Hi, i'm using KDE 4.2.4 with Compiz-fusion 0.8.2 on my Mandriva 2009.1 box, and all is working flawlessly except one annoying thing. I have tuned compiz to make my windows and menus partially transparent by adding this line in ccsm (plugin: "Opacity, Brightness and Saturation", "Windows specific settings" in "Opacity" tab):

So, it works great and all, but I couldn't find an option to turn off transparency for my screensaver (which I can run from terminal by typing ksolarwinds.kss). It's tricky, because, if I add this line to windows-specific settings:

it only makes windowed (e.g. launched from the konsole) screensaver non-transparent. But not in the fullscreen mode. And that's why locking screen become senseless.

I've already tried
but that didn't worked.

Any help would be greatly appreciated, and forgive me for my not-so-good English (if there was any).

Strange. I had this problem. But a couple of updates later, it went away by itself.
Try the Legacy Fullscreen & QT Window workaround.

Thanks for the reply. I've tried to enable those workarounds, but the problem wasn't solved. When I was googling for solution, I found one for GNOME: seems that adding
to the window rules list solves the problem. Why this doesn't work in KDE ? Also, they are using
which is also ain't working for me (but this could be because that thread is quite old).

I remember solving this in KDE3.5 using name=kdesktop_lock
But seems this file is no longer there for KDE4. Gotta find it's KDE4 incarnation.

Ok, when I messed with settings a bit, I found a solution. You need to enable "Legacy fullscreen support" workaround, but NOT a "Qt Windows fix" workaround (which, for instance, somehow drops the compiz at my system ) AND add to the windows opacity rules. That did the trick for me.

Thanks for pointing me in the right direction