[RFC] Enforcing Compositing

Dario Freddi drf54321 at gmail.com
Sun Feb 20 22:50:01 CET 2011

On Sunday 20 February 2011 13:38:40 Martin Gräßlin wrote:
> Hi all,
> sending this to both Plasma and KWin as the idea affects the complete
> workspace.
> Since 4.2 we have enabled OpenGL based compositing by default and I was
> wondering if in 4.7 we should go the next step: disabling the possibility
> to turn compositing off if supported.

I think I agree with this, provided that KWin is smart enough to detect when 
compositing won't be supported.

BTW, I think this implies I should trash the disable compositing action in 
powerdevil for 4.7, isn't it? (I would be glad to do that)

> With Mesa 7.10 it seems that the driver problems (Mesa 7.8) which hit us in
> 4.5 are finally gone and our new compositor is performing much, much better
> than the one we have in 4.6. This means from a performance perspective I am
> optimistic that we can go such a way.
> This would imply the following changes
> * Remove the enable checkbox in the compositing KCM
> * Remove the suspend/resume compositing button in the same KCM
> * Remove the "functionality checks" - the heuristic is rather useless
> anyway * Disable unredirect fullscreen windows by default
> I would keep
> * the shortcut to suspend compositing
> * the dbus call to toggle compositing (might be useful for games and so on)
> I am unsure about keeping respect to the Compositing/Enabled config option.
> I would say we do not honor it in development mode, but honor it again in
> the branch. This way users could still disable it if something goes bad.
> For development it's better to have the option not honored to get bugs
> reported ;-)
> If compositing is not supported, it will not try to enable it, so no
> problem for our old, old, old users. (Though I doubt Plasma is of any use
> in a system not supporting OpenGL).
> What do you think about this idea?
> Cheers
> Martin


Dario Freddi
KDE Developer
GPG Key Signature: 511A9A3B
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