Int 10 Fn 4F10  - Vesa Vbe/pm (power Management) V1.0+ - Get Capabilities  [p]

   AX = 4F10h
   BL = 00h
   ES:DI = 0000h:0000h (reserved for future use as pointer to info block)

Return: AL = 4Fh if function supported (installed)
   AH = call status
       00h successful
       else failed
   ---if successful---
   BL = VBE/PM version (bits 7-4: major, bits 3-0: minor)
   BH = supported states (see #0087)
   ES:DI unchanged
Index: installation check;VESA VBE/Power Management|VESA DPMS

See Also: AX=4F10h/BL=01h,AX=4F10h/BL=02h

Bitfields for VESA VBE/PM supported power states:
Bit(s) Description (Table 0087)
 0 standby
 1 suspend
 2 off
 3 reduced on