[gm45] console freezes when attempting to start second instance of Xserver with UXA enabled

Binary package hint: xserver-xorg-video-intel

If UXA is enabled and I attempt to start the second instance of X server (for example by choosing 'switch user' option in logout menu). The console freezes (monitor is black and pressing all sorts of combinations like ctrl+alt+F<1-7>, ctrl+alt+del doesn't have any effect). I'm however still able to ssh to the machine.
I'm attaching Xserver log from the second instance: it says "Failed to initialize kernel memory manager" at the end.

When UXA is not enabled everything works fine.
These probably means there are two problems here:
first, it would be cool if I could have to instances of X with UXA,
second, even if it's not possible to start second instance with UXA the console should not be freezed.

Cheers

  Morg

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
Package: xserver-xorg-video-intel 2:2.6.3-0ubuntu9.2
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersion: Linux version 2.6.28-12-generic (buildd@crested) (gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) ) #43-Ubuntu SMP Fri May 1 19:31:32 UTC 2009
SourcePackage: xserver-xorg-video-intel
Uname: Linux 2.6.28-12-generic x86_64

[lspci]
00:00.0 Host bridge [0600]: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub [8086:2a40] (rev 07)
     Subsystem: Lenovo Device [17aa:20e0]
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller [8086:2a42] (rev 07)
     Subsystem: Lenovo Device [17aa:20e4]