CU34P2X - Monitor AOC - Free user manual and instructions

Product Type	Monitor
Brand	AOC
Model	CU34P2X
Screen Size	34 inches
Panel Type	VA (Vertical Alignment)
Curvature	1500R curved
Resolution	3440 x 1440 (UWQHD)
Refresh Rate	100 Hz
Response Time	4 ms (GtG)
Brightness	250 cd/m²
Contrast Ratio	3000:1
Viewing Angles	178° / 178°
Color Support	16.7 million colors
Connectivity	DisplayPort 1.4, 2x HDMI 2.0, USB-C (65W PD), 4x USB 3.2, Audio out
Power Supply	100-240V AC, 50/60Hz
Power Consumption	35 W (typical), 0.5 W (standby)
Dimensions (with stand)	614.3 x 421.6 x 259.3 mm
Weight (with stand)	8.3 kg
VESA Mounting	100 x 100 mm
Main Features	Ultra-wide QHD, USB-C docking, height-adjustable stand, Flicker-Free, Low Blue Light
Maintenance and Cleaning	Use a soft microfiber cloth; avoid spraying liquids directly.
Safety	Use a grounded electrical outlet; avoid covering vents.
Spare Parts and Repairability	Genuine spare parts available via AOC authorized service centers.

Frequently Asked Questions - CU34P2X AOC

What is the native resolution and refresh rate of the AOC CU34P2X?

The AOC CU34P2X features a 3440 x 1440 (UWQHD) resolution with a 100Hz refresh rate, providing a smooth and immersive viewing experience.

Does the USB-C port support charging?

Yes, the USB-C port supports 65W power delivery, allowing you to charge compatible laptops while transferring video and data.

How can I adjust the ergonomics of this monitor?

The stand offers height adjustment, tilt, and swivel functionality, and the monitor supports VESA 100x100mm mounting for flexible placement.

Can I use picture-by-picture or split-screen features?

Yes, the monitor includes Picture-in-Picture (PiP) and Picture-by-Picture (PbP) modes, allowing you to display content from two sources simultaneously.

What eye-care features are included?

It includes Flicker-Free technology and a Low Blue Light mode to reduce eye strain during long sessions.

How do I clean the monitor screen safely?

Use a soft, dry microfibre cloth to wipe the screen. If necessary, lightly dampen the cloth with water. Avoid using harsh chemicals or solvents.

What should I do if the monitor does not turn on?

First, check that the power cable is securely connected to both the monitor and a grounded outlet. Verify the input source is selected correctly, and try a different cable or port. If the issue persists, contact AOC support.

Does the monitor have built-in speakers?

No, the AOC CU34P2X does not include built-in speakers. You can connect audio via the headphone jack or use the USB-C connection for audio.

How do I access the on-screen display (OSD) menu?

Press the joystick button located on the back of the monitor to open the OSD. Navigate with the joystick to adjust brightness, input, and other settings.

Is the monitor compatible with Mac OS and Windows?

Yes, the monitor works with both Windows and macOS systems. Some features, such as Adaptive-Sync, may require specific graphics card support.

USER MANUAL CU34P2X AOC

National Conventions....1

Power 2

Installation....3

Cleaning 4

Other 5

Setup 6

Contents in Box....6

Setup Stand & Base....7

Adjusting Viewing Angle....8

Connecting the Monitor 9

Wall Mounting....10

AMD FreeSync Premium function....11

Hotkeys 12

OSD Setting 13

Luminance 14

Color Setup....15

Picture Boost 16

OSD Setup....17

PIP Setting....18

Game Setting....19

Extra 20

Exit....21

LED Indicator 22

Troubleshoot....23

Specification....24

General Specification....24

Preset Display Modes 25

Pin Assignments....26

Plug and Play 27

Safety

National Conventions

The following subsections describe notational conventions used in this document.

Notes, Cautions, and Warnings

Throughout this guide, blocks of text may be accompanied by an icon and printed in bold type or in italic type. These blocks are notes, cautions, and warnings, and they are used as follows:

NOTE: A NOTE indicates important information that helps you make better use of your computer system.

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.

WARNING: A WARNING indicates the potential for bodily harm and tells you how to avoid the problem. Some warnings may appear in alternate formats and may be unaccompanied by an icon. In such cases, the specific presentation of the warning is mandated by regulatory authority.

