"Rest finger to open" inconsistent

Mikel30

macrumors member
Original poster
Jan 11, 2004
85
8
Brand new iPhone 8. Set up as a new iPhone. A few days after using it, "Rest finger to open" for unlocking the phone no longer works as expected. If I wake up my phone (either by raising it or pressing the side button), and then rest my finger on the home button, it doesn't unlock about 75% of the time.

Some observations:
  • If I rest my finger, lift it, and then rest again, it usually does work.
  • If I rest and then press, it works, despite the "lock" icon at the top never indicating it was successfully authenticated. Of course, "pressing" shouldn't be required if "rest" is activated.
  • If I wake my device, and then quickly rest and lift my finger, it works more frequently. Odd that leaving my finger on there longer would work less consistently.

Things I've tried:
  • Restarted my phone.
  • Disabled and re-enabled "rest finger to open"
  • Disabled and re-enabled "Use TouchID to unlock phone"
  • Deleted the finger in TouchID, added other fingers.
  • Ensured I'm on 11.0.3

I was unable to recreate this on my girlfriend's iPhone 8, so I know not every iPhone is affected. However, other people seem to also have this problem. I'm curious how widespread it is, or if anyone has found a solution.
 
Last edited:

sdwaltz

macrumors 6502a
Apr 29, 2015
736
982
Indiana
No problems here - in fact, I feel like Apple made a silent upgrade in TouchID this year. Seems to work better and faster than it ever did on my 7.

Sounds to me like you have a faulty TouchID sensor.
 

Mikel30

macrumors member
Original poster
Jan 11, 2004
85
8
Sounds to me like you have a faulty TouchID sensor.
Forgot to mention that on the TouchID page, you can rest a finger and it'll highlight which one it is. When I do that, it recognizes it lightning fast. It seems to be the lock screen that isn't processing it properly.
 

virginblue4

macrumors 68000
Apr 15, 2012
1,922
452
United Kingdom
Brand new iPhone 8. Set up as a new iPhone. A few days after using it, "Rest finger to open" for unlocking the phone no longer works as expected. If I wake up my phone (either by raising it or pressing the side button), and then rest my finger on the home button, it doesn't unlock about 75% of the time.

Some observations:
  • If I rest my finger, lift it, and then rest again, it usually does work.
  • If I rest and then press, it works, despite the "lock" icon at the top never indicating it was successfully authenticated. Of course, "pressing" shouldn't be required if "rest" is activated.
  • If I wake my device, and then quickly rest and lift my finger, it works more frequently. Odd that resting and leaving my finger on there would work less consistently.

Things I've tried:
  • Restarted my phone.
  • Disabled and re-enabled "rest finger to open"
  • Disabled and re-enabled "Use TouchID to unlock phone"
  • Deleted the finger in TouchID, added other fingers.
  • Ensured I'm on 11.0.3

I was unable to recreate this on my girlfriend's iPhone 8, so I know not every iPhone is affected. However, other people seem to also have this problem. I'm curious how widespread it is, or if anyone has found a solution.
Mine also does this on my iPhone 7 Plus. No problems at all unlocking the phone normally, but on the ‘rest to open’ parts I’d say mine only works about 50% of the time. Touch ID sensor is fine. It’s obviously software related.

EDIT - Ignore my post. I misread your original post. Mines works fine when resting to unlock. It’s when trying to go directly into an app (as shown in the attached screenshot) I run into issues.

25F6BEBF-53AF-4AFA-A442-97238034FADC.jpeg
 
Last edited:

BigMcGuire

Contributor
Jan 10, 2012
4,623
5,670
California
I have the same issue on my 8+. I often times have to "click" my thumb for it to recognize that I want to get past the lock screen even though the rest finger to open is checked.

Since this involves very little extra time I haven't done anything about it and it is a minor annoyance, but yeah, nowhere near my 6s+ which recognized it instantly and unlocked instant.


Doesn't work on my 8+ 50% of the time. I tried 10 times. Worked 5 times. Didn't work 5 times.
 

digitalexplr

macrumors 65816
Dec 13, 2016
1,107
696
Central Missouri
The only time I see the fingerprint screen is if I'm opening an app from a notification and the app is fingerprint protected. Otherwise touching the TouchID is instantaneous.
 

TitsLegendary

macrumors 6502
Jun 12, 2013
405
166
Brand new iPhone 8. Set up as a new iPhone. A few days after using it, "Rest finger to open" for unlocking the phone no longer works as expected. If I wake up my phone (either by raising it or pressing the side button), and then rest my finger on the home button, it doesn't unlock about 75% of the time.

Some observations:
  • If I rest my finger, lift it, and then rest again, it usually does work.
  • If I rest and then press, it works, despite the "lock" icon at the top never indicating it was successfully authenticated. Of course, "pressing" shouldn't be required if "rest" is activated.
  • If I wake my device, and then quickly rest and lift my finger, it works more frequently. Odd that leaving my finger on there longer would work less consistently.

Things I've tried:
  • Restarted my phone.
  • Disabled and re-enabled "rest finger to open"
  • Disabled and re-enabled "Use TouchID to unlock phone"
  • Deleted the finger in TouchID, added other fingers.
  • Ensured I'm on 11.0.3

I was unable to recreate this on my girlfriend's iPhone 8, so I know not every iPhone is affected. However, other people seem to also have this problem. I'm curious how widespread it is, or if anyone has found a solution.
I have this exact same problem. Happens on both my 7+ and 8+ both running iOS 11.1
It didn’t behave this way on my 7+ running 10.3.3 as far as I can remember.