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Rpi USB check-list

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Revision as of 14:17, 16 September 2012 by Elatllat (Talk | contribs)

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  1. 1A+ power supply
  2. low resistance power cable test
  3. powered USB hub 2 or less
  4. power Isolated USB cable link
  5. 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
  1. check and add your device to RPi_VerifiedPeripherals
  2. google search part of the bug report link
  3. 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