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February 2021

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Subject:
Re: not all ports detected on 7-port Sabrent usb hub
From:
Konstantin Olchanski <[log in to unmask]>
Reply To:
Konstantin Olchanski <[log in to unmask]>
Date:
Fri, 12 Feb 2021 14:11:52 -0800
Content-Type:
text/plain
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>
> As for “$1 devices”, my Sabrent hub cost $36.99 before tax.  I am curious
> where one goes for a “real” hub (at least 7 ports) — although somehow I
> have a hunch that there are many different definitions of “real” out
> there.
>

I tend to go by manufacturer respectability rather than price. For network gear, joints like Juniper
would be 1st tier, joints like ASUS and Linksys are maybe 2nd tier, stuff sold in London Drugs
with "made in USA" label covering a "made in China" label convering a "make in Taiwan" label is 3rd tier.
Have not looked at USB stuff recently, but same idea.

>
> ################# dmesg output #################
> [27424.944664] usb 5-1.3: new high-speed USB device number 24 using xhci_hcd
> [27425.035451] usb 5-1.3: New USB device found, idVendor=0bda, idProduct=5411, bcdDevice= 1.36
> [27425.035465] usb 5-1.3: Product: 4-Port USB 2.0 Hub
> [27425.037951] hub 5-1.3:1.0: USB hub found
> [27425.039281] hub 5-1.3:1.0: 4 ports detected
> [27425.315678] usb 5-1.3.4: new high-speed USB device number 25 using xhci_hcd
> [27425.416560] usb 5-1.3.4: New USB device found, idVendor=0bda, idProduct=5411, bcdDevice= 1.36
> [27425.416574] usb 5-1.3.4: Product: 4-Port USB 2.0 Hub
> [27425.418566] hub 5-1.3.4:1.0: USB hub found
> [27425.419901] hub 5-1.3.4:1.0: 4 ports detected

Looks like your device is 2 cascaded 4 port USB hubs. Only USB2 hub is detected, so possibilities:

- the USB3 hub component is not supported
- you are connected to a USB2 port in your computer
- you have a USB2 cable between computer and hub

USB idVendor 0BDA, idProduct 5411 is a Realtek RTS-5411 chip:
https://urldefense.proofpoint.com/v2/url?u=https-3A__devicehunt.com_view_type_usb_vendor_0BDA_device_5411&d=DwIDaQ&c=gRgGjJ3BkIsb5y6s49QqsA&r=gd8BzeSQcySVxr0gDWSEbN-P-pgDXkdyCtaMqdCgPPdW1cyL5RIpaIYrCn8C5x2A&m=9RT_QbE5MKyrbOu3FBU8XX_WGxM-cswGe02M-VBN0eo&s=O_-gbOH5EjVMaUHBPS8IdRgk608wYOy7h-cUTpCKxQ8&e= 

Data sheet:
https://urldefense.proofpoint.com/v2/url?u=https-3A__datasheetspdf.com_pdf-2Dfile_1146777_Realtek_RTS5411_1&d=DwIDaQ&c=gRgGjJ3BkIsb5y6s49QqsA&r=gd8BzeSQcySVxr0gDWSEbN-P-pgDXkdyCtaMqdCgPPdW1cyL5RIpaIYrCn8C5x2A&m=9RT_QbE5MKyrbOu3FBU8XX_WGxM-cswGe02M-VBN0eo&s=CBzYq4qVgEBTf5XOp2JAE2qcQOBDeH3AWDoaBJ3Y7sc&e= 

Per data sheet, is a 4 port USB2/USB3 hub (so 2x 4-port hubs detected by linux is correct).

The best I can tell, linux drives it with the generic USB hub driver.

So:

a) all 7 ports should work (in USB2 mode, so plug a mouse or a keyboard to check)
b) no idea why the USB3 component is not detected. most likely you are plugged into a USB2 port (or a USB3 port disabled in the BIOS, or blownup, etc)

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada

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