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It is impossible to change the screen brightness with the hotkey (F11 and F12), or even with the slider in settings. This is a crap laptop. Wifi did not work from day1. For a while I turned off bluetooth to make wifi work. Even then the signal was very weak. Eventually it stopped working completely. Contacted lenovo support, the tech updated. Updating drivers won't help since P400 is not supported from Lenovo for Windows 10. Really upset about that. Though their Thinkpads are good, most likely will not buy a Lenovo again, especially Ideapad. Anyways, good luck! Right, I'm currently running Version: 9. Brightness control works, display to a second display. What I did was reboot and when I saw the Lenovo logo on boot up I hit the brightness key and watched the screen get brighter. When I saw that I almost had to go back to K-Mart because I could not believe how easy that was. I still don't have brightness control, but I'm no longer having to squint my eyes to look at the screen or work in the dark.

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This troubleshooting page will help you diagnose common problems with the Lenovo IdeaPad P400 Touch.

Battery is not charging

Battery icon does not indicate it is charging.

Faulty Power Cord

Ensure that the charging cable is plugged into both the wall and the laptop. If the Lenovo IdeaPad P400 Touch does not indicate that it is charging, the problem may be the power cord.

Improper Power Saving Settings

If the Lenovo IdeaPad P400 Touch displays a message similar to “60% available, plugged in not charging,” this can indicate that power saving options are enabled. To disable them, access Lenovo Energy Management in the taskbar. Choose the the option “Optimize for Battery Runtime.”

Faulty Firmware

The Lenovo IdeaPad P400 Touch contains a function that can accidentally disconnect the battery. Install this firmware update from the Lenovo site.

Faulty Battery

If none of the above solutions work, the problem may be a faulty battery. See this replacement guide to replace the battery.

Touch functionality not working properly

The screen does not respond when I touch it.

Outdated Drivers

Update the display drivers to the current version listed on the Lenovo support website.

BIOS Settings Need to be Reset

Power down the laptop. Press the One Key Recovery button next to the power jack and select Bios Setup Utility. When on the BIOS screen, press F9 to load the default options. Press F10 to save these options and exit. To test if this worked, access the calibration tool. To access the calibration tool, swipe your finger across the screen starting from the right side. Select search. Type “calibrate” in the search box. Select settings, and then select “Calibrate the screen for pen or touch input.” Select “Calibrate” and follow the on-screen instructions.

Faulty Firmware

The screen may be malfunctioning due to faulty firmware. You will need to upgrade the firmware to fix the issue. Navigate to the Lenovo IdeaPad P400 Touch Drivers & Software webpage. Select “Display and Video Graphics” to show all drivers and firmware in this category. Select “TouchScreen Firmware Upgrade for Windows 8 (32-bit, 64-bit) - IdeaPad P400 Touch” to download the firmware. Once it has downloaded, run the program to update the firmware. When the program has finished running, reboot the laptop. To test if this worked, access the calibration tool. To access the calibration tool, swipe your finger across the screen starting from the right side. Select search. Type “calibrate” in the search box. Select settings followed by “Calibrate the screen for pen or touch input.” Select “Calibrate” and follow the on-screen instructions.

Faulty Touchscreen

The touch panel (digitizer) or the touch panel (digitizer) board may have gone bad. You will need to replace it.

Laptop will not boot

The device powers on but the screen stays black.

Faulty Display

To check if the display is faulty, plug in a second display to the laptop. If the second display functions properly, the laptop may have a faulty display. Serial port component for lazarus come follow me. You will need to replace the screen.

Problem with Operating System

Perform a factory reset of the laptop. Please note that performing a factory reset will delete all files you have stored on the laptop. To perform a factory reset, power the laptop down. Press the One Key Recovery button located next to the power jack. Select the option to run the recovery program.

RAM Error

Perform a hard reboot to reset the computer's working memory, or RAM. Unplug the computer from the power cord. Remove the battery following this guide. Plug the computer in and reboot it. If the computer boots, power it down, replace the battery using this replacement guide, and reboot the computer.

Faulty GPU or Motherboard

If none of the above solutions has fixed the problem, you may have a faulty GPU chip or motherboard. The GPU chip is embedded on the motherboard, which means that the whole motherboard will need to be replaced.

Keyboard not working

Keyboard does not respond to keystrokes.

Dirty Keyboard

Dirt and dust can build under keys over time. Use a can of compressed air to clean under keys.

Keyboard Drivers Are Outdated

Outdated drivers can cause hardware not to function properly. Navigate to Device Manager to check for and install the latest drivers. If you need to type a password to login, use the onscreen keyboard. You can also find keyboard drivers on the Lenovo support website.

Faulty Keyboard

If no other method of troubleshooting can restore keyboard functionality, use this replacement guide to replace the keyboard.

Screen brightness won’t adjust

Screen stays dim even after pressing the button to adjust brightness.

Drivers Are Not Compatible

Newer display drivers may not be compatible with the Lenovo IdeaPad P400 Touch. Revert back to an older drivers to restore functionality. You can find display drivers on the Lenovo support website.

Faulty Screen

The Lenovo IdeaPad P400 Touch LCD screen backlight may be faulty. If no other method of troubleshooting can restore brightness, you may need to replace the laptop screen.

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Note: This article was updated on 2020-12-07 and previously published under WIKI_Q210794

Lenovo Ideapad P400 Brightness Control Not Working