Hay, I checked the quickcam driver, with this driver the problem is not (!!!) present.
Rest of the configuration did not change (only the webcam of cause)! Detlef ----- Original Message ----- From: "Detlef Schmicker (Siebertz Electronic GmbH)" <[EMAIL PROTECTED]> To: "Rob van Nieuwkerk" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Friday, July 04, 2003 4:02 PM Subject: Re: [linux-usb-devel] pwc stops if the system is loaded > Hoi Rob, > > yes you are right. I use a hard disk in PIO mode. I will use a flash disk > also. > > I can reproduce the problem the same way as you can. > > I think it is probably in the USB layer, but I am not sure, if the pwc could > not handle > the problem better than it does. I must not reload the pwc driver, I can > restart my application > and the cam is up again. > > Do you have experience with other webcams on the same system? > > How can we attack the problem. > > Detlef > > ----- Original Message ----- > From: "Rob van Nieuwkerk" <[EMAIL PROTECTED]> > To: "Detlef Schmicker (Siebertz Electronic GmbH)" > <[EMAIL PROTECTED]> > Cc: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> > Sent: Friday, July 04, 2003 1:20 PM > Subject: Re: [linux-usb-devel] pwc stops if the system is loaded > > > > > Hello, > > > > > > Kernel 2.4.20, 300MHz Goede GX1 CPU, OHCI USB > > > > > > I use pwc without compressor module and with Jave Media Framework > > > > > > If I load the system by loading a "big (500k)" file with vi, than the > webcam > > > stops. > > > > > > Sometimes I get a message in /var/log/messages: > > > Jul 4 17:01:38 linux kernel: pwc Iso frame 0 of USB has error -18 > > > > > > > > > but often I do not get any unusual message, but I have a stoped webcam. > > > > Hi Detlef, > > > > I have a similar problem: I found out that accessing a CompactFlash > > in PIO mode to much will cause the pwc to stop working. It usually > > gives this kernel message: > > > > "pwc_isoc_handler() called with status -75 [Babble (bad cable?)]" > > > > The user process accessing the camera never returns from read(). > > Only removing the driver modules and re-inserting them will "solve" > > the problem. (this is not a solution because reloading en initializing > > the camera driver takes many seconds: I'm building a real-time image > > processing application). > > > > The problem can be triggered instantaneously by doing a: > > > > cat /dev/hda > /dev/null > > > > I'm not sure but I suspect that the problem is in the USB layer and > > not in the Philips webcam driver. > > > > Are you using CF too, or an other disk in PIO mode ? > > > > PIO mode access will generate quite some CPU load in kernel mode, > > it seems that the kernel doesn't serve the USB stuff fast enough. > > In my application I don't care if some frames get lost or damaged. > > But the halting of the camera is not acceptable. > > > > greetings, > > Rob van Nieuwkerk > > > > Sysinfo: > > -------- > > 300MHz Geode GX1 (= Pentium compatible CPU) > > various 2.4.x kernels > > PCVC740K webcam > > pwc compressor > > OHCI > > > > > > ------------------------------------------------------- > > This SF.Net email sponsored by: Free pre-built ASP.NET sites including > > Data Reports, E-commerce, Portals, and Forums are available now. > > Download today and enter to win an XBOX or Visual Studio .NET. > > http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 > > _______________________________________________ > > [EMAIL PROTECTED] > > To unsubscribe, use the last form field at: > > https://lists.sourceforge.net/lists/listinfo/linux-usb-devel > > > > > > ------------------------------------------------------- > This SF.Net email sponsored by: Free pre-built ASP.NET sites including > Data Reports, E-commerce, Portals, and Forums are available now. > Download today and enter to win an XBOX or Visual Studio .NET. > http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 > _______________________________________________ > [EMAIL PROTECTED] > To unsubscribe, use the last form field at: > https://lists.sourceforge.net/lists/listinfo/linux-usb-devel > ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
