05-08-2018 05:53 PM
I have a similar complaint about my own ThinkPad T580. I wouldn't say that the fingerprint is forgotten, but it seems to reject my fingerprint too much. It just doesn't work as well as it should.
However, there is a newer version of fingerprint driver that seems to be a lot better. Maybe not perfect yet, but the improvement was very noticible for me.
How to get it:
1. open Device Manager
2. expand the Biometric Devices category, then right-click on "Synaptics WBDI ..."
3. in the menu, click on "Update driver"
4. select the option about "Search automatically for updated driver software"
5. Windows should automatically download and install a new driver
6. after installation complete, double-click on the device in Device Manager, then open the "driver" tab to verify that driver version 5.3.3521.26 is installed
7. reboot and see if you think the situation is better.
05-08-2018 06:39 PM
Hi someotherguy, nice to see you on this thread too!
(BTW, can you please clue me in to how you @ someone, because it never links when I do it. I cannot figure it out in this forum software.)
Anyways, I followed your instructions and it did indeed find a newer driver. I will give it a try -- I'm quite suspicious that this would actually help due to this being a MOS device -- Match On Sensor -- so it seems like a firmware update would be necessary. But let's see how it goes...
05-08-2018 07:24 PM
I have no idea about forum logistics like tagging someone. There's a dedicated forum housekeeping board, I think it would be a good topic in that board. Hopefully a moderator can give you a pointer. https://forums.lenovo.com/t5/Forum-Housekeeping/bd-p/Forum_housekeeping
Although the device is match-on-chip, the driver configures the matching algorithm on the chip, including parameters such as FAR (false acceptance rate) and FRR (false rejection rate). In fingerprint world, this is always a balancing act between security and usability. You want to be sufficiently confident that the finger is a match to what was originally enrolled, but you don't want to require such a perfect match that you reject the same finger that is scanned at a different pressure, offset, angle, etc. In my opinion, the problem is caused by mistuned parameters, and can definitely be fixed by a driver update.
If you think the new driver is not an improvement after a couple days of trying it, let me know and we will discuss next steps.
05-08-2018 07:39 PM
Hah, I've seen you @ people and have the names turn into links, so whatever you're doing just doesn't work when I type @someotherguy
Anyways, thanks for the info on the sensor. Given the usage of SGX and thus the expected trust chain I figured the driver couldn't modify these parameters since that's not a part of the hardware trust chain, but it seems I'm wrong. We'll see, I'll report back ona few days. Also hopefully Lenovo packages it soon for others!
05-11-2018 06:49 AM
I actually haven't used it much because I haven't been traveling and a while back I set my laptop to not sleep when it was plugged in (for this reason, and the keyboard backlight flickering, and the Intel card not working nicely with my AP) so haven't needed to unlock it. Next week I'll be traveling quite a bit so it will be a good test case, I'll report back after.
05-11-2018 06:55 AM
Check the thread about the keyboard backlight flickering, I posted the fix for it a few minutes ago. I would apprciate your feedback about that issue as well.
05-11-2018 08:21 AM
05-11-2018 10:26 AM