According to Asus, this maybe an issue with the BIOS. They also said that according to responses from the BIOS team, the calling method of wmi evaluate method, returns ASUS_WMI_UNSUPPORTED_METHOD in new ASUS laptop PCs. This patch fixes it.1
As fossfreedom said, there are a couple of recent BIOS updates for your laptop. You need to make sure that your BIOS is up to date before attempting this fix.
I shared this file on dropbox, because I couldn't find it anywhere that doesn't require you to have a user name and a password.
So first you need to download the file asus-wmi-dkms_0.2_all.deb. Once you do that, just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, navigate to the folder where the file got downloaded, probably the Downloads folder, and then run the commands below.
sudo apt-get install dkms
sudo dpkg -i asus-wmi-dkms_0.2_all.deb
I hope that this works for you.
Click here to download the file
1Source:Asus VIP Tech Support
P.S. Let me know if this works. Because if it doesn't I need to let Asus VIP support know. Thanks