HP EliteBook 8440P Screen Flickers – Ambient Light Sensor:

Had this laptop with Windows 7 and sent twice to HP to fix and replace the display and every time it came back I had the same issue with the screen flickering. The following seems to have fixed it.

1- Download and apply the latest HP drivers and BIOS updates from HP website for the HP laptop.

2- Important: Run Windows Updates to download and install any available video driver (in my case it was nVidia).

3- If that does work, reboot laptop and boot to BIOS and disable Ambient Light Sensor.

4- You might also need to disable power management of the screen and prevent it from going to sleep.

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