[TheMooch]

So I tried calibre-debug -d and here's what I get (I've diabled plugins for everything except Sony and Kindle btw):

[monty@localhost ~]$ calibre-debug -d
USB devices on system: [(16700, 33093, 256), (7531, 2, 518), (7531, 1, 518), (1356, 798, 554), (7531, 1, 518), (7531, 1, 518), (7531, 1, 518), (2652, 17667, 256), (2652, 17666, 256), (16700, 33062, 256), (2652, 17664, 256), (7531, 1, 518), (1452, 4754, 1), (1447, 4128, 256), (1118, 1885, 256), (1293, 567, 7), (1293, 567, 7), (7531, 2, 518), (1033, 90, 256)]
Looking for KINDLE
Looking for KINDLE2
Looking for KINDLE_DX
Looking for PRS500
Looking for PRS505
Looking for PRS700

So it's not being detected at all.

I can mount the device using:

pmount /dev/sdb

Unfortunately it makes zero difference.