pi@NanoPC-T6:~$ gst-launch-1.0 --verbose videotestsrc ! kmssink Jan 02 19:47:16 NanoPC-T6 kernel: [drm:vop2_crtc_atomic_begin] *ERROR* vp1 Cluster6 win0[zpos:1] must next to win1[zpos:8] Jan 02 19:47:16 NanoPC-T6 kernel: Unable to handle kernel NULL pointer dereference at virtual address 0000000000...