kwin (KDE4) consumes 99% of CPU

Thank you for reporting this bug. Did you something special after that you have this situation or directly after kde4 startup?

Oh, sorry, I forgot to mention that I had enabled the desktop effects (without effects, kwin works normally).
With desktop effects, it happens directly after kde4 start-up.

Thanks for your response. What graphic hardware do you use? Which driver do you use?

I have a nVidia GeForce 7150M and I'm using the proprietary driver.

$ apt-cache policy nvidia-glx-new
nvidia-glx-new:
  Installed: 169.12+2.6.24.13-19.45
  Candidate: 169.12+2.6.24.13-19.45
  Version table:
 *** 169.12+2.6.24.13-19.45 0
        500 http://sft.if.usp.br hardy-updates/restricted Packages
        500 http://sft.if.usp.br hardy-security/restricted Packages
        100 /var/lib/dpkg/status
     169.12+2.6.24.12-16.34 0
        500 http://sft.if.usp.br hardy/restricted Packages

Please, tell me if you need any more info. This computer is a notebook HP Pavilion dv2745se (Turion64 X2, 3Gb RAM, nVidia graphic card).

I think this is a known problem with the nvidia-driver. Please look at
http://techbase.kde.org/User:Lemma/GPU-Performance
if you can get a little help here.

> I think this is a known problem with the nvidia-driver. Please look at
> http://techbase.kde.org/User:Lemma/GPU-Performance
> if you can get a little help here.

I added all the options they recommend, but this issue still there,
kwin continues consuming a lot of CPU. I will try using nv driver.

>> I think this is a known problem with the nvidia-driver. Please look at
>> http://techbase.kde.org/User:Lemma/GPU-Performance
>> if you can get a little help here.
>
> I added all the options they recommend, but this issue still there,
> kwin continues consuming a lot of CPU. I will try using nv driver.
>

I re-read it carefully, and followed all the tips there, and I got
much better results.
Thanks!

Because this is a performance problem with the nvidia driver and no real bug, i mark this as invalid. Thank you again for taking the time to report this bug and helping to make Ubuntu better. Feel free to submit any future bugs you may find.