Windows 10: Laptop screen at full brightness suddenly went very dim

My 2 year old laptop in tablet mode suddenly went dark. The first time i thought it was black. I restarted and it helped. This only happens when my device is in tabler mode. When i use it like a regular laptop i never see this. Any solutions?

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Unable to dim brightness in Dell Studio 1749 laptop

Unable to dim brightness in Dell Studio 1749 laptop: everything I have tried does not allow me to dim the over-bright screen using the win 10 customization tools? Most suggestion offer tweaks that might not be reversed?

 

Laptop Screen Brightness is not the same as Secondary Monitor's brightness

After I installed windows 10, I noticed that the screen brightness on my laptop's screen was dimmer than the brightness of my secondary monitor. Not dim enough to suggest a problem with the lamp, but just dim enough to be annoying, as though it was turned
down in the settings. I went through and tried to change the screen brightness, but it failed to be effected. Is there anything I can do to fix it?

 

Screen Brightness Dim

Recently upgraded from Windows 8.1 to 10. The screen brightness remains dim even when the brightness key is pressed, with or without the Fn key, The indicator cursor does move up and down but no effect on the brightness level.

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My laptop is LENOVA IdeaPad Z 500