I recently found the Intel white paper on this general issue from years ago. What will NOT consistently boot is Pi4 + USB3 + 2.4Ghz wireless. Pi4 + USB2 + 2.4Ghz wireless (+ Powered USB3 hub in downgrade USB2 mode) works fine. cableup USB2 port, boot, then move cable to USB3 after ~minute). Very curiously, I can most often get stable USB3 with 2.4Ghz AFTER booting with USB2 (i.e. NOT mapped back to a 2.4Ghz "infrastructure" internet source). Pi4 + USB3 + hard wired (cable) Ethernet is ok Pi4 + USB3 + 5Ghz wireless should be fine. That said, the Pi4 + USB3 CAN work great under certain circumstances: I believe those Pi4s that ARE working are not using USB3 + 2.4Ghz wireless networking (or fortune has smiled on them greatly). Too many variables! Many have responded to my prior posts that their Pi4 setups work fine. Cable lengths and device distances also factor in the RF interference 2.4Ghz. Some particular Pi4 casings can help (better grounding), others will hurt. Poor shielding (cables and connectors) can magnifiy the issue, but even good cables won't eliminate the problem. Pi4 is an almost perfect 2.4Ghz wireless self-jamming device due to having its USB3 ports and HDMI ports in close proximity to the wifi antenna (top of board near GPIO pins 1-6). The symptom is that the 2.4Ghz wireless network will either not be visible, or will drop back to hotspot as soon as USB3 is detected (boot time or at cable reconfig). This ONLY occurs for USB3 + 2.4Ghz connections. What many suggest is "power issues" turns out to be USB3 RF interference. The long and short is that the Pi4's USB3 ports are jamming 2.4Ghz Wifi. Hopefully this note will help others avoid my experience. Finally, after a month+ of pulling my hair out trying to get my config to work right, I think I finally understand what is going wrong. Many here have seen my prior posted struggles with USB3, Pi4, and wireless.
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