int xxxfb_blank (int blank_mode, const struct fb_info * info);
Blank the screen if blank_mode != 0, else unblank. Return 0 if blanking succeeded, != 0 if un-/blanking failed due to e.g. a video mode which doesn't support it. Implements VESA suspend and powerdown modes on hardware that supports disabling hsync/vsync: blank_mode == 2: suspend vsync blank_mode == 3: suspend hsync blank_mode == 4: powerdown
Returns negative errno on error, or zero on success.