rdmsm4x-changelog-20260905-1642-pro-display-xdr-firmware-audit

Audit of Apple Pro Display XDR 32" firmware versions across the three desk-adjacent workstations (rdmsm4x, rdmpw3275m, rdmpw3265m) compared against Apple's latest production firmware release.

Executive Summary

Latest Apple Firmware: Display Firmware 4.2.37 | Thunderbolt Controller Firmware 55.2 (Link Controller 1.41.0).
Fleet Finding: All three Pro Display XDR monitors are running the latest firmware (4.2.37 / 55.2).
Hot-Plug Diagnostic Note on rdmsm4x: After the user power-cycled/unplugged the display for 30-60 seconds, system_profiler SPDisplaysDataType logged an expected HID reporting timeout (Command 20 / 0xe0005000) while the USB/HID management bridge re-negotiates with SkyLight/WindowServer. The underlying IOKit hardware registers confirm identical hardware revision 0x1, bcdDevice 16396 (0x400C), and Thunderbolt firmware 55.2.

Detailed Detection Matrix

Host	Workstation Model	Display Serial Number	Display Firmware	Thunderbolt Firmware	Link Controller	Status
rdmsm4x	Mac Studio M4 Max	`C02G500BML9W`	4.2.37 (IOKit: 16396)	55.2	1.41.0	Up to Date
rdmpw3275m	Mac Pro 2019	`C02G6042ML9W`	4.2.37	55.2	1.41.0	Up to Date
rdmpw3265m	Mac Pro 2019	`C02L902UML9W`	4.2.37	55.2	1.41.0	Up to Date

Detailed Findings per Host

1. rdmsm4x (Local Host — Mac Studio M4 Max)

Display Model: Apple Pro Display XDR 32" (Retina 6K, 6016 x 3384)
Internal USB Hub Serial: C02G500BML9W
USB Device Serial: C02123300VYJLC0AG
Thunderbolt Link: Bus 0, Port 1 (Upstream 40 Gb/s)
- Device ID: 0x801F, Vendor ID: 0x0001, Revision: 0x1
- Firmware Version: 55.2
- Link Controller Firmware Version: 1.41.0
IOKit USB Properties:
- idProduct: 37443 (0x9243)
- bcdDevice: 16396 (0x400C)
- VersionNumber: 16396 (Identical to rdmpw3275m and rdmpw3265m)
Hot-Plug Diagnostic: Unplugging the display for 30-60s causes the HID management endpoint to return 0xe0005000 on HIDDisplayIOReportingSetOutputData until full system restart or link re-negotiation. Video rendering and Thunderbolt 3 links operate at full 6K 60Hz.

2. rdmpw3275m (Mac Pro 2019 — Slot 1 Vega II Duo)

Display Serial Number: C02G6042ML9W
USB Device Serial: C021264005BJLC0AX
Display Firmware Version: 4.2.37
Thunderbolt Link: Bus 3, Port 7 (40 Gb/s)
- Firmware Version: 55.2
- Link Controller Firmware Version: 1.41.0
IOKit USB Properties:
- bcdDevice: 16396 (0x400C)
- VersionNumber: 16396

3. rdmpw3265m (Mac Pro 2019 — Slot 1 W5500X)

Display Serial Number: C02L902UML9W
USB Device Serial: C023332005EJLC0AY
Display Firmware Version: 4.2.37
Thunderbolt Link: Bus 3, Port 7 (40 Gb/s)
- Firmware Version: 55.2
- Link Controller Firmware Version: 1.41.0
IOKit USB Properties:
- bcdDevice: 16396 (0x400C)
- VersionNumber: 16396

Verification Commands

# On local host (rdmsm4x):
ioreg -p IOUSB -l -w0 -n "Pro Display XDR" | grep -iE 'bcdDevice|VersionNumber|kUSBSerialNumberString'
system_profiler SPThunderboltDataType

# On remote hosts (rdmpw3275m, rdmpw3265m):
system_profiler SPDisplaysDataType SPThunderboltDataType