Re: [gentoo-user] Re: new USB question

[Jack]

Grant - thanks for the info.

On 2020.10.04 21:41, Grant Edwards wrote:
> On 2020-10-05, Jack <ostroffjh@×××××××××××××××××.net> wrote:
>
>> Still not Gentoo specific, but I'm still trying to figure out if my
>> motherboard (MSI B350 Tomahawk) is doing something funny with the
>> USB connections.  In theory, there should be USB3 connections both
>> on the back IO panel and on the front case ports.
> I don't know if this is helpful, but I have an MSI B450 Tomahawk Max,
> and the USB3.3 headers that I route to front-panel connectors work
> fine. I just plugged a USB3 flash drive into one of them:
>
> [299865.738407] usb 2-4: new SuperSpeed Gen 1 USB device number 2
> using xhci_hcd
> [299865.760045] usb 2-4: New USB device found, idVendor=05dc,
> idProduct=a838, bcdDevice=11.00
> [299865.760051] usb 2-4: New USB device strings: Mfr=1, Product=2,
> SerialNumber=3
> [299865.760053] usb 2-4: Product: USB Flash Drive
> [299865.760056] usb 2-4: Manufacturer: Lexar
> [299865.760058] usb 2-4: SerialNumber: AAHDQZ7ENQ3ORRPS
> [299865.770842] usb-storage 2-4:1.0: USB Mass Storage device detected
> [299865.771034] scsi host9: usb-storage 2-4:1.0
> [299867.095086] scsi 9:0:0:0: Direct-Access     Lexar    USB Flash
> Drive  1100 PQ: 0 ANSI: 6
> [299867.095310] sd 9:0:0:0: Attached scsi generic sg4 type 0
> [299867.095905] sd 9:0:0:0: [sdd] 62517248 512-byte logical blocks:
> (32.0 GB/29.8 GiB)
> [299867.096389] sd 9:0:0:0: [sdd] Write Protect is off
> [299867.096394] sd 9:0:0:0: [sdd] Mode Sense: 43 00 00 00
> [299867.096872] sd 9:0:0:0: [sdd] Write cache: enabled, read cache:
> enabled, doesn't support DPO or FUA
> [299867.112375]  sdd: sdd1 sdd2
> [299867.114301] sd 9:0:0:0: [sdd] Attached SCSI removable disk
>
> I also have two USB2 connectors on the front panel.
>
> All total, there are
>
>   2 x USB2    in back panel
>   4 x USB3.2  in back panel
>
>   4 x USB2    on two dual-port 10-pin headers
>   2 x USB3.2  on one dual-port 20-pin header
>
> It appears that I have a total of 6 USB hubs on the motherboard:
>
> $ lsusb
> Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
> Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
> Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>
> It looks like you should have two 20-pin USB3 headers on your
> motherboard (mine only has 1).  Are you sure your front-panel
> connectors are plugged into a USB3 header and not one of the 10-pin
> USB2 headers?
Front panel is definitely plugged into one of the two USB3 headers.   
There are also two USB2 headers, unused.

lsusb -tv shows
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
     ID 1d6b:0003 Linux Foundation 3.0 root hub
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
     ID 1d6b:0002 Linux Foundation 2.0 root hub
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 10000M
     ID 1d6b:0003 Linux Foundation 3.0 root hub
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/10p, 480M
     ID 1d6b:0002 Linux Foundation 2.0 root hub

extracted from dmesg
[    8.465096] xhci_hcd 0000:03:00.0: xHCI Host Controller
[    8.465728] xhci_hcd 0000:03:00.0: new USB bus registered, assigned  
bus number 1
[    8.521723] xhci_hcd 0000:03:00.0: hcc params 0x0200ef81 hci version  
0x110 quirks 0x0000000048000410
[    8.523257] usb usb1: New USB device found, idVendor=1d6b,  
idProduct=0002, bcdDevice= 5.08
[    8.523974] usb usb1: New USB device strings: Mfr=3, Product=2,  
SerialNumber=1
[    8.524693] usb usb1: Product: xHCI Host Controller
[    8.525411] usb usb1: Manufacturer: Linux 5.8.10-gentoo-x86_64-01  
xhci-hcd
[    8.526141] usb usb1: SerialNumber: 0000:03:00.0
[    8.526931] hub 1-0:1.0: USB hub found
[    8.527674] hub 1-0:1.0: 10 ports detected

