On Sun, 6 Feb 2005, Jason Grant wrote:

> On Sat, 2005-02-05 at 08:18 -0800, Stephen J. Gowdy wrote:
> > BTW, beyond what Alan said, being in usb.ids doesn't mean it is supported.
> > 
> 
> Yes, I was fumbling around trying to work out how the various versions
> of usb.ids correlated with kernel versions, but no luck.  It isn't
> tracked in the file, nor in CVS.  
> 
> Back to my original question, is there a way for me to determine which
> IDs my kernel supports?

Basically no.  You can find out some that aren't supported (although the 
online device lists tend to lag a bit behind the state of kernel 
development, and it may be that a device listed as unsupported now 
actually does work).

Sometimes supported devices stop working, as a result of a problem
introduced by a change to the kernel.  There's no easy way to know when
that will happen because the kernel developers don't have examples of
every possible type of device and couldn't test them all even if they did.

It also happens quite frequently that a device is supported but doesn't 
work on one particular computer because of hardware bugs.  Obviously 
it's impossible to predict when that will happen, although certain classes 
of bugs can sometimes be identified (like when a particular vendor's 
motherboard has a known problem).  But this means that sometimes even 
supported devices don't work.

Alan Stern



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