due to Intel HD graphics with the BIOS firmware version 1.05 . Whatever, I had to do a little hack to fix it.

So, first I updated the Bios firmware from  version 1.05 t0 version 1.09. You can download it from I downloaded the .exe file and install in windows.

Then reboot to Ubuntu. And edit /etc/default/grub file. Type this in terminal

sudo gedit /etc/default/grub

Then change this line: GRUB_CMDLINE_LINUX_DEFAULT=””


And also chnage this line: GRUB_CMDLINE_LINUX=””


Then update the grub

sudo update-grub

Done. Still the brightness is not automatically adjusted when power cord has been unplugged, but i can adjust brightness by arrows keys. I didn’t get any better solution than this. Happy Hack 🙂


Eftakhairul Islam

Hi, I'm Eftakhairul Islam, a passionate Software Engineer, Hacker and Open Source Enthusiast. I enjoy writing about technical things, work in a couple of startup as a technical advisor and in my spare time, I contribute a lot of open source projects.


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