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Move your mouse pointer to the top left corner of the screen. This happened to me after accidentally bumping my mouse. Took me forever to figure out what gesture caused it. It's nowhere to be found in the KDE docs.
Do you have desktop effects turned on? I tried this on my lappy (effects are off) and it did not work. I tried it just now on the desktop where effects are on and it worked.
Ok,its enabled but i still can;t get it to do anything
Did you go to the screen edges tab as mentioned above? When you see that tab you will see red squares. Click on one to pick the effect. It will turn the square green. Save it and the are you just set should give the effect you added for that box.
Hmmm, on my general tab I have desktop effects enabled is checked. Then I have the same setting as you have for the upper left corner on the screen edges tab (are you clicking apply after you select? I did not the first time I tried it and it did not work). For me to make it work the cursor is up in the corner and held there until the effect kicks in. I also set the middle top to a different one and it works as well. I even set the right side to kick off the cube. I notice when I set one my screen and hit apply the screen goes black for just a brief second and then comes back.
If yours is set the same I am not sure what may be wrong.
[Edit] I have noticed that if a window is up in the corner sometimes it takes a little playing to get the effect to start.
yep, I'm enabled there too, tried moving it to the top center and enabeling another at the bottom center and nothing. Odd thing is it worked once but i don't know how I did it.
Ok, I disabled and attempted to re-enable and got
Failed to activate desktop effects using the given configuration options. Settings will be reverted to their previous values.
Check your X configuration. You may also consider changing advanced options, especially changing the compositing type.
Ok, works as root. I've added myself to a bunch of groups like audio, video, dbus, etc and I can't control my volume, or mount flash drives or the desktop features like this. Wonder what group I need to be in.
Ok, wait, the first couple do work, the last three don't, the desktop cube and such, maybe its decided my system is too slow or something, I wish this were documented.
Ok, wait, the first couple do work, the last three don't, the desktop cube and such, maybe its decided my system is too slow or something, I wish this were documented.
I think there's some kind of bug in kde 4.2.4 so that while playing with different opengl and compositing options in systemsettings/desktop effects it sometimes fails to activate compositing later even after reverting all changes. I had to delete the configuration file from ~/.kde/share/config to get the functionality back - i don't remember exactly, maybe a file with 'plasma' in its name.
Actually, while setting up kde4 desktop to my liking, i was having quite many cases when i had to delete .kde and start anew due to messed up configuration files. After i got everything set up it worked as expected, but playing around with settings turned out to be not so foolproof as with kde3.5.
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