On Mo, 2018-08-13 at 18:44 +0530, Muni Sekhar wrote: > [ Please keep me in CC as I'm not subscribed to the list] > > Hello All, > > I’ve a FTDI serial device and it is not recognized if I connect > directly to computer. However if I connect via an external USB hub > it’s fine and I can see the FTDI serial device. What could be the > issue and how to resolve this? > > > Also one more behaviour, when I ran “lsusb” it hangs forever and ‘ps’ > command output shows the state as “Dl+”. Any reasons for this > behaviour? Impossible to tell. Switch on dynamic debugging for usbcore and your hcd's driver and post dmesg. Sysrq-T during the hang would also help. Regards Oliver
