[Bug 112145] New: System hangs on shutdown when using drm.edid kernel parameter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112145

            Bug ID: 112145
           Summary: System hangs on shutdown when using drm.edid kernel
                    parameter
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: njkkow at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145831
  --> https://bugs.freedesktop.org/attachment.cgi?id=145831&action=edit
dmesg log drm.debug=0xe

I am experiencing an issue where my system hangs instead of properly shutting
down when my laptop is docked.  One of my monitors has EDID issues, so I have
to force an EDID using drm.edid.  I noticed that when I remove the parameter, I
have no issues shutting down.  This issue occurs on the current drm-tip kernel
(compiled as of commit e2561817d912857cdf7437e73a8fb41256d06edb.)  I believe
this may be a regression as I do not remember it happening before, but I will
need to do more digging to find a previous kernel version that works.

Thinkpad X270 i7-7500U
UEFI version: R0IET58W (1.36)

How often: always

Steps to reproduce:

-Boot up laptop and login
-Close lid and put it on the dock
-Shutdown with the laptop still on the dock

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