Bug 270308

Version:           4.6 (using KDE 4.6.2) 
OS:                Linux

in kde 4.6.1 I hade such problem:

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.


In kde 4.6.2 it's even worse: any change of konsole's window size hangs (usually) the system. Screen is always blinking when I'm resizing it. My "safe" settings dosn't work anymore.


Reproducible: Always

Steps to Reproduce:
in 4.6.1:
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

in 4.6.2:
any change of konsole's window size hangs the system



My graphics card is NVidia GeForce 8600. Driver: current-270.30