03-18-2013 03:31 PM
the problem Im facing with ideapad z400 is,when I pressed the brightness control (up or down), it will respond ones/ twice then stuck.. Already re-install the windows update the drivers. I'm looking for bios firmware,but it's not website.
Solved! Go to Solution.
03-20-2013 03:37 PM
Welcome to the Lenovo Forums.
If you're using Windows 8, can you download and install the file below and try to press F11/F12 to adjust the brightness.
Lenovo Energy Management
Let me know your findings
03-21-2013 11:19 AM - edited 03-21-2013 11:40 AM
i found the problem...it's the intel HD 4000 graphics driver,if you updated it ,the brightness control start to messed up....it's only work with outdated driver.(originally installed when i bought the laptop.) i downloaded the driver from lenovo chinese site.
03-21-2013 09:51 PM