Reduce brightness

I have just installed Zorin 15 on an Asus Transformer T100H and want to reduce the brightness of the screen. The keyboard buttons don't work. Is there anyway that Zorin can do the job. Perhaps there is a night light feature somewhere - or an app that could be installed. Please help if you can. Thanks

Please provide the output of sudo lshw-c video.
Additionally, if you have two GPUs, can you check if you can turn off one of them in BIOS settings?

click on the battery icon

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@naggis which edition of Z15 do you have. e.g. Lite, Core etc.
Can you please edit your forum profile to indicate it there. Thanks.

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