[Bug 1774789] [NEW] Sddm hangs with a blank cursor

[metaldoctor]

Public bug reported:

This bug happens approximately once or twice a week. My laptop gets switched off every day, and after a cold start in the morning I cannot boot up to sddm login prompt. I just see the mouse cursor, so X seems to be started and cannot go further.
After that I can correctly power my laptop off, or switch to one of the native terminals. During the second power on I'm able to login.
Here - https://imgur.com/P2eltiP is another problem which can happen in a couple of hours of work. It's a blinking distorted artifact frame around a window in focus. It dissapears when I move that window, so it is not that critical.

My .xsession-errors contents:
...
The X11 connection broke: I/O error (code 1)
XIO:  fatal IO error 0 (Success) on X server ":0"
      after 11123 requests (11123 known processed) with 0 events remaining.

$ lsb_release -rd
Description:    Ubuntu 18.04 LTS
Release:        18.04

$ apt-cache policy sddm
sddm:
  Installed: 0.17.0-1ubuntu7

I expected sddm to boot up to login invitation.

I've got just a cursor on a black screen.

$ sudo lspci
00:02.0 VGA compatible controller: Intel Corporation Device 591e (rev 02)

The laptop model is: Xiaomi Mi Notebook Air 12.5" 4/256 GB Silver

** Affects: sddm (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Sddm hangs with a blank cursor

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