Date: Thu, 2 Nov 2023 15:01:19 +0000 From: void <void@f-m.fm> To: freebsd-arm@freebsd.org Subject: usb2 problems when connecting multiple devices Message-ID: <ZUO5v-qTnqlw0RlV@int21h>
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I've noticed that when more than one device is connected to the onboard usb2 ports,
one device's (signalling? i guess) interferes with the other, knocking it offline.
It's happened in a number of contexts, only with this hardware:
1. where the os is 13-stable
2. recent 14-stable
3. usb2 is keyboard & wireless mouse
4. usb2 is run0: MAC/BBP RT5390 firmware RT3071 wlan0 & plain usb2 cable
connecting to a UPS.
5. the pi4 has the recommended 3.1A PSU
At the moment, I don't have a spare usb2 hub to plug into a usb2 port.
I've worked around the situation previously, either by using a powered
usb3 hub into a usb3 port and plugging the usb2 devices into the hub,
and/or using just one usb2 device in one usb2 port and leaving the
other on-board usb2 port empty.
But both usb ports should be usable and not knock each other offline.
How can I capture relevant information for this for a PR?
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