Below is the result of executing the ddcutil capabilities command for a Dell U3011 monitor that ddcutil has identified as display number 4.

$ ddcutil capabilities --display 4 --verbose

Output level:               Verbose
Reporting DDC data errors:  false
Trace groups active:        none

Unparsed capabilities string: (prot(monitor)type(lcd)model(U3011)cmds(01 02 03 07 0C E3 F3)vcp(02 04 05 06 08 10 12 14(01 05 08 0B 0C) 16 18 1A 52 60(01 03 04 0C 0F 11 12) AC AE B2 B6 C6 C8 C9 D6(01 04 05) DC(00 02 03 04 05) DF FD)mccs_ver(2.1)mswhql(1))
MCCS version: 2.1
Commands:
  Command: 01 (VCP Request)
  Command: 02 (VCP Response)
  Command: 03 (VCP Set)
  Command: 07 (Timing Request)
  Command: 0c (Save Settings)
  Command: e3 (Capabilities Reply)ls 
  Command: f3 (Capabilities Request)
VCP Features:
  Feature: 02 (New control value)
  Feature: 04 (Restore factory defaults)
  Feature: 05 (Restore factory brightness/contrast defaults)
  Feature: 06 (Restore factory geometry defaults)
  Feature: 08 (Restore color defaults)
  Feature: 10 (Brightness)
  Feature: 12 (Contrast)
  Feature: 14 (Select color preset)
    Values (unparsed): 01 05 08 0B 0C
    Values (  parsed):
       01: sRGB
       05: 6500 K
       08: 9300 K
       0b: User 1
       0c: User 2
  Feature: 16 (Video gain: Red)
  Feature: 18 (Video gain: Green)
  Feature: 1A (Video gain: Blue)
  Feature: 52 (Active control)
  Feature: 60 (Input Source)
    Values (unparsed): 01 03 04 0C 0F 11 12
    Values (  parsed):
       01: VGA-1
       03: DVI-1
       04: DVI-2
       0c: Component video (YPrPb/YCrCb) 1
       0f: DisplayPort-1
       11: HDMI-1
       12: HDMI-2
  Feature: AC (Horizontal frequency)
  Feature: AE (Vertical frequency)
  Feature: B2 (Flat panel sub-pixel layout)
  Feature: B6 (Display technology type)
  Feature: C6 (Application enable key)
  Feature: C8 (Display controller type)
  Feature: C9 (Display firmware level)
  Feature: D6 (Power mode)
    Values (unparsed): 01 04 05
    Values (  parsed):
       01: DPM: On,  DPMS: Off
       04: DPM: Off, DPMS: Off
       05: Write only value to turn off display
  Feature: DC (Display Mode)
    Values (unparsed): 00 02 03 04 05
    Values (  parsed):
       00: Standard/Default mode
       02: Mixed
       03: Movie
       04: User defined
       05: Games
  Feature: DF (VCP Version)
  Feature: FD (manufacturer specific feature)