Enabling debug logs for Telepathy
When there are certain kinds of problems with collaboration on the XO, it is useful to developers to have log files for debugging purposes. Here is how to enable these log files.
If you haven't already seen Attaching Sugar logs to tickets, see that page first to create a /home/olpc/.xsession file.
- Edit .xsession and uncomment the lines about GABBLE_DEBUG, GABBLE_LOGFILE, SALUT_DEBUG, SALUT_LOGFILE, PRESENCESERVICE_DEBUG and SUGAR_LOGGER_LEVEL by removing the initial '#' character
- For debugging lower level problems in the Telepathy connection managers, enable LM_DEBUG (for telepathy-gabble) or GIBBER_DEBUG (for telepathy-salut). Note that these will produce much bigger log files.
Telepathy log files are now available in /home/olpc/.sugar/default/logs/. Be sure to attach presenceservice.log, telepathy-gabble.log and telepathy-salut.log if you submit a ticket about a Telepathy issue.
 Capturing core files
Core files are produced when a program crashes and contain useful debugging information. By default, core files are disabled on the XO. Here is how to enable them.
- As root:
echo /tmp/core-%p-%e > /proc/sys/kernel/core_pattern
- This tells the kernel to put core files into the /tmp directory. This will only be effective until the laptop is rebooted. To make it persistent across reboots, add the following line to /etc/sysctl.conf:
kernel.core_pattern = /tmp/core-%p-%e
- Add the following line to /home/olpc/.xsession:
ulimit -c unlimited
This turns off any limit on core file size.
 Debugging scenarios
- no presence seen on (or of) other machines/laptops
- activity was shared but doesn't appear on other laptops
- invitation was sent but not received
- other sharing problems