Power

The monitor should be operated only from the type of power source indicated on the label. If you are not sure of the type of power supplied to your home, consult your dealer or local power company.

The monitor is equipped with a three-pronged grounded plug, a plug with a third (grounding) pin. This plug will fit only into a grounded power outlet as a safety feature. If your outlet does not accommodate the three-wire plug, have an electrician install the correct outlet, or use an adapter to ground the appliance safely. Do not defeat the safety purpose of the grounded plug.

Unplug the unit during a lightning storm or when it will not be used for long periods of time. This will protect the monitor from damage due to power surges.

Do not overload power strips and extension cords. Overloading can result in fire or electric shock.

To ensure satisfactory operation, use the monitor only with UL listed computers which have appropriate configured receptacles marked between 100-240V AC, Min. 5A.

The wall socket shall be installed near the equipment and shall be easily accessible.

Installation

Do not place the monitor on an unstable cart, stand, tripod, bracket, or table. If the monitor falls, it can injure a person and cause serious damage to this product. Use only a cart, stand, tripod, bracket, or table recommended by the manufacturer or sold with this product. Follow the manufacturer's instructions when installing the product and use mounting accessories recommended by the manufacturer. A product and cart combination should be moved with care.

Never push any object into the slot on the monitor cabinet. It could damage circuit parts causing a fire or electric shock. Never spill liquids on the monitor.

Do not place the front of the product on the floor.

If you mount the monitor on a wall or shelf, use a mounting kit approved by the manufacturer and follow the kit instructions.

Leave some space around the monitor as shown below. Otherwise, air-circulation may be inadequate hence overheating may cause a fire or damage to the monitor.

To avoid potential damage, for example the panel peeling from the bezel, ensure that the monitor does not tilt downward by more than -5 degrees. If the -5 degree downward tilt angle maximum is exceeded, the monitor damage will not be covered under warranty.

See below the recommended ventilation areas around the monitor when the monitor is installed on the wall or on the stand:

Installed with stand

Cleaning

Clean the cabinet regularly with cloth. You can use soft-detergent to wipe out the stain, instead of strong-detergent which will cauterize the product cabinet.

When cleaning, make sure no detergent is leaked into the product. The cleaning cloth should not be too rough as it will scratch the screen surface.

Please disconnect the power cord before cleaning the product.

Other

If the product is emitting a strange smell, sound or smoke, disconnect the power plug IMMEDIATELY and contact a Service Center.

Make sure that the ventilating openings are not blocked by a table or curtain.

Do not engage the LCD monitor in severe vibration or high impact conditions during operation.

Do not knock or drop the monitor during operation or transportation.

The power cords shall be safety approved. For Germany, it shall be H03VV-F, 3G, 0.75 mm2, or better. For other countries, the suitable types shall be used accordingly.

Excessive sound pressure from earphones and headphones can cause hearing loss. Adjustment of the equalizer to maximum increases the earphones and headphones output voltage and therefore the sound pressure level.

Setup

Contents in Box

* Not all signal cables will be provided for all countries and regions. Please check with the local dealer or AOC branch office for confirmation.

Setup Stand & Base

Please setup or remove the base following the steps as below.

Setup:

Remove:

Adjusting Viewing Angle

For optimal viewing it is recommended to look at the full face of the monitor, then adjust the monitor's angle to your own preference.

Hold the stand so you will not topple the monitor when you change the monitor's angle.

You are able to adjust the monitor as below:

NOTE:

Do not touch the LCD screen when you change the angle. It may cause damage or break the LCD screen.

WARNING:

1. To avoid potential screen damage, such as panel peeling, ensure that the monitor does not tilt downward by more than -5 degrees.
2. Do not press the screen while adjusting the angle of the monitor. Grasp only the bezel.

Connecting the Monitor

Cable Connections In Back of Monitor and Computer:

1. USB3.2 Gen1x2
2. USB3.2 Gen1+charging
3. USB3.2 Gen1
4. USB-PC(USB upstream)
5. HDMI1x2
6. DPx2
7. Earphone
8. Power

Connect to PC

1. Connect the power cord to the back of the display firmly.
2. Turn off your computer and unplug its power cable.
3. Connect the display signal cable to the video connector on the back of your computer.
4. Plug the power cord of your computer and your display into a nearby outlet.
5. Turn on your computer and display.
   If your monitor displays an image, installation is complete. If it does not display an image, please refer Troubleshooting. To protect equipment, always turn off the PC and LCD monitor before connecting.

