The OLED is not turning on. Do I need to do something to activate it?

Hi, Yes, about how to enable the OLED, pls refer to: wiki.geekworm.com/PiKVM-A3#Enable_OLED_display best regards, Geekworm Team

Why doesn't this come with the 10-pin i2s audio cable?

The current PiKVM OS does support audio. It has for a while now. Just no cable or support from Geekworm. I'm giving them a shot to respond but I'm likely returning this thing.

Is it possible to use this without ATX and only the power adapter?

The ATX component is used to control the power on/off of the PC you are connected to. The ATX does not power the Geekworm KVM-A3. The Geekworm KVM-A3 is powered via USB-C power.

How many computers can you control from a single pikvm?

As designed it controls one computer. It connects directly to the target computer via HDMI (video) and a special USB cable (remote keyboard) as well as the front panel power controls for remote computer on/off control. Although I have never done it (and this may not work properly), perhaps the HDMI and USB control can be switched between computers with a traditional KVM for video/keyboard control but the power control cables are for one computer only.

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Geekworm KVM-A3 Kit With Raspberry Pi 4 Case Compatible With PiKVM ATX HDMI CSI for Model B Only (Not Include Pi)

Geekworm KVM-A3 Kit With Raspberry Pi 4 Case Compatible With PiKVM ATX HDMI CSI for Model B Only (Not Include Pi)

Product ID: 559234308

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Details

Brand
Geekworm
Model Name
KVM-A3
CPU Model
ARMv7
Connectivity Technology
Ethernet HDMI
Included Components
1 x Ethernet 1

💻Full remote PC control

🔌5V 4A USB-C power input

🧊Active cooling fan onboard

Description

🌐 Take control beyond your desk—your PC, anywhere, anytime!

COMPLETE KVM KIT - Includes metal case, expansion boards, HDMI-to-CSI module, Ethernet cable, and OLED display for instant setup.
PLUG PLAY POWER - Dedicated 5V 4A USB-C input ensures stable, uninterrupted operation—no Pi port conflicts.
ADVANCED COOLING SYSTEM - Integrated 3007 fan keeps your Pi 4 cool under heavy remote KVM workloads for reliable performance.
SEAMLESS REMOTE COMMAND - Control your PC’s power, BIOS, and OS reinstall from any browser—no VPN or extra software needed.
RASPBERRY PI 4 OPTIMIZED - Precision-engineered metal case and expansion boards designed exclusively for Pi 4 Model B variants.

The Geekworm KVM-A3 Kit transforms your Raspberry Pi 4 into a powerful remote KVM device, enabling full hardware-level control of your PC via web browser. Designed exclusively for Pi 4 Model B, it features a robust metal case, active cooling fan, and dedicated power input for stable operation. The kit includes all essential components—expansion boards, HDMI-to-CSI module, Ethernet cable, and OLED display—making it the ultimate solution for IT pros and tech-savvy managers seeking seamless remote access and control.

Specifications

Brand	Geekworm
Manufacturer	Geekworm
Model	TB-2022-51
Model Name	KVM-A3
Product Dimensions	9.2 x 6.5 x 4.2 cm; 319 g
Item model number	TB-2022-51
Ram Memory Technology	DDR4
Operating System	V3 HAT Platform
Processor Brand	Broadcom
Processor Type	ARMv7
Processor Count	1
Hardware Interface	USB
Compatible Devices	Personal Computer
Mounting Hardware	1 x Ethernet Cable(1m length), 1 x X630-A5 V1.0 Adapter Board with Accessories, 1 x KWM-A3 Metal Case with Accessories, 1 x X630-A3 V1.3 Expansion Board with Accessories, 1 x X630 HDMI to CSI-2 Module with Accessories, 1 x 0.96 inch OLED Module
Number of items	1
Batteries Included	No
Batteries Required	Yes
Wireless Type	802.11b
Total USB ports	4
Connector Type	Ethernet, HDMI
Manufacturer	Geekworm
Item Weight	319 g