# cat /sys/bus/usb/devices/usb[12]/version 2.00 2.00
# cat /sys/bus/usb/devices/usb[12]/product EHCI Host Controller EHCI Host Controller
# cat /sys/bus/usb/devices/usb[12]/manufacturer Linux 5.0.2 ehci_hcd Linux 5.0.2 ehci_hcd
# cat /sys/bus/usb/devices/usb[12]/speed 480 480
What other information do you need ?
Do you suggest some particular USB module configuration to try ?
Regards,
Guido
Il 22 marzo 2019 alle 15.06 Clemens Ladisch clemens@ladisch.de ha scritto:
Guido Trentalancia wrote:
Also, the hardware is the same: Hercules P32 DJ (with exactly the same firmware version 1.46 which is the latest).
Are the USB controllers the same (2.0/3.x, OHCI/UHCI/EHCI/xHCI)?
You wrote that "amidi -p hw:2,0,0 -d" causes the problem. As long as no MIDI messages are actually received, the kernel or driver cannot affect what happens on the USB bus; the polling is done entirely by the host controller.
Regards, Clemens