OSD shows before the picture fades in

[lnx64]

Has anyone seen anything quite like this?

https://www.youtube.com/watch?v=4nLCLiLmsTc

If I turn the set off and immediately back on, the OSD comes up instantly as expected, but once again, the picture itself remains black for a few seconds before slowly fading in.

I'm assuming the OSD is just sent to the picture tube as instant as the TV starts up, and something is slowly ramping up the brightness to the picture perhaps, in the jungle IC?