> > Different computer but same cables i guess the device is ok. > But maybe the USB port of the computer is broken. > NTL I found that little gem: > https://www.fclose.com/linux-kernels/594677/usb-io_ti-add-heartbeat-to- > keep-idle-ep-416-ports-from-disconnecting-linux-4-3/ > > The behavior would fit (any way to check that the heartbeat is active ?). > Which kernel are you running on? use "uname -a" to get it. This patch was introduced in 4.3 kernel, not really hot ... And, yes, looks like what you experience. > Casten Schmidt ask me to look into > /sys/kernel/debug/dynamic_debug/control before i start to > debug the whole usb part, is that below expected behavior ? (i tried to find > what version of edgeport the driver suspects). > > drivers/usb/serial/io_ti.c:1507 [io_ti]do_boot_mode =_ "%s - STAYING IN BOOT MODE\012" ... > drivers/usb/serial/io_ti.c:884 [io_ti]i2c_type_bootmode =_ "%s - read 2 status error = %d\012" > That says that we have dynamic debug messages available for the driver. If you enable those by doing echo -n 'module io_ti =p' > /sys/kernel/debug/dynamic_debug/control Then you should see at least some of those messages appear in dmesg (kernel log). Best regards Carsten
