"Victoria W." wrote: > > hi all, > > I'm using usb-cams since a long time. I'm shure, I had tested to use 2 > cams at the same time several months ago - and they were working fine. > > But now (kernel 2.4.9 and 2.4.14) on 2 different PCs with a different > hardware, the following happens, if I try to access 2 cams at the same > time: > > -------------------------------------------------- > kernel: pwc Adding decompressor for model 740. > kernel: pwc pwc_isoc_handler() called with status -84 [CRC/Timeout]. > kernel: pwc pwc_isoc_handler() called with status -84 [CRC/Timeout]. > kernel: hub.c: port 1 enable change, status 101 > kernel: hub.c: already running port 1 disabled by hub (EMI?), > re-enabling... > kernel: hub.c: port 1, portstatus 101, change 2, 12 Mb/s > kernel: usb.c: USB disconnect on device 2 > kernel: pwc Disconnected while device/video is open! > kernel: pwc pwc_isoc_handler() called with status -84 [CRC/Timeout]. > last message repeated 3001 times > --------------------------------------------------- > the message: > kernel: hub.c: already running port 1 disabled by hub (EMI?), > re-enabling... > > always appears, if I access the second cam. One of the cams is locked > then. (it hangs on ioctl-VIDIOSYNC) > > It does not matter, what kind of cam I use. (I've tried pwc and ov511) > If I stop one of the reading-processes, the other cam then starts to work > again. > > I am shure, it's n cable-problem..... > > Any hint or ideas ? > > best regards > > wicki :*)
Hi Wicki, we had the same error message just one day ago. We lost a whole day to solve this problem, but we found the reason. Therefore my question: What kind of clothes were you wearing, when you plug in the second cam? Yes, its a silly question. But I was wearing a synthetic fleece shirt and every time I stand up and push the start buttons on our devices we got this message. We checked and changed our driver module and our firmware, but nothing happened. Just in the later afternoon when I stand up and do not push the start button but took my cup of tea, we understood the problem. It was not the starting of the device, it was the standing up ;-) We used four usb hubs from D-Link that are obviously sensible against EMI. Now we use a different ones and we have no problem any longer. Best regards Joerg _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
