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Re: X using up to 100% of cpu while moving windows



Martin Hauser wrote:
Hello,

since a long time i run on debian/unstable on my thinkpad r40, using
Xorg. Recently (the last few days), i recognized unordinary lag in
several applications (including skype) which lead me to closer
investigation. I found out that the X-server (or the specific wm) is
taking a lot of cpu for moving the windows around. I believe that this
shouldn't cross 50% on a recent cpu and i have the feeling i'm just
missing some packet out which would fix the problem for me.

The install of the system is fresh (one day old), so probably the
problem is something recent. The Xorg.conf i'm using is one that has
proven itself since xorg exists in the debian repository, so i doubt it
is the source. Also there is nothing i have changed for a while and i'm
definately sure that this Problem has not existed a while back.

It might be that an upgrade to Xorg broke your hardware acceleration and
now the CPU has to do rendering tasks which were taken care of by the
graphics card earlier. You can check if you have direct rendering
enabled with "glxinfo|grep direct". A number of people have reported
problems with ATI cards and Xorg 6.9 recently (google the archives of
debian-laptop and debian-user), so maybe you will have to downgrade to
Xorg 6.8. If you need more detailed advice you should post your
/etc/X11/xorg.conf and the output of

egrep '^\((WW|EE)\)' /var/log/Xorg.0.log

Regards,
           Florian



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