https://www.displayfusion.com/Discussions/RSS/?TopicID=f79b4f86-4e05-4500-bf06-3fe15a8cff1b DisplayFusion RSS: Secondary monitor dim breaks NV G-Sync Compatible and/or high refresh rates on primary Thu, 18 Jun 2026 08:24:10 GMT en hourly 1 https://www.displayfusion.com/Discussions/RSS/?TopicID=f79b4f86-4e05-4500-bf06-3fe15a8cff1b https://www.displayfusion.com/Discussions/View/secondary-monitor-dim-breaks-nv-g-sync-compatible-andor-high-refresh-rates-on-primary/?ID=f79b4f86-4e05-4500-bf06-3fe15a8cff1b#2 Thu, 08 Aug 2019 14:39:39 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/secondary-monitor-dim-breaks-nv-g-sync-compatible-andor-high-refresh-rates-on-primary/?ID=f79b4f86-4e05-4500-bf06-3fe15a8cff1b#2 DisplayFusion It is indeed a Windows thing

If a window on the second monitor is using DWM (like the Monitor Fading), Windows will drop the refresh rate on the Primary monitor to match the one on the second monitor.

Sorry for the bad news there! ]]> https://www.displayfusion.com/Discussions/View/secondary-monitor-dim-breaks-nv-g-sync-compatible-andor-high-refresh-rates-on-primary/?ID=f79b4f86-4e05-4500-bf06-3fe15a8cff1b Wed, 07 Aug 2019 23:19:35 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/secondary-monitor-dim-breaks-nv-g-sync-compatible-andor-high-refresh-rates-on-primary/?ID=f79b4f86-4e05-4500-bf06-3fe15a8cff1b DisplayFusion This probably will end up as "Windows thing, can't fix" but here goes.

I use DisplayFusion's secondary monitor dim functionality, but I came across a tricky bug that took a lot of swearing, display cable switching, swearing, refresh rate fiddling, and swearing to diagnose.

The situation:
- Nvidia GTX 1080 Ti
- 2560x1440 @ 144 Hz, primary, FreeSync, so G-Sync Compatible (works fine)
- 1920x1080 @ 60 Hz, secondary

The bug:
- When the secondary display is dimmed via DisplayFusion, (a) FreeSync doesn't kick in on the primary, (b) even though it's at 144 Hz, the actual visible refresh rate seems closer to 60. ]]>