Good news, I found the real problem and the fix :)

I finally found out it's not the hub but the laptop usb port/controller,
as I plugged directly the intuos3 tablet on it and it still didn't work
(I should have tried this from the beginning, shame on me.. )

I've identified my usb controller and the driver used, and found this bug 
related to same hardware:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1072918

So I've tried a mainline kernel with this patch:
https://lkml.org/lkml/2013/2/18/115

Now it works perfectly :D

(note that I'm using Manjaro since a few days, so I can't test anymore
on Raring alpha for now, but as I could reproduce the problem exactly I
guess the fix will apply here too)

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https://bugs.launchpad.net/bugs/1120472

Title:
  regression: D-link DUB-H7 usb hub

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