Difference between revisions of "Rpi USB check-list"
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− | # 1A+ power supply | + | # 5VDC 1A+ power supply |
# low resistance power cable [http://elinux.org/R-Pi_Troubleshooting#Troubleshooting_power_problems test] | # low resistance power cable [http://elinux.org/R-Pi_Troubleshooting#Troubleshooting_power_problems test] | ||
# powered USB hub [http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=13858&p=146421#p146421 2 or less] | # powered USB hub [http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=13858&p=146421#p146421 2 or less] |
Latest revision as of 22:38, 2 December 2012
- 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