Created attachment 26893 [details]
xorg log file

I am using kubuntu with X related packages from xorg-edgers PPA which has everything from git.

I faced this issue even before but it was fixed, but now a few days back there was some update to xerver-xorg-video-intel package which broke this behaviour and on kde 4 logout it crashes. ( Previously it used to freeze entirely and was not even able to do VT switch, now I can do VT switch and restart kdm).

The package versions I use is 
xserver-xorg-video-intel - 2:2.7.99.901+git20090617.b5cd2130-0ubuntu0sarvatt~jaunty

kernel 2.6.30

I can see these in my Xorg.0.log

(II) Open ACPI successful (/var/run/acpid.socket)
(II) APM registered successfully
(II) intel(0): [DRI2] Setup complete
(**) intel(0): Framebuffer compression disabled
(**) intel(0): Tiling enabled
(==) intel(0): VideoRam: 262144 KB
(II) intel(0): Attempting memory allocation with tiled buffers.

Backtrace:
0: /usr/bin/X(xorg_backtrace+0x3b) [0x81353ab]
1: /usr/bin/X(xf86SigHandler+0x55) [0x80c74e5]
2: [0xb7f63400]
3: /usr/lib/xorg/modules/drivers//intel_drv.so(i830_allocate_memory+0x2f6) [0xb7937816]
4: /usr/lib/xorg/modules/drivers//intel_drv.so(i830_allocate_2d_memory+0xbf) [0xb793830f]
5: /usr/lib/xorg/modules/drivers//intel_drv.so [0xb792c764]
6: /usr/lib/xorg/modules/drivers//intel_drv.so [0xb79316c0]
7: /usr/bin/X(AddScreen+0x19d) [0x8071b0d]
8: /usr/bin/X(InitOutput+0x206) [0x80afc86]
9: /usr/bin/X(main+0x1e1) [0x8072201]
10: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7c52775]
11: /usr/bin/X [0x8071891]
Saw signal 11.  Server aborting.
 ddxSigGiveUp: Closing log