Wall Mounting

Preparing to Install An Optional Wall Mounting Arm.

This monitor can be attached to a wall mounting arm you purchase separately. Disconnect power before this procedure. Follow these steps:

1. Remove the base.
2. Follow the manufacturer's instructions to assemble the wall mounting arm.
3. Place the wall mounting arm onto the back of the monitor. Line up the holes of the arm with the holes in the back of the monitor.
4. Insert the 4 screws into the holes and tighten.
5. Reconnect the cables. Refer to the user's manual that came with the optional wall mounting arm for instructions on attaching it to the wall.

Noted: VESA mounting screw holes are not available for all models, please check with the dealer or official department of AOC.

* Display design may differ from those illustrated.

WARNING:

1. To avoid potential screen damage, such as panel peeling, ensure that the monitor does not tilt downward by more than -5 degrees.
2. Do not press the screen while adjusting the angle of the monitor. Grasp only the bezel.

AMD FreeSync Premium function

1. AMD Freesync premium function is working with DP/HDMI

2. Compatible Graphics Card: Recommend list is as the below, also could be checked by visiting www.AMD.com

3. Radeon™ RX Vega series

4. Radeon™ RX 500 series
5. Radeon™ RX 400 series
6. Radeon™ R9/R7 300 series (R9 370/X, R7 370/X, R7 265 except)
   • Radeon™ Pro Duo (2016)
7. Radeon™ R9 Nano series
8. Radeon™ R9 Fury series
9. Radeon™ R9/R7 200 series (R9 270/X, R9 280/X except))

Hotkeys

1 Source/Exit

2 Game Mode/<

3 Dial Point/>

4 Menu/Enter

5 Power

Power

Press the Power button to turn on the monitor.

Menu/Enter

When there is no OSD, Press to display the OSD or confirm the selection.

Game Mode/<

When there is no OSD, press "<" key to open game mode function, then press "<" or "> " key to select game mode (FPS, RTS, Racing, Gamer 1, Gamer 2 or Gamer 3) basing on the different game types.

Dial Point/>

When there is no OSD, press Dial Point button to show / hide Dial Point.

Source/Exit

When the OSD is closed, press Source/Exit button will be Source hot key function.

When the OSD is closed, press Source/Auto/Exit button continuously about 2 second to do auto configure (Only for the models with D-Sub).

OSD Setting

Basic and simple instruction on the control keys.

1). Press the MENU-button to activate the OSD window.
2). Press< or > to navigate through the functions. Once the desired function is highlighted, press the MENU-button to activate it, press < or > to navigate through the sub-menu functions. Once the desired function is highlighted, press MENU-button to activate it.
3). Press< or > to change the settings of the selected function. Press AUTO-button to exit. If you want to adjust any other function, repeat steps 2-3.
4). OSD Lock Function: To lock the OSD, press and hold the MENU-button while the monitor is off and then press power button to turn the monitor on. To un-lock the OSD - press and hold the MENU-button while the monitor is off and then press power button to turn the monitor on.

Notes:

1). If the product has only one signal input, the item of "Input Select" is disable to adjust.
2). DCR, Color Boost and Picture Boost, for these states that only one state can exist.

Luminance

	Contrast 0-100	Contrast from Digital-register.
	Brightness 0-100	Backlight Adjustment
	Eco mode	Standard Standard Mode
		Text	T	Text Mode
		Internet	e	Internet Mode
		Game	o	Game Mode
		Movie	o	Movie Mode
		Sports	?	Sports Mode
		Reading	R	Reading Mode
		Uniformity	#	Uniformity Mode
	Gamma	Gamma1		Adjust to Gamma 1
		Gamma2		Adjust to Gamma 2
		Gamma3		Adjust to Gamma 3
	DCR	Off		Disable dynamic contrast ratio
		On	DCR	Enable dynamic contrast ratio
	HDR	Off		Set the HDR profile according to your usage requirements.Note:When HDR is detected, the HDR option is displayed for adjustment.
		DisplayHDR
		HDR Picture
		HDR Movie
		HDR Game
	HDR Mode	Off		Adjust HDR Mode.
		HDR Picture
		HDR Movie
		HDR Game

