It's been a couple of days since I used Elementary OS and it worked as smooth as possible but then all of a sudden I started having this problem. Whenever I restart or shutdown my notebook, it keeps getting stuck in here where it says:

*Starting LightDM Display Manager
*Stopping Send an event to indicate plymouth is up
[17370.126206] [drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo underrun on pipe A 
[17370.126267] [drm:intel_cpu_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

Here's a picture of the problem:

enter image description here

Thank you for helping me out.

2 Answers 2


The original poster's temporary fix was to restart lightdm via the command line, which would be:
sudo service lightdm restart OR sudo systemctl restart lightdm

You can also try reconfiguring lightdm.


I started to receive same problem. I used oibaf/graphics-drivers ppa.

To fix this i've logged in through grub recovery mode, then purged that ppa

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