After the BIOS update, the light does not work

I upgraded my BIOS 83ET78WW T420 (1.48), but now my microphone mute button and brightness controls no longer work. When I adjust the brightness, the indicator appears in the display, but it does not actually.

Are there updates more that I have to apply to get this working? I don't want to install all the additional tools of lenovo to get my screen to work, what is needed. If we need more information on my system, let me know.

Material: T420

BIOS: 83ET78WW (1.48)

OS: Windows 10

Thank you!

I found the solution. The Intel HD graphics card drivers have been somehow erased when I upgraded. Enter devmgmt.msc and re-install the drivers solved the problem.

Tags: ThinkPad Notebooks

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