Rec. 1886 is really only intended for displays in a controlled mastering environment. It stretches the tonal range (reduces gamma) near black to compensate for a display with elevated black levels in a dark room.
If you're using any room lighting, and the blacks on the TV actually look "black" though, then you shouldn't need much gamma compensation near black, and a "flat" gamma (in the ~2.4 range) should work reasonably well.
If you change the Gamma setting on the display btw, then you must recalibrate Brightness to keep reference black (Y'=16) at the display's MLL, to prevent shadow detail from being either clipped or elevated. The lower you set the Gamma control, the higher you'll need to set the Brightness control to keep shadow detail from being clipped.
Cell Light and Contrast also effect the Brightness setting. So set Brightness last after making changes to any of the other color controls on the TV.
Last edited by ADU; Yesterday at 09:20 PM.