Troubleshooting
Guides
- Troubleshooting Guide by Raspberry Pi
- Troubleshooting Guide by eLinux
- Boot Problems Troubleshooting
- How to get the IP-Address of a RPi
- Root user infos
Login and Password
The default login user is pi and the password is raspberry.
Note, on an English keyboard layout Y and Z are swapped on German keyboards.
Linux Kernel Version
Command: uname -a
Power Supply Issues
The Raspberry Pi will show (on the HDMI output) a small rainbow square in the upper right corner, when an under voltage is detected (check Power FAQ).
The first revisions of the Raspberry Pi have Polyfuses F1+F2 on the USB-A ports which limit the current. In later revisions these fuses were replaced by 0 ohm jumpers. However there is still a Polyfuse F1 on the bottom side under the micro USB power port. When powering the board via this port and a high current is drawn then the voltage drop through the fuse can get to high and problems can occur.
Polyfuse
Disable USB+LAN (LAN9512/LAN9514)
Depending on the system USB+LAN can be deactivated/activated with the following commands:
$ echo 0 > /sys/devices/platform/bcm2708_usb/buspower
$ echo 1 > /sys/devices/platform/bcm2708_usb/buspower
or
$ echo 0 > /sys/devices/platform/soc/3f980000.usb/buspower
$ echo 1 > /sys/devices/platform/soc/3f980000.usb/buspower
If you do not have the permission, then run it with sudo, e.g. $ sudo bash -c 'echo 0 > /sys/devices/platform/bcm2708_usb/buspower'