[BUG] Predesktop authentication with fingerprint not working for some passwords

[LordPhoenix]

Hi!

I'm suffering from an annoying bug on my new X220t. The bug is apparently identical to the one reported at http://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/Bug-in-Predesktop-Authentification-with-Finger..., except it's happening on the X220t.

Details of my configuration:

- Fingerprints registered on Windows 7 using the fingerprint software

- Predesktop authentication activated in the BIOS

- Power-on password activated in the BIOS

Steps to reproduce the bug:

- Start the X220t
- Swipe finger as requested
- Enter power-on password for the first time (crossed-hand sign shown)
- X220t boots into Win7
- Shut down X220t
- Power on again
- Swipe finger as requested
- X220t asks for password AGAIN (crossed-hand sign shown)

The same passwords as in the other bug report fail:

8g3hwf7vuxq9
s39wfeqm0t26

My 24-character password also fails.

Passwords which succeed:

abcdefgh

abcefghijklmnopqrstuvwx

Can you please confirm the bug and issue a fix?

This is a very disturbing bug to find on not one but two business laptops...

Best regards,

LP

[someotherguy]

What BIOS version are you using?  The issue was fixed starting in BIOS version 1.18 for X220...

- (Fix) Fixed an issue where password authentication might be failed by using 
        fingerprint depending on the password string.

[LordPhoenix]

That must be it then. I'm running a 1.17 BIOS. However, the 1.18 BIOS doesn't appear in the Lenovo updater...

[someotherguy · Accepted solution]

The updater is hopelessly behind and I don't know why.  You can get the latest BIOS directly from the support website.

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/8duj09us.exe

[LordPhoenix]

Thanks!