[Bug 108747] New: The booting is too long with drm_atomic_helper_wait_for_dependencies errors (xenial+hwe,bionic))

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108747

            Bug ID: 108747
           Summary: The booting is too long with
                    drm_atomic_helper_wait_for_dependencies errors
                    (xenial+hwe,bionic))
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mihailov-d-v at mail.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

The booting is too long on any kernels =>4.4 (higher than Ubuntu xenial non-hwe
versions).

The errors in dmesg output are similar to this:

[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR*
[CRTC:41:pipe B] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR*
[PLANE:35:plane B] flip_done timed out

I tried amd64 and i386 (i686) architectures with the same results. Also I tried
Fedora and some other distributions.
The system information was collected by apport and posted there:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1785326

Thank you.

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