I've managed to get the newest packages running and still being able to
use the computer. I have the following results:

A: NoDRI set in /etc/X11/xorg.conf
B: NoDRI _not_ set in /etc/X11/xorg.conf
1: [Compositing] -> Enabled=true in .kde/share/config/kwinrc
2: 1: [Compositing] -> Enabled=false in .kde/share/config/kwinrc

A1: black windows on black background, some veeeeeeery faint shadows, mouse 
cursor is ok
A2: ok
B1: crash, see attached file - libgl1-mesa-dri-dbgsym instead of 
libgl1-mesa-dri-dbg
B2: ok

Procedure for attached file:

1.) made sure that /etc/X11/core does _not_ exist
2.) NoDRI _not_ set
3.) Compositing enabled
4.) made sure 
--- cut here ---
Section "ServerFlags"
        Option "NoTrapSignals" "true"
EndSection
--- cut here ---
is in /etc/X11/xorg.conf
5.) made sure
--- cut here ---
enabled=0
--- cut here ---
is in /etc/default/apport
6.) made sure
--- cut here ---
deb http://ddebs.ubuntu.com hardy main universe
--- cut here ---
is in /etc/apt/sources.list
7.) sudo apt-get install xserver-xorg-core-dbg xserver-xorg-video-intel-dbg 
xserver-xorg-dbgsym libc6-dbg libgl1-mesa-dri-dbgsym
8.) rebooted
9.) Alt-F1, login, sudo su -, ulimit -c unlimited, /etc/init.d/kdm restart
10.) Login as user -> crash
11.) Reboot, sudo su, gdb /usr/bin/Xorg /etc/X11/core 2>&1 | tee 
/tmp/gdb-Xorg.txt
12.) Reversed all above changes

Hope it helps.

** Attachment added: "gdb-Xorg.txt"
   http://launchpadlibrarian.net/18613363/gdb-Xorg.txt

-- 
[Intrepid] Intel graphics card only runs with NoDRI option
https://bugs.launchpad.net/bugs/277709
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