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[Nizamov Shawkat <nizamov.shawkat@xxxxxxxxx>]

I also experience the same bug on notebook with i945 chipset with Ubuntu Jaunty.
Symptoms are the same - at some point system becomes irresponsive, disk activity is such high that the only option is to power-off the notebook. 

As I was experiencing it rather frequently I had open consoles with
dstat, htop and atop running. dstat show that activity is completely
"read", not "write". htop shows load average near to  25/18/8 with lot
of processed in "D" state (waiting for IO, AFAIK). Memory is about 500
Mb consumed (+1Gb cache) of 1.5 Gb total. Atop show me that there were
*several* programs fighting to read the disk - the most prominent was
okular (actually right in this case bug was triggered by fast listing
the 400 page 2Mb pdf), but firefox, thunderbird and X were also having a
high read activity!

After killing okular (took a minute to quit from htop to bash) normal
desktop responsivenes returned.  But bug is *not* in okular - different
times different programs trigger this behaviour.

My systems is jaunty, i386 arch. The behaviour is the same with kde4.2.2 and kde4.2.3 (installed from kubuntu-experimental ppa). I upgraded the xserver-xorg-video-intel from xorg-edgers ppa - still the same. And I did not not touch the xorg - right now it is UXA, see the attached xorg.log. 
I don't know the default for pure jaunty. 

PS now i know for sure - it is not a beagle to blame, as i expected

** Attachment added: "Xorg.0.log"
   http://launchpadlibrarian.net/27007852/Xorg.0.log

-- 
High load average, disk read, no apparent reason - 2.6.28-11
https://bugs.launchpad.net/bugs/367377
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