[Bug 200809] New: lightdm/Xorg freezes on startup everytime

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=200809

            Bug ID: 200809
           Summary: lightdm/Xorg freezes on startup everytime
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.18.0-rc8
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: blocking
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: bucket.size at gmail.com
        Regression: No

Created attachment 277835
  --> https://bugzilla.kernel.org/attachment.cgi?id=277835&action=edit
dmesg when crash/freeze occurred

updated from stock 4.15 kernel to 4.18-rc8.
lightdm freezes on boot without boot param `nomodeset` everytime.
graphical startup is proper with boot param `nomodeset`.
not passing amdgpu.dc=1 as it has no effect.

-- system --
kernel: 4.18-rc8 from https://github.com/M-Bab/linux-kernel-amdgpu-binaries
cpu: AMD Ryzen 3 2200G with Radeon Vega Graphics
mainboard: Gigabyte Technology Co., Ltd. A320M-S2H/A320M-S2H-CF, BIOS F22
03/15/2018

-- dmesg log summary --
multiple stack traces, varying everytime, with common line as:
> [    3.197767] [drm:construct [amdgpu]] *ERROR* construct: Invalid Connector
> ObjectID from Adapter Service for connector index:2! type 0 expected 3

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