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/lib/udev/rules.d/40-xserver-xorg-video-intel.rules is in xserver-xorg-video-intel 2:2.17.0-1ubuntu4.

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# do not edit this file, it will be overwritten on update

# Jesse Barnes on ubuntu-devel@lists.ubuntu.com:
#   You'll get three events, one when the error is detected, one before the
#   reset and one after.  Each has a different environment variable set; the
#   initial error has ERROR=1, the pre-reset event has RESET=1 and the
#   post-reset event has ERROR=0.

# Disable freeze hook.
SUBSYSTEM=="drm", ACTION=="change", ENV{ERROR}=="1", RUN+="/usr/share/apport/apport-gpu-error-intel.py"