Hi!

Mgraesslin told me to post my problem here.

After the update to Kubuntu Precise Pangolin I had a high CPU usage so that my PC was unusable.
After googling I deactivated the minimizing animations and als activated VSync, but this does not help. Only if I deactivate all effects by Control+Shift+F12 I can use KDE again.

glxgears are not rotating fluently. After some hints from mgraesslin I put the debug information of glxinfo onto the forum and he thinks that the last line is interesting, but cannot help me.

Any hints? ( Original german post: http://forum.ubuntuusers.de/topic/kwin- ... ardtipps-/ )

gregor@poppei:~$ kwin --replace &
[1] 3227
gregor@poppei:~$ QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.

Code: Select all

gregor@poppei:~$ OpenGL vendor string:                   NVIDIA Corporation
OpenGL renderer string:                 GeForce 6150SE nForce 430/integrated/SSE2/3DNOW!
OpenGL version string:                  2.1.2 NVIDIA 295.40
OpenGL shading language version string: 1.20 NVIDIA via Cg compiler
Driver:                                 NVIDIA
Driver version:                         295.40
GPU class:                              Unknown
OpenGL version:                         2.1.2
GLSL version:                           1.20
X server version:                       1.11.3
Linux kernel version:                   3.2
Direct rendering:                       yes
Requires strict binding:                no
GLSL shaders:                           yes
Texture NPOT support:                   yes
NO VSYNC! glXWaitVideoSync(1,0,&uint) isn't 0 but 5

Thanks!

Sysconfig: NVIDIA Driver Version: 295.40; graphics card: GeForce 6150SE nForce 430 (GPU 0); Linux 3.2.0-24-generic; KDE 4.8.2

"kcmshell4 kwincompositing", 3rd tab, disable opengl 2.0 shaders (cause is likely lanczos or blurring and rather theoretic fragment shaders in this "gpu"

(it has ONE vertex and holymoly TWO fragment shaders...)

Don't use 295.40 Nvidia driver. It's buggy and pending a fix release. I held the drivers from updating to it on Debian testing.

On the subj, see:

http://forums.debian.net/viewtopic.php?f=6&t=78532
http://techpatterns.com/forums/about2047.html
http://www.nvnews.net/vbulletin/showthr ... ost2546510
http://www.phoronix.com/scan.php?page=n ... px=MTA4ODc

In general, always wait for some time after the new Nvidia driver is released before updating to it. Watch out for regressions mentioned around. And if it's buggy - find ways to avoid using the buggy version until it's fixed.

It wasn't smart for Ubuntu to ship a buggy driver by default. I'm more familiar with managing Nvidia driver on Debian. You can consult Ubuntu community what's the best way to downgrade the driver to 295.33 until the fixed version will come out.

shmerl wrote:You can consult Ubuntu community what's the best way to downgrade the driver to 295.33 until the fixed version will come out.

Thanks fpr your replies!

I tried to downgrade but wasn't successfull. Maybe I did something wrong, I haven't discovered it yet in detail. (http://forum.ubuntuusers.de/post/4332607/)

Meanwhile I switched to XRender until new driver will be shipped. This way I am able to use active corners at least.

Thanks!