I've been noticing some issues which seemed to start happening after I left my 
machine alone for a while.  Eventually I thought I would try to nail the 
problem down and exclude some parties like kdebluetooth from the picture.  
What's left is quite reproducible.  It turns out that these periods of 
leaving the machine alone coincided with the times I removed the dongle to 
use it at work. :-)

System in healthy state:

raven root # hciconfig hci0 class
hci0:   Type: USB
        BD Address: 00:0B:0D:40:14:0D ACL MTU: 120:20  SCO MTU: 64:0
        Class: 0xff0104
        Service Classes: Positioning, Networking, Rendering, Capturing, Object 
Transfer, Audio, Telephony, Information
        Device Class: Computer, Desktop workstation

System after removing dongle:

raven root # hciconfig hci0 class
Can't get device info: No such device

System after replacing dongle:

raven root # hciconfig hci0 class
hci0:   Type: USB
        BD Address: 00:0B:0D:40:14:0D ACL MTU: 120:20  SCO MTU: 64:0
        Class: 0x000000
        Service Classes: Unspecified
        Device Class: Miscellaneous,

Now, the class has reset to 0x000000, but that's not the value I have in 
hcid.conf.

It also destroys my hostname value and probably everything else important at 
the same time, which would certainly explain why I suddenly can't connect ot 
the computer from any devices when it happens.

Any ideas on how I can stop this resetting?

TX

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