Comment 89 for bug 447892

(In reply to comment #9)
> Some updated information from downstream:
> - The kernel parameter acpi=off stops the freezes. I don't know exactly what is
> turned off with this. At least it turns off KMS, so kalessin had to revert to
> the karmic -intel driver whick has UMS support to test this.
> - The kernel parameter nomodeset still produces freezes, so the fact that it
> stops with acpi=off is not due to using UMS instead of KMS.

I have similar problem on FreeBSD 8 with xf86-video-intel-2.7.1 on an atom based machine with "<Intel 82945G (945G GMCH) SVGA controller>"

Machine description (in french) http://www.ldlc.com/fiche/PB00089880.html

Symptom : Freeze for 2/3 mn at
  - xdm start
  - session start
  - graphic output using shm

Tried :
  - use vesa mode : it works but I can't use the 1910x1080 resolution : unusable
  - downgrade xf86-video-intel to 2.6 branch : same symptom
  - disable shm with
 Section "Extensions"
      Option "MIT-SHM" "Disable"
 EndSection
 in /etc/X11/xorg.conf : same symptom
  - disable acpi (hint.acpi.0.disabled="1" in /boot/loader.conf) : it works but I can't use the multi thread capability of my Atom230 which is a pity on this machine.