On Thu, Apr 9, 2009 at 4:05 PM, rvf16 <rvf16@xxxxxxxx> wrote: > Hello. > > I am trying to use two Terratec Cinergy Hybrid T USB XS FM tuners, at > the same time, on the same system. > Both work great when used solely. > When used simultaneously the second one gives the following error : > > v4l2: unable to open '/dev/video1': No space left on device > > I am using the em28xx-new-b2e841c05e94 driver from > http://mcentral.de/hg/~mrec/em28xx-new on a Fedora 6 system. > I have opened this topic in the em28xx mailing list > http://mcentral.de/pipermail/em28xx/ but it seems it is not maintained > any more. > hmm I'll check this there has been an update of the mailsystem on that box recently. > According to comments on relevant problems (the following is for spca5xx > driver for cameras with same problem) : > ----------------------- > When other USB devices are present on the same host controller bus as > the camera, the bandwidth requirements of the spca5xx driver are not > being met, with some hardware configurations. > The spca5xx driver is asking for more bandwidth than is available which > results in these error messages. > ----------------------- > > We are, under these circumstances, advised to either insert the device > in another USB socket or even install a PCI card with extra USB sockets > so that the device ends up in different bus. > I tried to insert the second device in another usb socket but it always > ends up at the same bus with the first one : > > #lsusb > Bus 005 Device 014: ID 0ccd:0072 TerraTec Electronic GmbH > Bus 005 Device 015: ID 0ccd:0072 TerraTec Electronic GmbH > Bus 005 Device 001: ID 0000:0000 Bus 002 Device 006: ID 046d:c50e > Logitech, Inc. MX-1000 Cordless Mouse Receiver > Bus 002 Device 001: ID 0000:0000 Bus 004 Device 001: ID 0000:0000 Bus > 003 Device 001: ID 0000:0000 Bus 001 Device 001: ID 0000:0000 > which happens to a lot of people from what i have seen. > > As this is a laptop with 4 USB sockets : > > # lspci | grep USB > 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #1 (rev 01) > 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #2 (rev 01) > 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #3 (rev 01) > 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI > #4 (rev 01) > 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI > Controller (rev 01) > > i cannot install a PCI card with extra USB sockets so there goes > workaround number two. > you can simply try to load the em28xx with alt=3 modprobe em28xx alt=3 as long as the bus is not fully utilized this should work fine! remember you only have 480 mbit; analog TV at least requires up to 170 mbit for 1 device. cheers, Markus > In spca5xx case a developer patched the driver so that the bandwidth was > throttled in such a way that two devices used simultaneously would never > exceed maximum. > > Can that be done with em28xx? > If not, is there any other workaround to this problem? > > Thank you. > Regards. > > > > _______________________________________________ > linux-dvb users mailing list > For V4L/DVB development, please use instead linux-media@xxxxxxxxxxxxxxx > linux-dvb@xxxxxxxxxxx > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb > -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
