Bug 608

Description of problem:
Since 31 of March I can observe weird issue: if I maximize konsole, system totally hangs. Only Magic SysRq are the salvation (saK doesn't work however) ;)

I've made a small investigation and the problem is in OpenGL settings in Desktop Effects (Advanced tab).
If I set:
Scale method: Smooth
OpenGL mode: shared memory
Vsync to yes
Direct rendering to yes

the problem occurs.
It's hard to say which option is the problem as I tried some combinations and once it worked, sometimes it doesn't.
To be sure, that the konsole maximization won't hang the pc, I've set:
Scale method: Crisp
OpenGL mode: Texture from bitmap
Vsync to no
Direct rendering to no

With those options, it's ok, however while konsole maximization, konsole window blinks ominously ;)

The functionality test were disabled in both cases and suspend desktop effects for fullscreen windows were enabled.


ps. above option names were translated from polish so may differ a little.

How reproducible:
Always if I set proper settings and maximize the konsole window

Steps to Reproduce:
1. Set options in systemsettings as descibed above (desktop effects in general tab must be enabled)
2. Logout (it doesn't "work" without logout)
3. open konsole window and maximize it. System will totaly hang


Reproducible: 

Steps to Reproduce: