drm/i915: Resetting chip after gpu hang

Please do as root:

EDIT /etc/default/grub
Find the line that starts with GRUB_CMDLINE_LINUX and append i915.enable_rc6=0, giving you for example: GRUB_CMDLINE_LINUX="splash quiet i915.enable_rc6=0"
EXECUTE: update-grub
REBOOT
(optional step) EXECUTE systool -m i915 -av | grep enable_rc6 to check whether you have set this option correctly

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