How can I lower the refresh rate of an emac?

Question

An Optoma 716 projector accepts rates no more than 85 Hz. When the Emac screen resolution is lowered to 1024 x 768 or less, the refresh rate automatically increases to above 85 Hz. How can I get around the Display Preferences settings to match a resolution of 1024 x 768 with a refresh rate of less <= 85?

Answer 1

The setting is most likely built into the hardware.