Color Setup

	Color Temp.	Warm Recall W	Warm Color T	Temperature from EEPROM.
		Normal Recall	Normal Color	Temperature from EEPROM.
		Cool Recall Cool	Color Tem	perature from EEPROM.
		sRGB Recall S	RGB Color T	Temperature from EEPROM.
		User	Red Red Gain from Digital-register
			Green	Green Gain Digital-register.
			Blue	Blue Gain from Digital-register
	DCB Mode	Off	On or Off	Disable or Enable Off Mode
		Full Enhance	On or Off	Disable or Enable Full Enhance Mode
		Nature Skin	On or Off	Disable or Enable Nature Skin Mode
		Green Field	On or Off	Disable or Enable Green Field Mode
		Sky-blue	On or Off	Disable or Enable Sky-blue Mode
		Auto Detect	On or Off	Disable or Enable AutoDetect Mode
	DCB Demo		On or Off	Disable or Enable Demo
	Red		0-100	Red gain from Digital-register.
	Green		0-100	Green gain from Digital-register.
	Blue		0-100	Blue gain from Digital-register.

Note:

When "HDR Mode" under "Brightness" is set to a non-off state, all items under "Color Settings" cannot be adjusted.

Picture Boost

	Bright Frame On or Off Disable or Enable Bright Frame
	Frame Size 14-100 Adjust Frame Size
	Brightness 0-100 Adjust Frame Brightness
	Contrast 0-100 Adjust Frame Contrast
	H. position 0-100 Adjust Frame horizontal Position
	V. position 0-100 Adjust Frame vertical Position

Note:

1). For a better viewing experience, adjust the brightness, contrast, and position of the brightening.
2). When the „HDR Mode“ under „Brightness“ is set to a non-off state, all items under „Window Brightening“ cannot be adjusted.

OSD Setup

	Language Select the OSD language
	Timeout 5-120 Adjust the OSD Timeout
	DP Capability 1.1/1.2/1.4	Please be noted that only DP1.2 support AMD FreeSync Premium function
	H. Position 0-100 Adjust the horizontal position of OSD
	V. Position 0-100 Adjust the vertical position of OSD
	Volume 0-100 Volume Adjustment.
	Transparence 0-100 Adjust the transparence of OSD
	Break Reminder on or off	Break reminder if the user continuously work for more than 1hrs

PIP Setting

PIP	PIP Setting Off / PIP / PBP Disable or Enable PIP or PBP.
	Main Source Select main screen source.
	Sub Source Select sub screen source.
	Size Small / Middle / Large Select screen size.
	Position	Right-up	Set the screen location.
		Right-down
		Left-up
		Left-down
	Audio	On: PIP Audio	Disable or Enable Audio Setup.
		Off: Main Audio
	Swap	On: Swap	Swap the screen source.
		Off: non action

Game Setting

	Game Mode	Off No optimization by	Smart image game
		FPS	For playing FPS (first Person Shooters) games. Improves dark theme black level details.
		RTS	For playing RTS (Real Time Strategy). Improves the image quality.
		Racing	For playing Racing games, Provides fastest response time and high color saturation.
		Gamer 1 User's preference settings saved as Gamer 1.
		Gamer 2 User's preference settings saved as Gamer 2.
		Gamer 3 User's preference settings saved as Gamer 3.
	Shadow Control 0-100		Shadow Control Default is 50, then end-user can adjust from 50 to 100 or 0 to increase contrast for clear picture. 1. If picture is too dark to be saw the detail clearly, adjusting from 50 to 100 for clear picture. 2. If picture is too white to be saw the detail clearly, adjusting from 50 to 0 for clear picture
	Low Input Lag On/Off Turn off frame buffer to decrease input lag
	Game Color 0-20		Game Color will provide 0-20 level for adjusting saturation to get better picture.
	Low Blue Mode	Off / Reading / Office / Internet / Multimedia	Decrease blue light wave by controlling color temperature.
	Overdrive	Off	Adjust the response time.
		Weak
		Medium
		Strong
		Boost
	Frame Counter	Off / Right-up / Right-Down / Left-Down / Left-Up	Display V frequency on the corner selected
	MBR 0 ~ 20 Adjust	the Motion Blur Reduction.
	AMD FreeSync On/Off Adjust the AMD FreeSync Premium.

