Excessive screen tearing

[comp500]

• 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!

[comp500]

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

[kosma]

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?

[kosma]

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

[kosma]

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

[Fridtjof-DE]

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.

[comp500]

Does this still happen without Optifine?

[comp500]

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.

[kosma]

Is there a test build?

[comp500]

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

[kosma]

Did you ever figure this out?

[comp500]

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.