Line 3039 in the source can also cause the message:
if (flip_sync == FLIP_ASYNC) {
if (!drmmode_wait_vblank(crtc,
DRM_VBLANK_RELATIVE |
DRM_VBLANK_EVENT,
0, drm_queue_seq,
NULL, NULL))
goto flip_error;
goto next;
}
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https://bugs.launchpad.net/bugs/1750393
Title:
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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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati-hwe-16.04/+bug/1750393/+subscriptions
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