UI Monitor problem: bad refresh/tearing effect in CentOS

Hi everybody!

First post here. I hope these forums grow and grow and endup replacing the ill-fated facebook! :smile:

I have an annoying tearing effect in my monitor. I have a HP Z27x G2 via displayport. Only under centos, a kind of tearing is noticieable. I guess “tearing” is not the appropiatte word. It’s the common bad Hz refresh problem when I move fast any element (window, thumbnail…) of the desktop or any app. Also it affects in fast pan cams, playing any kind of movies under any app.

Testing the monitor in other machines with Win or Mac, everything is OK. The problem is only under centos. Theoretically, monitor is running at 60hz. I can’t figure out how fix it. And especially, how edit the awful conf.org.


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Well, I found the solution unexpectedly. The tip is add next setting into xorg.conf. For those who want to test it.

"{ ForceCompositionPipeline = On }"

First, look for the section “screen” enabled according the profile activated. In the line with “metamodes” settings add it after monitor setting, in the next way:

In my case , I have two monitors (connected via display port), tagged as DP2 and DP4

Option “metamodes” "DP-4: nvidia-auto-select +0+0 , DP-2: nvidia-auto-select +2560+0 "

After edit it:

Option “metamodes” “DP-4: nvidia-auto-select +0+0 { ForceCompositionPipeline = On } , DP-2: nvidia-auto-select +2560+0 { ForceCompositionPipeline = On }

After log out / log in, the tear effect was gone. But I can’t test it in flame currently. Just on desktop and other apps.

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