I have absolutely the same symptoms being described here too. This has
started happening after a very recent update.
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High CPU Consumption
https://bugs.launchpad.net/bugs/215728
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I can also confirm this regression. Sony A818 walkman worked perfectly
in Gutsy, but is not auto-mounting in Hardy. This is a shame, because
this is a drag-and-drop player, so is perfect for Linux.
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Regression: Sony Walkman NWZ-S618F doesn't mount in Hardy