*** This bug is a duplicate of bug 1727356 ***
    https://bugs.launchpad.net/bugs/1727356

It sounds like you're referring to:

[   22.774658] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU 
pipe B FIFO underrun
[   23.870619] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU 
pipe B FIFO underrun
[   24.280905] e1000e: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: 
Rx/Tx
[   24.281048] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[   25.216644] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU 
pipe B FIFO underrun
[   26.474633] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU 
pipe B FIFO underrun
[   27.720650] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU 
pipe B FIFO underrun

So this would be a kernel bug. However in my experience such kernel
errors are also not fatal and won't cause permanent graphics problems.

Looking at your CPU model however:
  Core(TM)2 Duo CPU     E8500 
I can tell you are experiencing bug 1727356, which is not related to kernel 
errors at all.

** This bug has been marked a duplicate of bug 1727356
   Wayland sessions (including the login screen itself) don't start up on older 
Intel GPUs (pre-Sandy Bridge)

-- 
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1780077

Title:
  FIFO underrun error

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