Oliver Leitner, couple of follow up questions:
1) Did this problem not occur in a release prior to Xenial?
2) Does this continue if you remove all of the non-default kernel parameters 
presently being used:
acpi_os_name=Microsoft Windows NT" acpi_sci=low agp=off consoleblank=0 
enable_mtrr_cleanup enable_timer_pin_1 iomem=relaxed intel_iommu=on 
kvm-intel.nested=1 memory_corruption_check=0 no_timer_check 
pci=routeirq,skip_isa_align,pcie_bus_peer2peer,realloc,pcie_scan_all 
reset_devices rootwait i915.enable_execlists=0 i915.enable_rc6=0 
i915.enable_fbc=0 i915.modeset=1 i915.fastboot=0 i915.semaphores=1 
i915.lvds_channel_mode=1 i915.preliminary_hw_support=1 i915.nuclear_pageflip=1 
i915.enable_guc_submission=1 drm.vblankoffdelay=1 intel_idle.max_cstate=6

** Changed in: linux (Ubuntu)
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1583817

Title:
  WARNING: CPU: 1 PID: 865 at
  /home/kernel/COD/linux/drivers/gpu/drm/drm_irq.c:1326
  drm_wait_one_vblank+0x1b0/0x1c0 [drm]

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