[Bug 111087] SteamOS fails to boot with "drmmode_do_crtc_dpms cannot get last vblank counter"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111087

            Bug ID: 111087
           Summary: SteamOS fails to boot with "drmmode_do_crtc_dpms
                    cannot get last vblank counter"
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: ludovico.denittis at collabora.com

Created attachment 144719
  --> https://bugs.freedesktop.org/attachment.cgi?id=144719&action=edit
basic configuration details

When I try to boot SteamOS I end up with just a black screen.

Xorg.0.log contains this error but I'm not completely sure if it is the cause:
(EE) AMDGPU(0): drmmode_do_crtc_dpms cannot get last vblank counter

I also tried installing debian kernel 5.0.2-1~exp1, mesa 19.1.1 and all the
relevant xserver-xorg-video-* 19.0.1 but the problem persisted.

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