If I enable Blur effect and I try to use Takeoff (for example) tearing will appear. It also happens when I use the Calendar and the Network Manager. I'm using Kubuntu 13.10, KDE 4.11.3 and OpengGL 3.1 (raster). It isn't probably a hardware problem because in KDE 4.10.X it worked very well without any tearing, anyway I'm using the i915 driver and my graphic card is an IntelHD 3000. This bug is also happening on another computer that I have (Sony Vaio) with IntelHD 4000 graphics, also in Kubuntu 13.10, KDE 4.11.3 and OpenGL 3.1 so for me it's always reproducible. Thanks Reproducible: Always Steps to Reproduce: 1. Activate Blur Effect 2. Use Plasma (i.e Takeoff) Actual Results: Tearing appears, the screen will tear. Expected Results: It should work fluid and not produce the well known tearing effect. It happens in my two computers and wasn't happening in KDE 4.10.X so It may be a software problem/bug or something.
run "kcmshell4 kwincompositing", on the second tab, filter for blur and check the configuration. is caching enabled?
(In reply to comment #1) > run "kcmshell4 kwincompositing", on the second tab, filter for blur and > check the configuration. is caching enabled? Yes it was enabled. I disabled it and now it works like a charm! Should this "bug" be closed? my problem is solved but the behaviour shouldn't have tearing regardless of the configuration, right? (I don't know what caching actually means). Thanks
(In reply to comment #2) > the behaviour shouldn't have tearing regardless of the configuration, right? No, unfortunately it's not a trivial bug. See dupe. FYI: "tearing" is usually sth. different and refers to old and new frames on different parts of the screen. *** This bug has been marked as a duplicate of bug 307112 ***