On Fri, Feb 12, 2021 at 10:37:11AM -0800, Konstantin Olchanski wrote:
> On Thu, Feb 11, 2021 at 04:17:46PM -0500, Stephen L. Talbott wrote:
> >
> > Is there an reason why a rather vanilla SL-7.9 system might report “4
> > ports detected” on a new, Sabrent 7-port, powered USB 3.0 hub (HB-BUP7)?
> >
>
> Some of these usb switches have interesting internal structure (separate usb2
> and usb3 hubs, two 4-port hubs cascaded from each other, etc) and the linux
> usb hub driver may be confused and fail to enable all the ports.
>
> You can see the bus structure that linux can see in the output
> of "lsusb" and in /sys/bus/usb/devices/. There may be some error
> messages in "dmesg" ("cannot enable port", etc).
>
> And possibility of defective device cannot be ruled out,
> these $1 products do not go through any QA.
>
> Also if you have reports of device "HB-BUP7" working for somebody,
> it means nothing. Makers of $1 USB devices are notorious
> for shipping completeley different devices (different chips,
> different linux drivers) under the same part number. Bait-and-switch
> in action.
>
> --
> 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
Thanks for the comments, which are helpful background. I am appending
below the dmesg content that immediately follows my connecting the hub. I
am not qualified to read much into the messages, but there seem to be no
errors reported. However, there ARE a good number of lines like these
two:
systemd-journald[506]: no db file to read /run/udev/data/c189:535: No
such file or directory
systemd-journald[506]: no db file to read
/run/udev/data/+usb:5-1.3.4:1.0: No such file or directory
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. My machine is an HP desktop for personal work, not a server for
critical services.
################# 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
[27425.035460] usb 5-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[27425.035465] usb 5-1.3: Product: 4-Port USB 2.0 Hub
[27425.035470] usb 5-1.3: Manufacturer: Generic
[27425.035860] systemd-journald[506]: no db file to read /run/udev/data/c189:535: No such file or directory
[27425.036081] systemd-journald[506]: no db file to read /run/udev/data/c189:535: No such file or directory
[27425.036253] systemd-journald[506]: no db file to read /run/udev/data/c189:535: No such file or directory
[27425.036408] systemd-journald[506]: no db file to read /run/udev/data/c189:535: No such file or directory
[27425.037951] hub 5-1.3:1.0: USB hub found
[27425.038991] systemd-journald[506]: no db file to read /run/udev/data/+usb:5-1.3:1.0: No such file or directory
[27425.039281] hub 5-1.3:1.0: 4 ports detected
[27425.039922] systemd-journald[506]: no db file to read /run/udev/data/+usb:5-1.3:1.0: No such file or directory
[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
[27425.416569] usb 5-1.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[27425.416574] usb 5-1.3.4: Product: 4-Port USB 2.0 Hub
[27425.416578] usb 5-1.3.4: Manufacturer: Generic
[27425.417474] systemd-journald[506]: no db file to read /run/udev/data/c189:536: No such file or directory
[27425.417783] systemd-journald[506]: no db file to read /run/udev/data/c189:536: No such file or directory
[27425.418566] hub 5-1.3.4:1.0: USB hub found
[27425.419153] systemd-journald[506]: no db file to read /run/udev/data/+usb:5-1.3.4:1.0: No such file or directory
[27425.419901] hub 5-1.3.4:1.0: 4 ports detected
[27425.420967] systemd-journald[506]: no db file to read /run/udev/data/+usb:5-1.3.4:1.0: No such file or directory
[27484.039490] systemd-journald[506]: Sent WATCHDOG=1 notification.
Steve
------------------------------------------------------------------------
Stephen L. Talbott https://urldefense.proofpoint.com/v2/url?u=https-3A__bwo.life_&d=DwIDaQ&c=gRgGjJ3BkIsb5y6s49QqsA&r=gd8BzeSQcySVxr0gDWSEbN-P-pgDXkdyCtaMqdCgPPdW1cyL5RIpaIYrCn8C5x2A&m=IPOXzXBtrCO_fXWWHvEYDEXPD_kUR28KBKMZtr2PiqA&s=61kPrfSHULQyKHHfU12Y5DQSyzmIyqTT-FIAul8FuJY&e=
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