Bug 418579

Summary: Automatically disable compositing if full-screen game is running
Product: [Plasma] kwin Reporter: postix <postix>
Component: compositingAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED INTENTIONAL    
Severity: wishlist CC: postix
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Other   
OS: Linux   
See Also: https://bugs.kde.org/show_bug.cgi?id=416305
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description postix 2020-03-07 12:15:04 UTC 
When playing a game one may want to disable compositing to enhance the performance but also to avoid effects when moving the mouse to the edge of the screen. For example I have set a trigger for the desktop grid in the lower left corner.

Right now it's hard to tell if the compositor is enabled or disabled if you use the hot keys (#416305).
I test it by actually moving the mouse to the corner...
It's way too cumbersome to always open the systemsettings and navigate to the setting's page.

However, it were even better if the compositor becomes automatically disabled whenever a full screen game runs, so that the player does not need think about it.

When changing the virtual desktop to one where no game is running, it may be enabled again automatically.

Is this possible? Does it make sense to you? :)
Comment 1 Vlad Zahorodnii 2020-03-10 12:23:48 UTC 
KWin has no knowledge about whether the given window is a game or a terminal, etc.

On the other hand, the game could set _KDE_NET_WM_BLOCK_COMPOSITING on its window to block compositing.

You could also create a window rule for the game to block compositing.
Comment 2 postix 2020-03-10 12:51:26 UTC 
Got it, thanks! I will look into it :)