Illuminated keyboard not lighting up with Mint Cinnamon 20.1 Ulyssa.

Hi. I bought a KUIYN illuminated keyboard and mouse which work fine with my Win10 install, but with my Mint Cinnamon install the keyboard doedn't light up. It will do until Mint finishes loading, then the lights go off and I can't get them back on again using the key that should turn them on. I am new to Linux at present. Can anyone help with this please? I need the illumination as the light where I am isn't great,

Thanks, MMM.