[Bug 106933] New: [CHV] On Dell 5855 boot process stuck for three-five minutes on Plymouth->Xorg hand off since Linux 4.17.0rc2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106933

            Bug ID: 106933
           Summary: [CHV] On Dell 5855 boot process stuck for three-five
                    minutes on Plymouth->Xorg hand off since Linux
                    4.17.0rc2
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: russianneuromancer at ya.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 140178
  --> https://bugs.freedesktop.org/attachment.cgi?id=140178&action=edit
debug dmesg

Hello!

With Linux 4.17.0rc2 - Linux 4.17.1 boot process always stuck for three-five
minutes at the stage when gdm3 is ready to start Xorg (cursor appear on the
screen, Plymouth splash disappear, Gnome Shell desktop loads).

With Linux drm-tip (cod/tip/drm-tip/2018-06-16,
02d8db1a894b0e646b2debd64ce24b8e99fd2ffd) couple of times system started
normally, but after that I getting same behaviour as with Linux 4.17.0rc2 -
Linux 4.17.1. 

systemd-analyze:
Startup finished in 7.524s (firmware) + 8.012s (loader) + 7.960s (kernel) +
4min 11.905s (userspace) = 4min 35.403s
graphical.target reached after 4min 9.959s in userspace

systemd-analyze blame:
     4min 4.390s plymouth-quit-wait.service
          2.406s NetworkManager-wait-online.service
          1.510s plymouth-start.service
          1.351s systemd-journal-flush.service
          1.325s dev-mmcblk0p2.device
           822ms networkd-dispatcher.service
           719ms udisks2.service

debug dmesg is attached

Hardware:
Dell Venue 8 Pro tablet with Intel Atom x5-Z8500,
Integrated display is connected via DSI.

Software:
Ubuntu 18.04 with Linux 4.18.0rc2 and newer.
Boot with both of Intel DDX and modesettingd DDX was tested.
X.org Server 1.19.6, Mesa 18.0.0rc5, libdrm 2.4.91

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