debug

dmesg

watch "dmesg | tail -20"

Notfications of Kernel ringbuffer

hcidump

Debug bluetooth traffic (traffic sniffer)

watch

displays output of either log or application periodically

cat /proc/partitions

if device is not listed

/var/log/Xorg.0.log

X debug output

/var/log/messages

General system messages

.. to be continued

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