i915 Video Tearing

[spacecase-25]

'm using FOSS intel graphics drivers with Kernel 3.8.0-29 and Kubuntu 13.04. There seems to be video tear at the top of my screen. It's apparent when I'm dragging windows around or playing video back in full screen. I've been googling and apparently there's a tear free option that I can put into an xorg.conf file? However, I do not have an xorg.conf file and I am not familiar with the syntax to set one up.

So this is really a 2 part question. 1) I'd like to try to xorg.conf option, so what would I need to put into the file to set it up? 2) If that's not the way to fix this, has anyone found a way to fix it? I'm not looking to disable compositing, as it's just the top of the screen and I can sort of deal with it, but it's bumming me out.

Thanks.

[Snowhog]

What shows in System Settings > Desktop Effects > Advanced and set Compositing type and QT graphics system and OpenGL Options > Tearing Prevention (VSync)?

[spacecase-25]

What shows in System Settings > Desktop Effects > Advanced and set Compositing type and QT graphics system and OpenGL Options > Tearing Prevention (VSync)?

Compositing type is OpenGL and QT Graphics System is Native. Vsync is enabled.

[Snowhog]

Try setting Tearing Prevention (VSync) to Automatic.

[spacecase-25]

Try setting Tearing Prevention (VSync) to Automatic.

I don't see that option

[Snowhog]

Uncheck Use VSync

[spacecase-25]

Uncheck Use VSync

That makes it worse. With vsync checked there is only tearing at the very top of the screen, but with it unchecked it happens all over.

[Snowhog]

Try setting Compositing type to xRandR.

[dmeyer]

Try setting Tearing Prevention (VSync) to Automatic.

This is the correct path but what you fail to recognize is that he isn't using 4.11. He needs to install 4.11 and then choose automatic. I would not switch to the XRender backend because it is pointless when one has a GPU that is capable enough at OpenGL.