ASUS 笔记本上安装 Ubuntu后，Fn功能键无法正常工作。尤其是屏幕亮度无法调节、无法通过Fn关闭显示器。
网络上提供的解决方案如下，（该链接无法打开，此处从快照上保存）：
Enable Fn Keys On Your Asus EeePC and Ubuntu
It's both nice and bad when I upgrade to a newer Ubuntu version. The good part is I have lots of posts material for the blog but the bad part is there's always something on my main computer or netbook which doesn't work out of the box and needs tweaking.
I really didn't expect the Fn keys to work out of the box on my Asus EeePC 1005HA (so this method has only been tested for this Asus EeePC model, I don't know if it works on others) and unfortunately I was right. However, the fix is very quick. Here's what you have to do.
Notice: editing the Grub can be dangerous so be very careful not to change anything else!
To enable the Fn keys on an Asus EeePC 1005HA (possibly other models too) with Ubuntu, open a terminal and type:
sudo gedit /etc/default/grub
and search for the line that says:
GRUB_CMDLINE_LINUX_DEFAULT
This line should originally look like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
Add acpi_osi=Linux to the end of the line, before the closing quote. Basically after you edit it, the line should look like this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
Once you're done, save the file and run the following command:
sudo update-grub
Now reboot!
但是，遗憾的是，上述方法并没有解决问题。
下面给出了另外一种方法
Problem
If you just updated to 10.04 and you might be experiencing issues with your function keys supposed to control screen brightness on my Asus UL30a It worked fine in 9.10.
Workaround
Open up Terminal and enter the following
gksudo gedit /etc/default/grub
Look for the line that says GRUB_CMDLINE_LINUX and add this
GRUB_CMDLINE_LINUX=”acpi_backlight=vendor”
Save it and then update Grub
sudo update-grub
Reboot your system.
修改vendor为 asus。