G-Sync In Linux
From QWiki
Do you play Quake on A G-Sync capable monitor in Linux? You've came to the right place how to turn it off!
Turn off G-Sync example (This will let the LED go white to not announce G-Sync)
nvidia-settings -a currentmetamode="2560x1440_120 { AllowGSYNC=Off }"
nvidia-settings -a currentmetamode="2560x1440_144 { AllowGSYNC=Off }"
nvidia-settings -a currentmetamode="2560x1440_165 { AllowGSYNC=Off }"
And turn it on:
nvidia-settings -a currentmetamode="2560x1440_165 { AllowGSYNC=On }"