lenovo ideapad p400 brightness control not working

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I own an Ideapad Z-500 notebook running Win 8.1.After updating Intel graphic adapter from Windows Update the screen brightness adjust key (F11 and F12) stops working and I cannot adjust my scrren brightness.I have to uninstall it and disable Windows update to keep using my laptop.

Blogspam, mobile links and URL shorteners (such as tinyurl or bit.ly) are not allowed. Lenovo P/Y/Z Series :: IdeaPad Z500 - Screen Brightness Adjust Key Not Working Feb 4, 2015.

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Lenovo Ideapad S145-15API Precision Touchpad Driver not working. Comments or posts that are disrespectful or encourage harassment of others (including witch-hunts of any kind) are not allowed. I ve checked the Intel Graphics Control Panel and there are no settings I can find. Microsoft Community Chat Helpful resources

Lenovo ideapad p400 brightness control not working