Re: [pwc] pwc pwc_isoc_handler() called with status -84

Ok, i have found a solution for my problem. If I stop the powersave 
damon (rcpowersaved stop in Suse) everything works fine again. Obviously 
if the powersave damon wants to change CPU frequency the UHCI controller 
is not happy about it. I can also reproduce this with the cpufreq utils. 
 So I do not think its a problem of the PWC driver which works perfect now.
kirus

 wrote:
> 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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