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L137 Linux frame buffer question

Hi,

 

I'm using the Spectrum Digital L137 EVM with the DA830 UI board attached. The kernel (MontaVista) is configured to include fb and DA830/OMAP L137 display support. I'm running X by issuing "startx" as root. All is going fairly well - the Ice WM's taskbar seems to look a little truncated - but I don't want the LCD to blank after 10 minutes as it does. I've tried to running a short program to issue an ioctl command to kill blanking e.g. { ... ret_val = ioctl(fb_handle, FBIOBLANK, 0); ...} but get a return value of EINVAL no matter what.

 

Do I need to tweak the FB source to set blanking interval to 0, or have I (more likely) made a newbie mistake?

 

Thanks