Miguel Pelaez

Hey, I tried to debug this issue. Using the official Minecraft mappings, at the class GameRenderer, the problem seems to be the calling of

this.postEffect.process(float2);

If you disable just the post effect call, everything works. So the surrounding code is not the problem.

RenderSystem.disableBlend();
                RenderSystem.disableDepthTest();
                RenderSystem.disableAlphaTest();
                RenderSystem.enableTexture();
                RenderSystem.matrixMode(5890);
                RenderSystem.pushMatrix();
                RenderSystem.loadIdentity();
                this.postEffect.process(float2);
                RenderSystem.popMatrix();

So the PostPass class is the problem, the process method to be specific.

Confirmed for 1.15.2

This would be a very good fix to do in 1.15 as it's intended as a bug fix update. Incredible work by the community, it fixes almost any redstone lag on my test server.

Same, with 1.13.2 vanilla

Same issue here, I'm trying to launch Minecraft 1.7.10 and 1.8.9 on Minecraft Launcher 2.0.1005-dev, Arch Linux