Xorg 1.10.1 consumes a lot of CPU (up to 100% CPU when switching between windows, starting and closing applications). I have got a Lenovo Thinkpad T61 with Kubuntu 11.04 64bit, NVIDIA Quadro NVS140M and the NVIDIA driver 270.41.06. I have had the same problem with Kubuntu 10.10 and NVIDIA driver 260.19.06). Any ideas how to fix this?

Thanks
Oliver

does turning off the blur effect help?

I assume when desktop effects are disabled the problem does not happen?

if you create a new user and login as that user does this happen?

Hello,
desktop effects are turned off completely. If they were turned on things would be even worse.

Regards,
Oliver

seems you are not alone http://www.google.com/search?q=NVS140M+ ... 2&bih=1011

you can try this (using raster graphics) http://blogs.fsfe.org/micuintus/2010/09 ... ng-engine/ & http://apachelog.wordpress.com/2010/09/ ... ystem-kcm/

o

other things to try:

1) compile Nvidia drivers from source https://help.ubuntu.com/community/NvidiaManual
2) try Nouveau driver instead
3) make sure you're using Nvidia driver that matches your kernel (would think this was automatice but .........)
4) try older versions of the Nvidia driver if available in repo (especially 169.x series)

The following solved the problem for me:
I am using an Nvidia card and I used the nvidia-settings to save the xorg.conf. I had to add the following lines for it use the hardware rending in a more efficient manner.

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection

I can confirm that this works perfectly. I'm running Linux Mint 10 KDE on a 2.8 ghz dual core with the 260.x nVidia driver with an 8800 GTX.

With nothing extra running after boot and not actively using the system I was getting an average of 45% cpu usage. Not just one core but both. I added the below section, restarted X and the problem was solved.
Thanks meng!

abadam5167 wrote:The following solved the problem for me:
I am using an Nvidia card and I used the nvidia-settings to save the xorg.conf. I had to add the following lines for it use the hardware rending in a more efficient manner.

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection

abadam5167 wrote:The following solved the problem for me:
I am using an Nvidia card and I used the nvidia-settings to save the xorg.conf. I had to add the following lines for it use the hardware rending in a more efficient manner.

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection

Couple of things:
1. your fix worked, thank you very much!
2. it's a bug noted here:
https://bugs.launchpad.net/ubuntu/+sour ... bug/737454
and here
http://ubuntuforums.org/showthread.php?t=1744316

btw, I'm not using KDE, but Gnome, so it ain't your fault.

Finally I've figure out how to get high performance in KDE on T61. First of all you have to TURN OFF Security Memory option in BIOS and that's all !!!!!!!!!!!! Install Kubuntu 11.10, open konsole, type : "apt-get install nvidia-current". If you got problem with DPI after this : add to you xorg.conf in Device section :

Option "UseEdidDpi" "False"
Option "DPI" "96 x 96"

Reinstalling graphics (via Jockey), or upgrading to higher version helped me.
(I have some quite often updated PPA repositories for my NVIDIA graphics.)

Adding:

export QT_GRAPHICSSYSTEM="raster";

to my ".profile" file has also speeded things up.

LPCs.

Notice that in recent versions of the KDE Workspaces you can select the graphics system to use for KWin directly from System Settings.