A minor Everquest problem

Hi Folks;
I’m running Mint 19.3. A Nvidia 2070 card using the 460. 67 drivers. Lutris 5.8.3 with the lutris 6.4 wine version to run everquest. It runs great with winetricks on and Dxvk off, in both windowed and full screen modes. The one problem is that the gamma slider is the game does not work in any mode. The light level in the game is fine so it’s perfectly playable, but I would like the slider to work. Thanks in advance for any help.