Unable to change the screen brightness; Acer Arpire 5742G?

fall13vox

I own a 3.5 years old Acer Aspire 5742G (Core i3 M380; NVIDIA540M). the heat sink or the collinig fan might have some issue as it usually gets overheated when playing games (even CS condition zero/1.6). I don't play games anymore, so its not a problem.

 

The problem is that I am unable to adjust the screen brightness from the keyboars shortcut (Fn+ Left/Right arrow key), neither from the control panel (Power Settings).

Although I do noticed something that, if I change my brightness settings (nothing happens) and I close the laptop lid (display screen) by folding it down and openeing it back after 3-4 seconds, the brightness is now changed.

 

Please help me out what to do.

philetus

Try this:Click START, right click on COMPUTER, and select MANAGE.

Under Device Manager, select MONITOR, and right click on PnP Monitor. Uninstall and delete the drivers.

At the top of the device manager, click the button that scans for hardware changes.