> I suppose this points to defect HW?

Yes.

> How easy are these things to break?

Ports which adhere to the old IEEE 1394:1995 specification are
electrically more prone to damage during hotplugging than later
1394a:2000 hardware.  And the 4-pin iLink ports are mechanically not
very reliable.  Damaged 6-pin 1394a ports or 9-pin 1394b ports on the
other hand are not very common but do occasionally happen.

> Will try older Ubuntu later.

If you have the opportunity, please do so.  A driver regression is
unlikely to be the cause of this problem but it would be good if you
could test with older firewire-ohci + firewire-core kernel drivers, or
ideally with the ohci1394 + ieee1394 + raw1394 kernel drivers of kernel
2.6.36 or older to be sure.

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https://bugs.launchpad.net/bugs/1045047

Title:
  Firewire camera is not recognized

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