1. It is recommended that you download the corresponding graphics card driver and reinstall the ATKACPI driver in official website (you need to confirm whether the machine is X57Vc, X57Vm or X57Vn first). Official website drive download path method:
Www.asus.com.cn- Service and Support-Download Area-Enter the notebook model, click "Search", then select the system (for example, win 7 64 bit)- display driver, download the ATKACPI driver and ATK hotkey utility program in "Utilities", and click "Global".
Restart the computer after downloading and installing the driver, and press Fn+F6 to adjust the screen brightness.
2. Press F2 to enter the BIOS interface to see if the screen brightness is normal, or try to press Fn+F6 to increase the screen brightness in the BIOS interface.
If the brightness of the BIOS interface is normal, or the brightness can be adjusted, the notebook screen hardware is normal, which is usually caused by the installation of a non-pure version of the operating system and poor compatibility with drivers. It is recommended that you back up and save important data first, and then reinstall the system through the pure version system CD.
I hope the above information can help you! Thank you. If the above reply still can't help you solve the problem, you can log in to ASUS Online Instant Easy Service:/Impressionile/imlink.html for further consultation with engineers to help you solve the problem!