whith nvidia cards plasma desktop is unusable freeze time at time

[BasaBuru]

Hello:

I have a big problem whith the plasma desktop, it is freeze time at time (at 
50 secons and 1 minute frozen) and is unusable.

I'm try whith several nvidia drivers stable and beta. And nothing the problem 
is same.

I have a GTS 250 in weezy whith 2.6.38.2 kernel

I'm try whith a xorg.conf and whithout 

My xorg.conf:

# 27-03-2011 BasaBuru

  Section "Extensions"
      Option         "Composite" "Enable"
  EndSection


  Section "Device"
      Identifier     "Nvidia0"
      Driver         "nvidia"
      VendorName     "NVIDIA Corporation"
      BoardName      "GTS 250"
      Option 	     "NoLogo" "true"
      Option         "UseEdidDpi" "DFP-0"
      Option         "UseEdidFreqs" "True"
      Option         "TripleBuffer" "true"
      Option	     "UseEvents" "true"
      Option 	     "AddARGBGLXVisuals" "true"
      Option         "EnableACPIHotkeys" "true"
      Option         "AllowUnofficialGLXProtocol" "true"
      Screen          0  


EndSection

  Section "Monitor"
      Identifier     "Monitor0"
      VendorName     "Samsung"
      ModelName      "SyncMaster T240"
      Option         "DPMS" "true"
  EndSection


  Section "Screen"
      Identifier     "Screen0"
      Device         "Nvidia0"
      Monitor        "Monitor0"
      DefaultDepth 24
      Option         "metamodes" "DFP: nvidia-auto-select +0+0"
  EndSection


I'm try whith the nouveau driver and more bad in 30 secons frozen the plasma 
desktop for 2 or 3 minutes.

I think the problem is a kwin afair, but i'dont now.

Do you now how solution this???

thanks

BasaBuru
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