Created attachment 50805 [details] Glxinfo file Version: unspecified (using KDE 4.5.0) OS: Linux Once I installed kde 4.5 blur was activated by default and my system became really slow. Some dialogs blinked. Sometimes, after some usage, the X server crash. Looking at the CPU usage, it was above normal (30%-50% on either cores) but windows didn't move smoothly. I'm sorry, but I'm back in kde4.4 now (other issues regarding to dual screen configuration made me downgrade to 4.4) Reproducible: Always Steps to Reproduce: Enable blur effect Actual Results: Huge drop in performance Sometimes X crashes after some usage.
It is totally fine to disable the blur effect if it is causing problems for you. That's why it is optional, but enabled by default, because only drivers supporting this effect can use it. Unfortunately some drivers say that they support it, but in truth they don't. That is not our bug, but theirs. We even introduce a blacklist to disable blur for broken drivers. Feel free to attach your driver information to the duplicate bug, so that this driver can be blacklisted in the next version. Please note, that no application is able to crash the X server - this would be a serious security problem if it were possible. As you mention that X is crashing, it indicates that your used driver is very buggy. I'm sorry to say but there is nothing we can do about it, such issues have to be fixed by the driver developers. *** This bug has been marked as a duplicate of bug 242985 ***