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I get this too.

The on-screen display image appears on the screen when I try to make the change but has no effect.

This happened on previous versions of Fedora (I think it's the same with openSUSE, and when using Gnome or KDE).

I always thought it was because I was using an on-board Intel graphics (Ironlake Mobile) card/driver.

As a workaround, I can change the brightness during the boot process, i.e. when the Kernel/Rescue option is displayed, but not while the system is running.

Can you do this?