On Tue, Jul 03, 2018 at 01:18:57PM +0200, Benjamin Herwig wrote:
I encountered some strange USB behaviour (also others on the internet, for example https://www.linuxquestions.org/questions/linux-hardware-18/what-does-cdc_acm-unknown-symbol-refcount_inc_not_zero-err-0-in-dmesg-mean-4175633136/)Attaching an Arduino to my computer gives an errormessage (cdc_acm: Unknown symbol refcount_inc_not_zero (err 0)) and no /dev/ttyACM* is bound.
Have you rebooted since your last kernel upgrade? Mike Stone