PROBLEM
As of January 2018=9, the problem still arises when an unsuspecting user attempts to control the screen brightness by using F11 (neg brightness) or F12 (positive brightness) with Windows 10 OS.
Upgraded to Windows 10 on Lenovo Ideapad p400 touch, screen went dim Hello,I just installed the free Windows 10 upgrade on my Lenovo Ideapad p400 touch last night. I woke up this morning and booted up my computer, and everything was fine until I attempted to change the brightness. When I tried to do this, my screen. Lenovo Ideapad 320s 141 KB Replace SSD: Question Lenovo IdeaPad flex10 not starting: Question Ideapad 330 Ryzen variant: Lenovo ideapad P500 pluged in not charging prob. Choosing between Dell Inspiron i5 6200/15' 1920 touch screen/ 12GB/1TB/DVD and Lenovo Ideapad 500 i7 6500/ 15' 1920 non touch: New Lenovo Ideapad 510p. Laptops and netbooks:: ideapad p series laptops:: ideapad p400 touch notebook Lenovo PC Support - Lenovo Support US. Symptom On IdeaPad P400 touch, the screen brightness won't change, despite the graphic on the screen shows the meter goes up and down. After checking all drivers, uninstalling and reinstalling lenovo energy management, the problem still exists.
Under certain scenarios, this results in screen going to the darkest setting and F11 or F12 keys will not change the screen brightness.
Lenovo dim screen problem.
With Windows 8, you could have defaulted to Microsoft Display driver to fix this problem, but this solution is no longer available under W10
Ideapad P400 Touch Drivers
APPLICABILITY
This solution is applicable to IdeaPad Z400 and Windows 10
SOLUTION
You will need to downgrade the video driver. Unfortunately, if you attempt to change the brightness, the screen will go dark and you will need to re-install this driver.
- Step #1 – Search for “Lenovo IdeaPad P400 Intel video driver” (https://support.lenovo.com/us/en/downloads/ds031547)
- Check your Windows version an download the appropriate version. For example, if w10 is 32 bit, then download the 32 bit driver (1hvi13w8.exe); for the 64 bit version, download the 64 bit driver (1hvi14w8.exe)
- Double click to unpack (don’t worry, the screen will say installing – ignore this message)
- Once unpacked, you will get a pop up screen to install (again). Uncheck the box and click FINISH
- Using Windows Explorer (file manager), go to C:driversintelintel video drivers then double click setup.exe to install
- Reboot and your problem should be fixed!
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Reference Links
Ideapad P400 Brightness Not Working Lenovo
- Lenovo Forum – Ideapad Z500 Touch Win 10 Brightness Problem