the file is the grub configuration file:

/etc/default/grub

edit it with for example: "sudo gedit /etc/default/grub"
and add the option "acpi=off" into already existing 
GRUB_CMDLINE_LINUX_DEFAULT=""
save the file!!!

after that update the grub for the changes to take efekt
run: "sudo update-grub"

and see 4 URself

:D
thumbs up!

-- 
MASTER: [i855] GPU lockup (apport-crash)
https://bugs.launchpad.net/bugs/541511
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xf86-video-intel.

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