Notes and some more detail for this bug/patch:

The bug is from/caused by 4.12 DRM architecture,  the main line  commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v4.15-rc3&id=ea642c3216cb2a60d1c0e760ae47ee85c9c16447

It will cause x-window start hanged, the detail bug are
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1698700

The fix path link are here: https://lists.freedesktop.org/archives/dri-
devel/2017-November/159002.html

This patch only change Huawei driver, it will not affect any other
vendors.

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https://bugs.launchpad.net/bugs/1738334

Title:
  hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add
  io_mem_pfn callback")

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  ea642c3216cb ("drm/ttm: add io_mem_pfn callback") is incomplete: the
  hisilicon hibmc driver does not contain the callback and so X does not
  start.

  Discussion and potential fix at https://lists.freedesktop.org/archives
  /dri-devel/2017-November/159002.html

  This affects Artful, upstream has not landed on a solution yet as far
  as I can tell, so lets backport the first proposed small fix.

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