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Re: What is "discover -t" saying?




On 2018-06-24 at 10:51, Richard Owlett wrote:

> On 06/24/2018 09:35 AM, The Wanderer wrote:
>
>> On 2018-06-24 at 10:07, Richard Owlett wrote:

>>> discover --vendor-id --model-id -t | grep unknown
>>> gives
>>> 1912 0015 unknown unknown
>> 
>> https://pci-ids.ucw.cz/read/PC/1912/0015
>> 
>> This would appear to be a USB3 controller device. (Unless that's
>> actually a USB ID, and the PCI ID match is a false positive; I've never
>> seen that happen, but I don't know if it can be ruled out.)
>> 
>>> 1bbb 0195 unknown unknown
>> 
>> https://usb-ids.gowdy.us/read/UD/1bbb/0195
>> (although that site appears to be down at the moment).
>> 
>> For some reason this doesn't seem to be listed in the main usb.ids file
>> hosted at usb-ids.ucw.cz; however, the vendor ID is listed there, as 'T
>> & A Mobile Phones'. Based on the two devices listed under that vendor
>> ID, that appears to be Alcatel.
>> 
> 
> Thank you. I'm interested in only:
> Prolific Technology, Inc. PL25A1 Host-Host Bridge

In that case, I'm not sure what the question is.

Your original question seemed to be "what does the 'unknown unknown' at
the end of this line mean?", and we've determined that that was based on
a false premise; that isn't at the end of the given line, it's a line of
its own.

We've also figured out what that "line of its own" means, and what the
device it's based on probably is.

What is it you want to know about the Prolific Technology device?

All I can say about it is that it's another example of a "vendor model"
line, where the "vendor" appears to be "Prolific Technology, Inc." and
the "model" appears to be "PL25A1 Host-Host Bridge".

As I've never heard of this device before, and its name would seem to
indicate that it's an internal system component that's unlikely to be of
much interest unless something related to it is malfunctioning, I'm not
sure where you want to go from there.

What is your actual question, here?

> I'm missing understanding of "something" everyone takes for granted.
> 
> While following chain of links I found "discover -t".
> I suspect my problems understanding this is closely related to "Why 
> doesn't connecting the cable "Just Work"? Every other USB device I've 
> ever used does. There some fundamental detail missing.

What cable? Your original question in this thread didn't have anything
to do with a cable, or indeed mention USB at all.

I could guess that maybe your system doesn't have a driver that (knows
that it) works with the USB3 controller device mentioned above, and that
as a result connecting a device to a USB port which is fed by that
controller doesn't make it possible for the system to talk to that device.

But that would be only a guess, and it wouldn't seem to have anything to
do with the Prolific Technology device.

-- 
   The Wanderer

The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore all
progress depends on the unreasonable man.         -- George Bernard Shaw

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