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 threadrevenge of the boltzmann brain
@root42 Check the pins in the connectors. I had a problem like this where in a thumb drive some pins belonging to USB3 were bent / damaged and it would not work in a USB3 port. Although it worked fine in a USB2 port, those 4 pins were not damaged.
Mar 9 at 5:26pmWeb
Show threadrevenge of the boltzmann brainMar 9
@root42 with USB-C it could also be the wrong type of cable.
Show threadroot42Mar 9
@robert no. It works in the Live thumbdrive. Only the proper install on the ssd is botched. The ports work fine.
Show threadroot42Mar 9
@robert the USB C thumbdrive connects without a cable. It works in the live system, not in the installed system.