OpenGL vsync bug in macOS Ventura affects frame flip detection in PsychoPy

[danielkimmel]

I’m also having this problem in MacOS Ventura 13.2.1

"TimeByFrames" script and quantisation error

Any more developments on this topic? I’m getting the same thing on multiple Macs running MacOS 13.2., using both the native and external displays. Some of the Macs have “Promotion” (120Hz – though I’ve also set it to 60Hz), some have 60Hz natively. Regardless, the distribution is bimodal at ~4.5ms and ~12ms. In theory, the mode should be 16.7ms [image] This may be related to the “triple buffering” on later MacOS’s (which is happening in addition, since flipping using win.flip(clearBuffer=F…

Anyone have any fixes/workarounds for this?