Hello!  First, please let me congratulate all of you on your persistent
troubleshooting efforts.  I recently picked up an Acer Spin 5, which has
a newer ELAN unit in it, so I thought I'd see if I could help.  I use
this system primarily for software development under Fedora 28, so I
should be in a good position to help test the hardware, if not the
Ubuntu-specific login process.

The unit in this laptop enumerates as:
Bus 001 Device 003: ID 04f3:25a1 Elan Microelectronics Corp.

I have installed code from GitHub, current as of today.  Without even
adding the model to the driver, the test program properly read and
verified a print, at least some of the time.  There are issues but the
point is it worked at least once, using the test utilities.

I added the 25a1 model code to the driver list, and installed, but as
yet, fprintd-enroll still fails:

[mheck@localhost ~]$ fprintd-enroll 
list_devices failed: No devices available
[mheck@localhost ~]$ sudo fprintd-enroll 
[sudo] password for mheck: 
list_devices failed: No devices available

I'm not sure what's going on with that, but in any case, the model
number "25a1" seems supportable, since it works with the standalone test
programs, and should probably be added to the model list.

Anything else I can do to help add support for that particular model?
Seems to be recent, but deliberately backward compatible.

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

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