Comment 73 for bug 441653

I encountred the trouble in natty today, so I can confirm that it has been fixed for natty.

It prevent the computer to boot, but I can shutdown it pressing the power off (acpi event).
Here is the end of /var/log/Xorg.1.log :
[ 19.465] (II) VESA: driver for VESA chipsets: vesa
[ 19.465] (II) FBDEV: driver for framebuffer: fbdev
[ 19.465] (--) using VT number 1

[ 30.720]
Fatal server error:
[ 30.720] xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call
[ 30.720]
[ 30.720]
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[ 30.720] Please also check the log file at "/var/log/Xorg.1.log" for additional information.
[ 30.720]