Arch Linux

KoSv

Member

Registered: 2020-10-12

Posts: 2

T450S Video Tearing -> Composite Bug Discovered?

Hi there,

my first post.

After I've disabled the Composite option in the window settings,
I've got massive video tearing in my web browser (like in the good old days...).

Enabling it again and the tearing was gone.

Can someone confirm?

Greets and sorry for bad spelling!

KoSv

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,645

Re: T450S Video Tearing -> Composite Bug Discovered?

This is absolutely expected. What's the bug here? Also which "window settings" are you talking about? Which instructions did you follow to install Arch Linux ?

Last edited by V1del (2020-10-12 12:01:15)

KoSv

Member

Registered: 2020-10-12

Posts: 2

Re: T450S Video Tearing -> Composite Bug Discovered?

This is absolutely expected. What's the bug here? Also which "window settings" are you talking about? Which instructions did you follow to install Arch Linux ?

of course, sorry.. forgot to mention my window manager.
So I'm using xfce4 and my settings manager is the xfce4-settings-manager..
The window settings I'm talking about is under: xfwm4-tweaks-settings.
If I disable composit there I get video tearing.
Why is this expected?

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 21,645

Re: T450S Video Tearing -> Composite Bug Discovered?

Others might be able to give a better explanation but the gist is:

Standard xorg drawing operations have no concept of syncing to the display, a compositor's job is to map these into a accelerated context using OpenGL or so and they do have that concept and can appropriately sync the changes to the display's output rate.