fifo underflow (with rotate=3)

root@beagleboard:/sys/class/graphics/fb0# cat overlays
0
root@beagleboard:/sys/class/graphics/fb1# cat overlays
1
root@beagleboard:/sys/devices/platform/omapdss/overlay0# cat name
gfx
root@beagleboard:/sys/devices/platform/omapdss/overlay1# cat name
vid1
root@beagleboard:~# cat /dev/urandom > /dev/fb1
cat: write error: No space left on device
root@beagleboard:~# ^C
root@beagleboard:~# cd $ovl1
root@beagleboard:/sys/devices/platform/omapdss/overlay1# cat enabled
0
root@beagleboard:/sys/devices/platform/omapdss/overlay1# echo 1 > enabled

// fb0 is used for the console, fb1 overlays now fb0 and shows random stuff

root@beagleboard:/sys/devices/platform/omapdss/overlay1#

// I press "Enter" on the attached keyboard several times.
// This updates the fb0 which is currently in the background
// Then this happens after a few hits:

[ 1529.813354] omapdss DISPC error: FIFO UNDERFLOW on gfx, disabling the overlay
[ 1529.883117] omapdss DISPC error: FIFO UNDERFLOW on vid1, disabling the overlay