Note:
When the "HDR Mode" under "Brightness" is set to a non-off state, the "Game Mode", "Dark Field Control", and "Game Tone" items under "Game Settings" cannot be adjusted.

Extra

	Input Select Select Input Signal Source
	Off timer 0-24hrs Select DC off time
	Image Ratio	Wide / 4:3 / 1:1 / 17"(4:3) / 19"(4:3) / 19"(5:4) / 19"w(16:10) / 21.5"w(16:9) /22"w(16:10) / 23"w(16:9) / 23.6"W (16:9) /24"W (16:9) / 27"W (16:9)	Select image ratio for display.
	DDC/CI Yes or	No Turn on/off DDC/CI Support
	Reset Yes or No Reset the menu to default.

Exit

Exit Exit the main OSD

LED Indicator

Status LED Color
Full Power Mode White
Active-off Mode Orange

Troubleshoot

Problem & Question	Possible Solutions
Power LED Is Not ON	Make sure the power button is ON and the Power Cord is properly connected to a grounded power outlet and to the monitor.
No images on the screen	• Is the power cord connected properly?Check the power cord connection and power supply.• Is the cable connected correctly?(Connected using the VGA cable)Check the VGA cable connection.(Connected using the HDMI cable)Check the HDMI cable connection.(Connected using the DP cable)Check the DP cable connection.* VGA/HDMI/DP input is not available on every model.• If the power is on, reboot the computer to see the initial screen (the login screen), which can be seen.If the initial screen (the login screen) appears, boot the computer in the applicable mode (the safe mode for Windows 7/8/10) and then change the frequency of the video card.(Refer to the Setting the Optimal Resolution)If the initial screen (the login screen) does not appear, contact the Service Center or your dealer.• Can you see “Input Not Supported” on the screen?You can see this message when the signal from the video card exceeds the maximum resolution and frequency that the monitor can handle properly.Adjust the maximum resolution and frequency that the monitor can handle properly.• Make sure the AOC Monitor Drivers are installed.
Picture Is Fuzzy & Has Ghosting Shadowing Problem	Adjust the Contrast and Brightness Controls.Press to auto adjust.Make sure you are not using an extension cable or switch box. We recommend plugging the monitor directly to the video card output connector on the back.
Picture Bounces, Flickers Or Wave Pattern Appears In The Picture	Move electrical devices that may cause electrical interference as far away from the monitor as possible.Use the maximum refresh rate your monitor is capable of at the resolution you are using.
Monitor Is Stuck In Active Off-Mode"	The Computer Power Switch should be in the ON position.The Computer Video Card should be snugly fitted in its slot.Make sure the monitor's video cable is properly connected to the computer.Inspect the monitor's video cable and make sure no pin is bent.Make sure your computer is operational by hitting the CAPS LOCK key on the keyboard while observing the CAPS LOCK LED. The LED should either turn On or Off after hitting the CAPS LOCK key.
Missing one of the primary colors (RED, GREEN, or BLUE)	Inspect the monitor's video cable and make sure that no pin is damaged.Make sure the monitor's video cable is properly connected to the computer.
Screen image is not centered or sized properly	Adjust H-Position and V-Position or press hot-key (AUTO).
Picture has color defects (white does not look white)	Adjust RGB color or select desired color temperature.
Horizontal or vertical disturbances on the screen	Use Windows 7/8/10 shut-down mode to adjust CLOCK and FOCUS.Press to auto-adjust.
Regulation & Service	Please refer to Regulation & Service Information which is in the CD manual or www.aoc.com (to find the model you purchase in your country and to find Regulation & Service Information in Support page.

