Can't reattach USB devices (Lenovo bug?)

Hello,

at first I thought I had found a regression in CURRENT (2020-01-19), and now I'm not so sure since, before reporting I rolled back a recent BIOS upgrade and that got rid of the issue.

First of all, the hardware: Lenovo ThinkPad A485 (AMD Ryzen 
processor).

The issue (BIOS v1.28[1]) being that any USB device: would work on 
first plug, but if unplugged and plugged again, it wouldn't work 
(see dmesg below).

Downgrading to BIOS v1.24 results in the issue disappearing.

How should this be dealt with? Could this be something FreeBSD 
needs better support for? or is it entirely on Lenovo?
If the former, how can I help provide more information/testing(*)?
If the latter, should I inform Lenovo of the issue? If anyone has 
experience with that, I'd appreciate pointers as to how to provide 
them with information in a way that makes it somewhat likely that 
things get solved.

[1]: BIOS Release notes: 
https://download.lenovo.com/pccbbs/mobiles/r0wuj60w.txt
(*): Helping spot bugs and provide information/testing is why I'm 
running CURRENT after all

Just FTR: I also experienced random kernel panics [2] with 
versions v1.22 and v1.16 of the BIOS, so maybe Lenovo is being 
unreasonable/unreliable about BIOS upgrades.
In any case I am curious as to how other OS deal with this class 
of issues and how FreeBSD could (if possible at all) work better 
in these cases.

[2]: Kernel panic solved by BIOS upgrade (to v1.24) see: 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239351

Also FTR, this was the contents of dmesg with BIOS v1.28 and CURRENT as of 2020-01-19:
(notice there are multiple disconnect and reconnect attempts of 
different devices)

ugen1.2: <ALCOR USB Hub 2.0> at usbus1 (disconnected)
uhub4: at uhub1, port 1, addr 1 (disconnected)
ugen1.3: <BTC USB Multimedia Keyboard> at usbus1 (disconnected)
ukbd0: at uhub4, port 2, addr 2 (disconnected)
ukbd0: detached
uhid0: at uhub4, port 2, addr 2 (disconnected)
uhid0: detached
ugen1.4: <ALCOR USB Hub 2.0> at usbus1 (disconnected)
uhub5: at uhub4, port 4, addr 3 (disconnected)
ugen1.5: <SteelSeries SteelSeries Rival 310 eSports Mouse> at 
usbus1 (disconnected)
uhid1: at uhub5, port 1, addr 4 (disconnected)
uhid1: detached
ums0: at uhub5, port 1, addr 4 (disconnected)
ums0: detached
ukbd1: at uhub5, port 1, addr 4 (disconnected)
ukbd1: detached
uhub5: detached
uhub4: detached
ugen1.2: <ALCOR USB Hub 2.0> at usbus1
uhub4 on uhub1
uhub4: <ALCOR USB Hub 2.0, class 9/0, rev 2.00/7.02, addr 1> on 
usbus1
acpi_ec0: EcCommand: no response to 0x84
uhub4: 4 ports with 4 removable, self powered
acpi_ec0: EcCommand: no response to 0x84
acpi_ec0: EcCommand: no response to 0x84
acpi_ec0: GPE query failed: AE_NO_HARDWARE_RESPONSE
usbd_setup_device_desc: getting device descriptor at addr 2 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 2 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 2 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 2 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 2 
failed, USB_ERR_TIMEOUT
ugen1.3: <Unknown > at usbus1 (disconnected)
uhub_reattach_port: could not allocate new device
ugen1.2: <ALCOR USB Hub 2.0> at usbus1 (disconnected)
uhub4: at uhub1, port 1, addr 1 (disconnected)
uhub4: detached
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
ugen1.2: <Unknown > at usbus1 (disconnected)
uhub_reattach_port: could not allocate new device
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
usbd_setup_device_desc: getting device descriptor at addr 1 
failed, USB_ERR_TIMEOUT
--
Evilham