compiz leads to flickering

[Benjamin Kampmann]

On compiz system with other windows in background, elisa is flickering: work-a-round could be to automatically hide all other windows, if we are in compiz-enviroment.

[Benjamin Kampmann (benjamin-fluendo)]

done in [changeset:3769]

[Florian Boucault (fboucault)]

review done, some fixes needed

[Benjamin Kampmann (benjamin-fluendo)]

fixed in [changeset:3772].

[Florian Boucault (fboucault)]

This should be used instead of 'ps':

http://library.gnome.org/devel/gdk/2.12/GdkScreen.html#gdk-screen-is-composited

[Loïc Molinari (loic.molinari)]

Or even better, since i'm seeing that you're using wnck, the library can retrieve that information through the wnck_screen_net_wm_supports function. I didn't get a look at the Python equivalent, but you just need to give as parameter the correpsonding _NET_WM atom which is _NET_WM_CM_Sn, where n is the screen number. You can retrieve the screen number with wnck as well.

[Florian Boucault (fboucault)]

Also:

s.toggle_showing_desktop(True)

hides _all_ the windows (Elisa included) and this is obviously not good.

[Benjamin Kampmann (benjamin-fluendo)]

Florian: did you at least test it?

It is not hiding the elisa-windows, because the elisa window is not existing yet. You would have seen that. Do you really thing I would commit this code without testing it?

On the other part: I'm not sure that detecting the 'composite' possibilities means to detect ''compiz'' always. And the wnck_screen_net_wm_support [1] related specification does not say anything about compiz or composite.

Anyway. It is working for now and also marked as a work-a-round. We should fix this in a better way after the release: '''postponded'''!

[1] http://standards.freedesktop.org/wm-spec/wm-spec-latest.html

[Florian Boucault (fboucault)]

I tested it on Feisty and all the windows are minimized. It's probably done asynchronously by the window manager.

Loïc: what do you think about the wnck_screen_net_wm_support thing?

[Loïc Molinari (loic.molinari)]

The problem appears with compositing window managers, and it's not only a Compiz issue. What about beryl or compiz-fusion for instance? This is a known issue with accelerated OpenGL applications running over a compositing window manager. The solution requires deep changes in Xorg and the DRI drivers, some people are working on that and this is called Redirected Direct Rendering. If you want more information you can take a look at https://wiki.ubuntu.com/RedirectedDirectRendering.

I confirm that wnck_screen_net_wm_support is the good way to check for it. You just need to retrieve the screen number and give the "_NET_WM_CM_Sn" string as parameter, the function will return whether or not compositing is supported by the window manager.

[Benjamin Kampmann (benjamin-fluendo)]

okay. desktop toggle is fixed in [changeset:3786]. the dectecting is not working on my feisty with gtk.gdk or wnck. So we stick to ps for the release.

postponded

[yyoyo (lionel.martin)]

Please disable the window minimize

[Benjamin Kampmann (benjamin-fluendo)]

[changeset:4844 window minimize disabled]. everything gets postponed

[Florian Boucault (fboucault)]

Issue Elisa cannot do anything about.

[Andy C. (ndc)]

Try disabling the Desktop Cube in Compiz. It worked for me.