What is wrong with FreeBSD and USB Support

Hans Petter Selasky hps at selasky.org
Mon Mar 6 10:35:40 UTC 2017

On 03/06/17 11:00, Markus Rechberger wrote:
> even though it's going up and down DVB-T is okay due to the lower
> bandwidth so something's obviously wrong with the freebsd USB Support.


Can you provide a usbdump trace and send it to me off-list?

usbdump -i usbusX -f Y -s65536 -w usb_capture.pcap

X and Y are number after ugenX.Y

If you are using ISOCHRONOUS high-speed transfers with an XHCI USB 
controller, the XHCI is much less forgiving about the USB PIDs of the 
multi-data payloads coming from the USB device than the EHCI. I have 
seen at least one DVB-T USB adapter which is totally broken with XHCI 
and works just fine with EHCI. This has been verified with a USB wire 


More information about the freebsd-multimedia mailing list