Failed to open /sys/class/display_control/omap_disp_control/ch0_output for reading

Hi, everyone!

I use boot files all come from Beagleboard,linux kernel version is
2.6.22.18.

when booting, the LCD can display the Beagleboard logo! but printing
follow errors:
Error: Only video output channel0 (digital) supported, forcing
Error: Failed to open /sys/class/display_control/omap_disp_control/
ch0_output for reading
Error: Failed to create display device instance

when I run DVSDK Demo such as decoder, the LCD is can't display!

the terminal aslo prints follow information:
Error: Only video output channel0 (digital) supported, forcing
Error: Failed to open /sys/class/display_control/omap_disp_control/
ch0_output for reading
Error: Failed to create display device instance
can anyone give me suggestions for that?
Because kernel 2.6.22.18 is compatible with DVSDK, if I develop multi-
media player on beagleboard, have I other better choice?

Thanks a lot!