Enable fingerprint halo light for optical sensor on Huawei Mate 20 Pro

[deepsrd]

The mate 20 Pro has a similar optical fingerprint sensor as the Mi9.
The halo need to be enabled to it to work properly.

The fingerprint does work however, it needs the scrrrn to be on a high brightness level
I have attached the logcat from the Phh-Trable GSI build 112, this is of the fingerprint enrollment using the system app.

[deepsrd]

logcat.txt

[phhusson]

I'm not too sure what you say.
Are you saying that you enabled the halo yourself by setting the right properties, and you're now stuck after that?

[deepsrd]

Ah sorry,
I meant that the fingerprint scanner works out of the box, but with screen at high brightness.

There is no halo light as is in the stock rom. Means it does not work for unlocking the screen ..

I could not enable it at all..

[phhusson]

Ok, should be fairly easy to fix then.

Basically, you'll need (on my aosp v112) to set the following properties:
persist.vendor.sys.fp.fod.location.X_Y
persist.vendor.sys.fp.fod.size.width_height
which are the position and size of fingerprint sensor
For instance here are the values on Mi 9:
[persist.vendor.sys.fp.fod.location.X_Y]: [455,1920]
[persist.vendor.sys.fp.fod.size.width_height]: [173,173]

Once you do that, android will show you a light green circle where to put your finger, and when you press your finger there, it will make the brightness at 100% while diming the rest of the screen (so as not to blind you if you were at low brightness)

To improve this further, you should set this in a framework-res overlay:

+    <integer translatable="false" name="config_brightness_ramp_rate_fast">10000</integer>
+    <integer translatable="false" name="config_brightness_ramp_rate_slow">10000</integer>

[deepsrd]

Ah cool!!

I will test it and report back..

Thanks a million!

[deepsrd]

Amazing , it works!!

How can I port this to other roms? like Lineage?
What changes do I need to pick?

[phhusson]

Could you get me your ro.vendor.build.fingerprint and tell me what values did you use for x_y and width_height?

The patch is at phhusson/platform_frameworks_base@64b2e6d

[deepsrd]

[[ro.vendor.build.fingerprint]]: [[kirin980/kirin980/kirin980:9/PPR1.180610.011/jenkins03052134:user/release-keys]]

I havent fine tuned the location yet, I will post it here once i get the values..

[phhusson]

@deepsrd any news? :-)

[deepsrd]

So sorry, I was on holidays..
I was tinkering with it and i was building xxxhdpi build,and the values i used are 720,1540 ..
These are still a bit off, since the coordinates from the stock rom does not match up when I use it on the gsi..
Also, the screen rotation is not supported, minor issue :)

I will experiment more and update here as I get closer..

[Diazz72]

Are this things fixed.
If not do you require something from us ( coordinates...etc ) for a fix?

Thanks and regards, Diazz72.

[penn5]

He needs coords, size and hal