NvFBC breaking G-Sync and VSync

Graphics / Linux Linux
1

Hi, I’m using the Nvidia Capture SDK :

https://developer.nvidia.com/capture-sdk

And it seems that using NvFBC is breaking G-Sync (even the NvFBCCUDAAsync sample code breaks G-Sync while running, indicator print “Normal”, previously printing “G-SYNC”). Enabling the Graphics API Visual Indicator shows BLIT for applications that were previously using FLIP. Running NvFBC also cause screen tearing for all applications, so I guess it also breaks VSync even if the indicator says it’s enabled.

Tested on :
Ubuntu 20.04 / 20.10
Driver 460.39 / 460.67

2

Late reply, but enabling direct capture fixes this issue. Note that you also have to enable push model to enable direct capture and if your driver is older than 515.57 then you also need to disable cursor capture.