Re: EHCI reports message "lost IAA" (fwd)

On Sat, 8 Dec 2007, Dr. Peer Griebel wrote:

> Dear USB developers
> 
> some time ago (3/4 year) I already reported my problem with the EHCI
> driver.  There was no response to it.  I would like to tell you that my
> problem still persists.  I just tried it today using the current Gentoo
> kernel 2.6.23-gentoo-r3.
> 
> There don't seem to be many people with this problem and it is not very
> urgent for me to get it resolved.  But I do think that this problem
> should be resolved.  It is not very easy to find out that there are
> "lost IAA" messages since only the debug version of the driver shows the
> message.  The average user doesn't know about the debug version.  The
> everage user only sees that his web cam does not work.
> 
> I'm a software developer myself.  But I don't know very much about USB.
>  I would be very glad if I can help you in any way to resolve my problem.
> 
> Thank you very much,
> Peer
> 
> 
> Alan Stern schrieb:
> > ---------- Forwarded message ----------
> > Date: Tue, 06 Mar 2007 22:00:39 +0100
> > From: Peer Griebel <[email protected]>
> > To: [email protected]
> > Subject: [Linux-usb-users] EHCI reports message "lost IAA"
> > 
> > Dear USB developers,
> > 
> > Sam Revitch is currently developing a driver for Ricoh webcams with id 05ca:1870.  (See: http://lsb.blogdns.net/ry5u870). I'm testing the results.  Everything looks very good - driver wise.
> > 
> > But the problem I'm facing is that my laptop only is able to use the webcam directly after boot or after reloading the module ehci-hcd. After some time (some minutes?) the webcam isn't usable any longer.
> > 
> > After further investigation I discovered that the the unresponsive driver goes into the state "lost IAA".  These messages are not generated when the driver is correctly working.  I can reprocude this in 2.6.18-gentoo-r2 and 2.6.20-gentoo.

There have been other reports of similar problems with NVidia EHCI 
controllers.  Nobody has any idea what's wrong with them or how to fix 
the problem.  If you have any suggestions, I'd be glad to hear them.

Can you post your debugging log messages?

Alan Stern


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