[ts-7000] Panel Touch Screen : TS-TPC-8390 (TS4800) alway fade to blank screen.

["iPAS" <>]

I'm trying a latest image for SD card :
ftp://ftp.embeddedarm.com/ts-socket-macrocontrollers/ts-4800-linux/binaries/ts-images/2gbsd-may052011-interim-squeeze.dd.gz
 .

For playing back movie (mplayer) on touchscreen panel via DirectFB,
I have installed all necessary lib of DirectFB and played .mpg file with this 
command :
mplayer -vo fbdev -loop 0 -framedrop -fs video.mpg
And it work as silk.

But if I stopped playing for while, the screen will be fade to white then black.
Although, I run mplayer again but nothing would be shown.

How could I alway turn-on this lcd touch screen panel ?

ps.
I changed /etc/kbd/config :
POWER_DOWNTIME 0
ÔBLANK_DOWNTIME 0
But it still when to blank.




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