• Found on Windows Intel/NVIDIA hybrid graphics, using the internal screen and Intel graphics.
• Only occurs in Borderless Fullscreen, reason is unknown.
• Solution: Switch to NVIDIA graphics, or use windowed / exclusive fullscreen, or move to an external screen (however this is slower).

If you have any information on this issue could be fixed, or have reproduced it, please comment!

This seems to be related to GLFW calling DwmFlush() in windowed mode - I'm testing new methods of creating a borderless fullscreen window, which seem to fix the issue.

Is there a test build?

Not yet, I'm going to add a comment here when there is one.

Did you ever figure this out?

Sorry, I've been rather busy the past few months! I'll let you know when I've got something you can test. I've created #19 to keep everything relating to the changes I'm working on in one place.

This doesn't seem to occur when there is no external display connected.

Went and bought a proper card... also happens on a Radeon RX 570.

Update: tearing still happens with Radeon Enhanced Sync and/or OpenGL Triple Buffering. Also, another datapoint: I'm running Optifine 1.15.2 pre21.

Does this still happen without Optifine?

I'm experiencing screen tearing on an GTX 980Ti with V-Sync on. I'm using Optifine 1.16.1 pre2 on fabric. Please help.

I have the same problem on integrated AMD graphics (Ryzen 3 3200G with Vega 8) running at 1440p. Can share my machine for testing if needed. Maybe Vsync doesn't work?