On Thu, Aug 15, 2019 at 10:41:05AM +0200, Bjoern wrote: > Hi, > > > I'm running on Ubuntu Bionic 4.14.94-155 on an odroid-x4 (armhf). > > > I have a FT230X Basic UART (0403:6015) plugged into the exynos-ohci USB. The > device is linked via a udev rule to a "symbolic/virtual" device so that the > software FHEM can address it independent of the real ttyUSB* name. > > > I constantly see disconnects for the device in the kernel log, see log > excerpts below. I've found similar issues online going back till 2012 but > there seems to be no solution so far. I'd like to help find the cause if > possible. > > Regards, > Bjoern > > > Aug 4 11:25:11 fhem2 kernel: [2476586.963898] usb 2-1: USB disconnect, > device number 66 Your device removed itself from the system electronically, the other errors you report here are the kernel trying to clean up after itself. Try fixing the cable for the device, or the power provided to it, this is a physical issue, not a logical one that the kernel can help with, sorry. thanks, greg k-h
