On Sun, Aug 14, 2005 at 08:30:44PM +0200, wrote:
> I am using the Philips PCVC 740 with Suse kernel-of-the-day 2.6.13-rc6
> and PWC driver 10.0.7a. I get a lot of
> of below messages messing up my syslog. I get this messages using
> messages per second is CPU load dependent. If a run motion alone I get
> ...
> However the Camstream and Motion outputs look fine.
>
> Do other people have the same experience?
Yes, lots. I cannot really use Quickcam 4000 for a long time periods until it
(the driver) always finally gets "broken" and I have to restart the
application. Before also this caused kernel Oops in the USB audio driver
and also killed PS/2-keyboard ans serial-mouse, but those bugs seem to
have been fixed now in the latests kernels.
See
http://bugzilla.kernel.org/show_bug.cgi?id=4510
Now when pwc driver fails, after application is quit, pwc driver is
reloaded and video-device could be opened again.
> Is this a PWC driver problem or general USB kernel problem with
> isochronous pipes?
I have a theory, it could be because the decompression in the pwc driver
needs too much CPU power compared what my PC platform can provide when
there is a >1.0 load. The driver cannot keep up with the CPU power it
has been given and eventually lower level USB drivers call it quit.
As I exlain in the bug report, I remember it working for days without
errors, but I cannot remember with what kernel and driver combination it
was then. At least from year 2003 (... /motion/old/2003/12/30/ )
I have motion video logs which continued for days.
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