- 5VDC 1A+ power supply
- low resistance power cable test
- powered USB hub 2 or less
- power Isolated USB cable link
- There are some known known bugs with the usb driver, try:
rpi-update
smsc95xx.turbo_mode=N in /boot/cmdline.txt
dwc_otg.microframe_schedule=1 in /boot/cmdline.txt
vm.min_free_kbytes=16384 in /etc/sysctl.conf
reboot
- check and add your device to RPi_VerifiedPeripherals
- google search part of the bug report link
- bug report:
rm /var/log/kern.log /var/log/kern.log.1 /var/log/kern.log.*.gz
shutdown -r now
##make the error happen
lsusb -v | grep -iP "Transfer Type.*(Interrupt|Isochronous)" | wc -l
cat /var/log/kern.log | grep -iP "fail|warn|error" | perl -p -e 's/^[^\]\n]*\]//g;s/(warn_alloc_failed: )[0-9]+/$1/g' | sort -u;
dmesg