05-27-2009
Solved by restarting HAL
I just had this same issue on Ubuntu 9.04. My USB thumb drive was automounting correctly all day, and I made sure to unmount (eject) before removing it every time, but for whatever reason, it suddenly stopped mounting when I plugged it in.
Thanks to the links provided by techlinux, I learned a bit about HAL, and running "ps aux | grep hal" turned up a line like this:
hald-addon-storage: no polling because /dev/sdc is locked via HAL
With the usb drive unplugged, I restarted HAL, and that fixed the problem, hooray. However, the command is slightly different than specified in the HAL wiki. /etc/rc.d/hal doesn't exist (in fact, /etc/rc.d doesn't exist). This is the command I used:
sudo /etc/init.d/hal restart
Now.. how do we figure out what causes the polling/locked problem in the first place?
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LSHAL(1) General Commands Manual LSHAL(1)
NAME
lshal - list HAL devices
SYNOPSIS
lshal [options]
DESCRIPTION
lshal is a utility for displaying items in the HAL device database. For more information about both the big picture and specific HAL prop-
erties, refer to the HAL spec which can be found in /usr/local/share/doc/hal/spec/hal-spec.html depending on the distribution.
OPTIONS
The following options are supported:
-m, --monitor
Print changes emitted by the hald daemon.
-s, --short
Short output.
-t, --tree
Display the devices organized in a tree.
-u, --show
Show only the given UDI (Unique Device Identifier).
-h, --help
Print out usage.
-V, --version
Print the version.
BUGS
Please send bug reports to either the distribution or the HAL mailing list, see http://lists.freedesktop.org/mailman/listinfo/hal on how to
subscribe.
SEE ALSO
hald(8), hal-get-property(1), hal-set-property(1), hal-find-by-property(1), hal-find-by-capability(1)
AUTHOR
Written by David Zeuthen <david@fubar.dk> with a lot of help from many others.
LSHAL(1)