X crash by xrandr or Screen-Resolution applet

[wilbur]

<HW Environment: menlow>
<SW Environment: hildon-desktop-2.0.11-1~svn15367-0ubuntu4, libhildondesktop:2.0.11 libhildondesktopwm:2.0.11, libhildon-1-0:2.0.1>

Steps to Reproduce:
1) $ xrandr --out LVDS0 --mode 800x600 (cause an immediately x crash)
or
2) Screen-Resolution applet --> Rotation --> inverted (screen is inverted for a short while and then x crash)

Expected result:
resolution changed or Screen appears rotated 180 degrees

Actual result:
X crashes and restarts

P.S.: a similar bug on different platform(https://bugs.launchpad.net/ubuntu-mobile/+bug/227329)