Comment 40 for bug 1726548

add some data with drm.debug=0x02, unplug/replug event on the display port:

sudo dmesg -W
[ 100.778637] msm_dpu ae01000.display-controller: [drm] Cannot find any crtc or sizes
[ 107.863951] [drm:msm_fbdev_create [msm]] create fbdev: 640x480@32 (640x480)
[ 107.864074] [drm:msm_alloc_stolen_fb [msm]] allocating 1228800 bytes for fb 0
[ 107.864583] [drm:msm_fbdev_create [msm]] fbi=0000000043985575, dev=00000000597e5822
[ 107.864631] [drm:msm_fbdev_create [msm]] par=00000000c01b95f8, 640x480
[ 107.864651] [drm:msm_fbdev_create [msm]] allocated 640x480 fb
[ 107.865595] Console: switching to colour frame buffer device 80x30
[ 107.865616] msm_dpu ae01000.display-controller: [drm] fb0: msmdrmfb frame buffer device

It looks like the first event (cannot find crtc data) is the culprit in my case.