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.
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 : Bus 002 Device 006: ID 046d:c50e
Logitech, Inc. MX-1000 Cordless Mouse Receiver
Bus 002 Device 001: ID : Bus 004 Device 001: ID : Bus
003 Device 001: ID : Bus 001 Device 001: ID :
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.
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.
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