[Bug 1780076] Re: 18.04 login screen is skewed/distorted (incorrect stride) when using hibmc_drm graphics

[Bin Li]

** Patch added: "0002-debian-gdm3.install.patch"
   https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1780076/+attachment/5188322/+files/0002-debian-gdm3.install.patch

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Title:
  18.04 login screen is skewed/distorted (incorrect stride) when using
  hibmc_drm graphics

Status in gdm3 package in Ubuntu:
  Fix Released
Status in mutter package in Ubuntu:
  Won't Fix

Bug description:
  [Impact]

   * The login screen is blur, with Huawei's Hi1710 chipset. And below
  is the hardware information.

  05:00.0 VGA compatible controller [0300]: Huawei Technologies Co.,
  Ltd. Hi1710 [iBMC Intelligent Management system chip w/VGA support]
  [19e5:1711] (rev 01)

   * It's really big effect for our customer when they use the arm
  server. It's an hardware specific issue, and I've debugged with the
  mutter for a while  upstream's help, but no luck. And the workaround
  patches was accepted by upstream and now in 18.10.

  
  [Test Case]

   * It's an hardware specific issue, installed the 18.04 on Huawei's
  Hi1710 arm server. After boot up, you will found the login screen is
  distorted.

  
  [Regression Potential] 

   * It's just a kind of workaround, we add one the udev rule to skip
  Huawei's chipset,  which won't affects other platform.

  [Other Info]
   
   * Upstream: https://gitlab.gnome.org/GNOME/mutter/issues/219

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