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Re: Intriguing issue

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David W. Hodgins <dwhodgins@nomail.afraid.org> wrote:
> From
> https://access.redhat.com/solutions/194273
> "This error indicates that USB 2.0 may not function on your system, or may function only at USB 1.1 speeds."

Good to see Redhat are following Microsoft in non-answer answers.

EHCI is the USB 2 host controller standard, so it's a problem with USB 2. 
But it doesn't say *why* it's a problem with USB2.  All the message tells us
is the USB stack got to a point where it got nothing sensible out of the
device and was forced to reset it.  It doesn't know why it got like that.

Typically that means either a cabling problem or a device-side problem (much
more likely than a 'replace the motherboard').

> See https://bbs.archlinux.org/viewtopic.php?id=89688 for disabling ehci-pci.

Disabling EHCI will force USB 1.1 speeds (12Mbps), but for most devices that
makes them useless.

It is likely to be a hardware side issue, so things like:
* Changing the cabling
* Remove or change any hubs
* Checking hub power supplies
* Check device firmware is up to date

would be worth trying.

One other thing is to try a USB 3.0 hub, assuming the port supports that. 
That (should) change the offboard communication to use USB 3 signalling (and
the XHCI host controller standard), which might not suffer an issue related
to something USB 2 specific.  If it doesn't work, at least it'll illuminate
the problem.

Theo

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Intriguing issue "James H. Markowitz" <noone@nowhere.net> - 2023-01-09 20:17 +0000
  Re: Intriguing issue Marco Moock <mo01@posteo.de> - 2023-01-09 21:36 +0100
  Re: Intriguing issue mjb@signal11.invalid (Mike) - 2023-01-10 20:57 +0000
  Re: Intriguing issue Theo <theom+news@chiark.greenend.org.uk> - 2023-01-11 22:23 +0000
    Re: Intriguing issue "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2023-01-11 18:31 -0500
      Re: Intriguing issue "James H. Markowitz" <noone@nowhere.net> - 2023-01-12 19:21 +0000
        Re: Intriguing issue "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2023-01-12 18:32 -0500
          Re: Intriguing issue "James H. Markowitz" <noone@nowhere.net> - 2023-01-13 15:03 +0000
            Re: Intriguing issue "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2023-01-13 16:23 -0500
      Re: Intriguing issue Theo <theom+news@chiark.greenend.org.uk> - 2023-01-13 12:51 +0000
  Re: Intriguing issue "James H. Markowitz" <noone@nowhere.net> - 2023-01-14 20:04 +0000
    Re: Intriguing issue Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2023-01-15 09:17 +0000
      Re: Intriguing issue "James H. Markowitz" <noone@nowhere.net> - 2023-01-15 13:36 +0000
        Re: Intriguing issue Henrik Carlqvist <Henrik.Carlqvist@deadspam.com> - 2023-01-16 07:14 +0000
          Re: Intriguing issue Andrew <Doug@hyperspace.vogon.gov> - 2023-01-16 10:06 +0100
            Re: Intriguing issue Eric Pozharski <whynot@pozharski.name> - 2023-01-16 15:00 +0000
              Re: Intriguing issue John-Paul Stewart <jpstewart@personalprojects.net> - 2023-01-16 15:28 -0500
            Re: Intriguing issue "Carlos E.R." <robin_listas@es.invalid> - 2023-01-16 20:47 +0100
              Re: Intriguing issue "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2023-01-16 17:08 -0500
      Re: Intriguing issue "Carlos E. R." <robin_listas@es.invalid> - 2024-11-08 13:57 +0100

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