@Aless

Thanks for testing!

> Hey, I just tried again after I pulled the new upstream

The log doesn't look like it's from from the latest. Sorry, stupid
question: did you rebuild after pulling? Not that it would fix the busy
problem (I'd be surprised if it did). Unfortunately...

> it never succeeded, no matter how much I tried to repeat the exact
same movement

Can't say for sure, but just seeing from the logs most of the time the
scanned image appears to be not so good. The assembled height is quite
low. Not enough movement?

> this is more of an issue relating to the hardware, it would be nice to
instruct it to shutdown after use as well

I really don't know what it's related to. I think your 0903 used to work ok for 
people earlier. Although I don't have any reports where it did and then didn't, 
so could be a combination of factors.
The driver is unconditionally sending a shutdown command (what seems to be the 
closest thing) but the problem is, I don't think the reader responds to it. 
Because it's stuck.
Can I ask you to do an experiment (more like a shot in the dark)? It looks like 
the problem only occurs on enroll. Can you please try running img_capture like 
20 times in a row and see if it fails at some point?

> Would there be a way to store all the frames separately

Not without a small hack. I can send you a patch if you want.

> entire fingerprint is scanned from all angles and stitched in a nice
way, so that the fingerprint can then be verified over a smaller area by
just touching the sensor

Unfortunately, it's not that "simple". Long story short, even with
perfect stitching, you'd need to scan and assemble the entire print on
each verification. I believe win (and smartphones etc) use an entirely
different *comparison* algo.

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https://bugs.launchpad.net/bugs/1641290

Title:
  [04f3:0903] Elan Microelectronics Corp fingerprint reader not
  recognised

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