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Found the problem (escalated to support) :-) The System Image graphics driver is not installed correctly - any updates after installation do not rectify the problem. Events Device PCI\VEN_8086&DEV_46D2&SUBSYS_80231E50&REV_00\3&11583659&0&10 requires further installation. Anyo...

Hiya, all drivers OK - Settings - Display shows slider but that has no effect either. I even tried a fresh System reinstall from WINPE USB as posted here the display sliders were the same, having no effect, this was before any updates took place. Still the same after updates. Puzzling?

Thanks so much for quick reply, those function keys don't work - whilst the slider may change the brightness doesn't

Having just purchased AX15 (and also AK2 Plus a few months ago) - both of them I am unable to adjust brightness? Is there a fix for this - is it a known problem? tried usual reinstalls etc.