Comment 13 for bug 628930

Proposed release note:

In many cases desktop effects are not active by default or on login in Kubuntu even for systems with video systems that support the current default effects well. These can be manually enabled in SystemSettings -> Desktop Effects, but in order to continue to have effects enabled on login, it is necessary to disable hardware checks in the advanced tab of desktop effect settings. Before bypassing these check, do verify that your system is working correctly with effects enabled.