[    8.528580] xhci_hcd 0000:03:00.0: xHCI Host Controller
[    8.529307] xhci_hcd 0000:03:00.0: new USB bus registered, assigned  
bus number 2
[    8.530042] xhci_hcd 0000:03:00.0: Host supports USB 3.1 Enhanced  
SuperSpeed
[    8.530809] usb usb2: We don't know the algorithms for LPM for this  
host, disabling LPM.
[    8.531568] usb usb2: New USB device found, idVendor=1d6b,  
idProduct=0003, bcdDevice= 5.08
[    8.532313] usb usb2: New USB device strings: Mfr=3, Product=2,  
SerialNumber=1
[    8.533049] usb usb2: Product: xHCI Host Controller
[    8.533780] usb usb2: Manufacturer: Linux 5.8.10-gentoo-x86_64-01  
xhci-hcd
[    8.534524] usb usb2: SerialNumber: 0000:03:00.0
[    8.535329] hub 2-0:1.0: USB hub found
[    8.536081] hub 2-0:1.0: 4 ports detected

[    8.536954] xhci_hcd 0000:1d:00.3: xHCI Host Controller
[    8.537710] xhci_hcd 0000:1d:00.3: new USB bus registered, assigned  
bus number 3
[    8.538558] xhci_hcd 0000:1d:00.3: hcc params 0x0270f665 hci version  
0x100 quirks 0x0000000000000410
[    8.539440] usb usb3: New USB device found, idVendor=1d6b,  
idProduct=0002, bcdDevice= 5.08
[    8.540200] usb usb3: New USB device strings: Mfr=3, Product=2,  
SerialNumber=1
[    8.540954] usb usb3: Product: xHCI Host Controller
[    8.541701] usb usb3: Manufacturer: Linux 5.8.10-gentoo-x86_64-01  
xhci-hcd
[    8.542449] usb usb3: SerialNumber: 0000:1d:00.3
[    8.543252] hub 3-0:1.0: USB hub found
[    8.543981] hub 3-0:1.0: 4 ports detected

[    8.544894] xhci_hcd 0000:1d:00.3: xHCI Host Controller
[    8.545636] xhci_hcd 0000:1d:00.3: new USB bus registered, assigned  
bus number 4
[    8.546389] xhci_hcd 0000:1d:00.3: Host supports USB 3.0 SuperSpeed
[    8.547153] usb usb4: We don't know the algorithms for LPM for this  
host, disabling LPM.
[    8.547939] usb usb4: New USB device found, idVendor=1d6b,  
idProduct=0003, bcdDevice= 5.08
[    8.548730] usb usb4: New USB device strings: Mfr=3, Product=2,  
SerialNumber=1
[    8.549531] usb usb4: Product: xHCI Host Controller
[    8.550322] usb usb4: Manufacturer: Linux 5.8.10-gentoo-x86_64-01  
xhci-hcd
[    8.551126] usb usb4: SerialNumber: 0000:1d:00.3
[    8.551986] hub 4-0:1.0: USB hub found
[    8.552793] hub 4-0:1.0: 4 ports detected

I'm curious about the pairing by PCI device - it's not clear if the  
every root_hub is a real controller, or not.  The specs of the board  
say USB2: two ports on the back and two USB2 headers (so I don't know  
why it claims 10 ports instead of 6) and USB3: three type A and one  
Type C ports on the back.  Bus 2 is a bit of a mystery, as although the  
B350 chipset presumably does have an enhanced superspeed (3.1)  
controller, it is not available through the motherboard.  If bus 3 is  
the unavailable 3.1 controller, then is bus 1 driven by the CPU or the  
chipset, and where is the other one?  So far, anything plugged into any  
of the front ports or rear USB2 ports shows up on bus 1, and anything  
plugged into the rear USB3 ports shows up on bus 3.  I think my new USB  
flash drive is really USB2 and not USB3 as advertised.

Later, I'll reboot into Windows to see what that shows, as MSI tech  
support refuses to talk about Linux.

Jack