Specification

General Specification

Panel	Model name CU34P2X
	Driving system TFT Color LCD
	Viewable Image Size 86.36 cm diagonal
	Pixel pitch	0.23175mm(H) x 0.23175mm(V)
Others	Horizontal scan range	30k-160kHz(HDMI)30k-220kHz(DP)
	Horizontal scan Size(Maximum) 797.22mm
	Vertical scan range	48-120Hz(HDMI)48-144Hz(DP)
	Vertical Scan Size(Maximum) 333.72mm
	Max resolution	3440x1440@100Hz(HDMI)3440x1440@144Hz(DP)
	Plug & Play VESA DDC2B/CI
	Power Source 100-240V~, 50/60Hz,	1.5A
	Power Consumption	Typical(Brightness = 50,Contrast = 50) 67W
		Max. (brightness = 100, contrast =100)	≤ 114W
		Standby mode	≤ 0.5W
Physical Characteristics	Connector Type HDMIx2/DPx2/USBx4/USB Upstream/Earphone
	Signal Cable Type	Detachable
Environmental	Temperature	Operating 0°~ 40°
		Non-Operating -25°~ 55°
	Humidity	Operating 10% ~ 85% (non-condensing)
		Non-Operating 5% ~ 93% (non-condensing)
	Altitude	Operating 0~ 5000 m (0~ 16404ft)
		Non-Operating 0~ 12192m (0~ 40000ft)

Preset Display Modes

STANDARD RESOLUTION		HORIZONTAL FREQUENCY(kHz)	VERTICAL FREQUENCY(Hz)
VGA	640x480@60Hz 31.469 59.94
	640x480@72Hz 37.861 72.809
	640x480@75Hz 37.5 75
	640x480@100Hz 52.89 99.42
SVGA	800x600@60Hz 37.879 60.317
	800x600@72Hz 48.077 72.188
	800x600@75Hz 46.875 75
	800x600@100Hz 63.88 99.97
XGA	1024x768@60Hz 48.363 60.004
	1024x768@70Hz 56.476 70.069
	1024x768@75Hz 60.023 75.029
	1024x768@100Hz 80.46 99.83
SXGA	1280x1024@60Hz 63.981 60.020
	1280x1024@75Hz 79.976 75.025
WXGA+	1440x900@60Hz 55.935 59.887
	1440x900@60Hz 55.469 59.901
WSXGA	1680x1050@60Hz 65.290 59.954
	1680x1050@60Hz 64.674 59.883
HD 1920x1080@60Hz 67.5 60
QHD	2560x1080@60Hz 66 60
	2560x1080@50Hz 56.25 50
	2560x1080@120Hz 150 120
	2560x1080@120Hz 137.22	119.95
WQHD	3440x1440@60Hz 89.819 59.973
	3440x1440@100Hz 150.972	99.982
	3440x1440@120Hz(Only DP connect)	181.2 120
	3440x1440@144Hz(Only DP connect)	214.56 144
IBM MODE
DOS	720x400@70Hz 31.469 70.087
MAC MODE
VGA	640x480@67Hz 35.000 66.667
SVGA	832x624@75Hz 49.725 74.551

Pin Assignments

19-Pin Color Display Signal Cable

Pin No.	Signal Name Pin No. Signal	Name	Pin No. Signal Name
1. TMDS	Data 2+ 9. TMDS Data 0- 17. DDC/CEC Ground
2. TMDS	Data 2 Shield 10. TMDS Clock + 18.	+5V Power
3. TMDS	Data 2- 11. TMDS Clock Shield 19. Hot Plug Detect
4. TMDS	Data 1+ 12. TMDS Clock-
5. TMDS	Data 1Shield 13. CEC
6. TMDS	Data 1- 14. Reserved (N.C. on device)
7. TMDS	Data 0+ 15. SCL
8. TMDS	Data 0 Shield 16. SDA

20-Pin Color Display Signal Cable

Pin No. Signal Name Pin No. Signal Name
1 ML_Lane 3 (n) 11 GND
2 GND	12 ML_Lane 0 (p)
3 ML_Lane 3 (p)	13 CONFIG1
4 ML_Lane 2 (n)	14 CONFIG2
5 GND	15 AUX_CH(p)
6 ML_Lane 2 (p)	16 GND
7 ML_Lane 1 (n)	17 AUX_CH(n)
8 GND	18 Hot Plug Detect
9 ML_Lane 1 (p)	19 Return DP_PWR
10	ML_Lane 0 (n)	20	DP_PWR

Plug and Play

Plug & Play DDC2B Feature

This monitor is equipped with VESA DDC2B capabilities according to the VESA DDC STANDARD. It allows the monitor to inform the host system of its identity and, depending on the level of DDC used, communicate additional information about its display capabilities.

The DDC2B is a bi-directional data channel based on the I2C protocol. The host can request EDID information over the DDC2B channel.