Messages in this thread | | | Date | Fri, 08 Mar 2002 22:03:57 +0100 | From | Thomas Winischhofer <> | Subject | Re: pwc-webcam attached to usb-ohci card blocks on read() indefinitely. |
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> The camera attached to the UHCI-controller running usb-uhci works just > fine,out the three attached to the OHCI-controllers running usb-ohci don't. > After a random amount of frames being read from a camera the read()-call > blocks indefinitely until the device is closed. Next time the v4l-device is > opened the program can again read frames from the camera but read() always > blocks after some time.
I can't help, but I have the exact same problem here. Closing the application (eg. camstream) and re-opening it makes it work again for a while.
As Carl-Johan said, this happens with or without the pwcx module, so that's not the problem.
I think it's an ohci problem.
Furthermore, the usb driver(s) behave strangely on connecting/disconnecting the camera. Sometimes this works flawlessly, sometimes I get a lot of USB timeout ("usb_control/bulk_msg: timeout") and/or "USBDEVFS_CONTROL failed dev x rqt 128 rq 6 len 490 ret -110" messages in the syslog. (Kernel is 2.4.16 and 2.4.18 - no difference) After a couple of times disconnecting and reconnecting the camera it's being detected. Since 2.4.18, the camera's LED sometimes is on, sometimes off - seems quite random.
Even closing the cam application (xawtv, camstream) after the camera stopped working never results in any error messages in the log, I only read "pwc: Closing video device: xxx frames received, dumped 0 frames, 0 frames with errors"
Thomas
-- Thomas Winischhofer Vienna/Austria mailto:tw@webit.com *** http://www.webit.com/tw - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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