kernel: [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [CRTC:37:crtc-0] flip_done timed out

 Problem

The following error messages are logged in messages file while the server is running:

 Solution

Currently this bug has been reported and has no solution. This is a workaround that has been tested on Ubuntu 20.x:

1. Edit the file: /etc/default/grub and the following text:

   modprobe.blacklist=vmwgfx

   
   file: /etc/default/grub

   .. GRUB_CMDLINE_LINUX_DEFAULT="maybe-ubiquity ipv6.disable=1 modprobe.blacklist=vmwgfx" ...

    

2. Update grub

   sudo update-grub

    

3. Reboot the server

   sudo reboot

    

4. Log in and verify the error is no longer in the error logs:

   sudo journalctl -p err -b

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