root42Mar 8

I have an issue with mounting a cheap smart watch in #linux: Device is seen by the kernel, but never registered as a storage device /dev/sd*:

usb 1-2: new full-speed USB device number 3 using xhci_hcd
usb 1-2: New USB device found, idVendor=0e8d, idProduct=0002, bcdDevice= 1.00
...
usb-storage 1-2:1.0: USB Mass Storage device detected
scsi host0: usb-storage 1-2:1.0

Show threadroot42Mar 8
Ok, the plot thickens. When booting from the Linux Mint USB stick, the USB ports work. But when booting the installed version, USB ports are broken. Why??
Show threadroot42Mar 9
So my current working hypothesis is: Live Linux Mint uses kernel 6.14, my installation uses kernel 6.17. This is probably what causes the regression?
So I might want to downgrade the kernel...
#linux #linuxmint
Show threadroot42Mar 9
Nope, that was not it. I downgraded to Linux 6.14.0-37, but USB still doesn't work. So it must be something with my installation! But what?
Show threadroot42Mar 9
I am onto something: Attaching an OLD Apple keyboard with a USB-C to A adapter WORKS. But all my USB3.x devices do NOT work!
So how do I tell the USB controller to also work with USB3 devices...? Which works on the live thumbdrive!
Show threadroot42Mar 9
Yes, so it seems the controller is stuck in EHCI mode, instead of switching to xHCI for USB3 devices. Bummer... how to switch it back...?
Show threadSebastiaanMar 9

@root42 Is your USB controller properly listed in `lspci`? And if it is, what kernel options does it use (see with `lspci -s <address of controller> -k`. For example, here's mine:

04:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne USB 3.1
Subsystem: Advanced Micro Devices, Inc. [AMD] Renoir/Cezanne USB 3.1
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci

Show threadroot42

@sebastiaanfranken Seems so:

07:00.0 USB controller: Intel Corporation JHL6540 Thunderbolt 3 USB Controller (C step) [Alpine Ridge 4C
2016] (rev 02)
Subsystem: Intel Corporation JHL6540 Thunderbolt 3 USB Controller (C step) [Alpine Ridge 4C 2016]
Kernel driver in use: xhci_hcd

Mar 9 at 11:02amWeb
Show threadSebastiaanMar 9

@root42 Ok, so that's good. Also the fact the proper hcd (xhci_hcd) module is loaded is good. Anything related to it in your system journal? And if you want you can get more output / info with

> sudo lspci -s 07:00.0 -k -v

Show threadroot42Mar 9
@sebastiaanfranken First the lspci output
Show threadroot42Mar 9
@sebastiaanfranken Then syslog:
https://privatebin.net/?83d299418ae3e05a#2ZQSiucLStRySg7yKv35MQ799oqivhZVM8ftmKLAyxQ8
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