Re: USB issues in fedora-27 ("can't get device qualifier: Resource temporarily unavailable") not happening when booted into CentOS-6.2, same hardware

[Tom Hodder]

On 30 March 2018 at 04:15, Ed Greshko <ed.greshko(a)greshko.com&gt; wrote:

>  The error above is being reported by the uvcvideo module which is part of
>  the
>  kernel.  For informational and debugging information the first thing I
>  would do is
>  determine what kernel version is in used for Centos 6.2  v.s. F27.  I'm
>  pretty sure
>  they are quite different.
>  
The fedora box is;
$ uname -r
*4.15.13-300*.fc27.x86_64

and the centos 6.2 is reporting;
*2.6.32-220*.el6.x86_64

>  The error above is being reported by the uvcvideo module which is
> part of 
the kernel.

I am getting those errors ("can't get device qualifier: Resource
temporarily unavailable") , whether the webcam is plugged in or not, which
seems to be a more fundamental problem. I only noticed it when trying to
get this particular webcam working.

>  As I mentioned above you should find the kernel version of CentOS 6.2
> and 
potentially
>  boot a live Fedora with a similar kernel 
I booted a fedora-15 liveCD (kernel 2.6.38.6-26.rc1.fc15.x86_64), and I am
not seeing any errors (Resource temporarily unavailable ), but none of the
webcams I tried work (I tried 3, 2 of which work correctly on f-27 on this
hardware)

I guess I am most concerned about the (Resource temporarily unavailable )
which would seem to be separate from the webcam issue, lsusb has only the
mouse and the keyboard....

...no webcam plugged in .... But still lots of errors in the output;

# lsusb -v  2>&1  | grep -C2  "Resource temporarily unavailable"
     bAlternateSetting       0
     bNumEndpoints           1
     bInterfaceClass         3 Human Interface Dcan't get device
qualifier: Resource
temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
can't get debug descriptor: Resource temporarily unavailable
...


I've tried swapping out the mouse and they keyboard with others, but those
errors remain..


>  Then, I would also check the actual make/model of the webcam and see
> if
>  there have
>  been any firmware updates to the camera.
>  

So I've got a new webcam which is working, and I'm happy to scrap that old
webcam as broken, but I'd like to fix those errors that occur in the lsusb
output....

Cheers,
Tom