Line 3039 in the source can also cause the message:

                        if (flip_sync == FLIP_ASYNC) {
                                if (!drmmode_wait_vblank(crtc,
                                                         DRM_VBLANK_RELATIVE |
                                                         0, drm_queue_seq,
                                                         NULL, NULL))
                                        goto flip_error;
                                goto next;

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which is subscribed to xserver-xorg-video-ati-hwe-16.04 in Ubuntu.

  Blank screen with only mouse pointer after mesa driver update; display
  does not switch to tty7 upon lightdm start; Xorg.0.log quickly grows

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