Control fingerprint LED colors on AMD Ryzen™ 7040 Series

Framework Laptop 13 Linux
1

Is there a way to control the fingerprint LED colors on AMD Ryzen™ 7040 devices?

Trying to set the LED color with ectool works only for auto, off and white. Setting it to different colors returns:


[nix-shell:~]$ sudo ectool led power red
EC result 3 (INVALID_PARAM)

[nix-shell:~]$ sudo ectool led power yellow
EC result 3 (INVALID_PARAM)

[nix-shell:~]$ sudo ectool led power auto

[nix-shell:~]$ sudo ectool led power off

[nix-shell:~]$ sudo ectool led power white

When I run ectool led power query, I get this. Does that mean that other colors aren’t supported at all?

Brightness range for LED 1:
	red	: 0x0
	green	: 0x0
	blue	: 0x0
	yellow	: 0x0
	white	: 0x64
	amber	: 0x0

Here’s my BIOS and EC firmware versions from framework_tool --versions:

UEFI BIOS
  Version:        03.05
  Release Date:   03/29/2024
EC Firmware
  Build version:  "azalea_v3.4.113353-ec:b4c1fb,os:7b88e1,cmsis:4aa3ff 2024-03-26 07:10:22 lotus@ip-172-26-3-226"
  RO Version:     "azalea_v3.4.113353-ec:b4c1fb,os"
  RW Version:     "azalea_v3.4.113353-ec:b4c1fb,os"
  Current image:  RO
1 Like
2

As far as I know the only color supported is white.

3

It can also be set in BIOS although it is white only

4

How are you so sure the physical power LED is RGB and not just white? I haven’t seen it come on as any color other than white.

5

The fingerprint power key supports RGWY only on the Framework Laptop 13 (11th Gen Intel Core), and maybe the 12th.

Newer hardware only supports white.

6

I don’t know about AMD but I’m running this little bash script on my Framework 13 (13th Gen) and it works just fine

It’s using sysfs and not ectool though.

7

That’s a pity, having a colored indicator would be cool to have on all frameworks :smiley:
Thank you all for information!

8

This seems to change the power led, not the fingerprint reader led.

9

The name is indeed confusing as the fingerprint reader is also the power button.

It definitely changes the led around the fingerprint reader.

10

On the AMD Framework 13, I don’t have /sys/class/leds/chromeos:multicolor:power, just the following ones:

chromeos::kbd_backlight/
chromeos:multicolor:charging/
chromeos:white:power/

so this doesn’t work for me. I tries messing the the items in chromeos:white:power but that just seems to turn the white color off.

11

And you shouldn’t even see anything other, but as the power/fingerprint led is white only

12

While playing I saw that after changing sysfs values, any change to the power led with framework_tool does not work until reboot.

Is there any way to precisely control the power LED?

13

So if I’m reading this right then the newer, more modern hardware supports less?
Why did you guys switch to a new, less capable EC controller?

I have also seen Windows flash the power/fingerprint LED white, something that seemingly doesn’t work on linux or with the fw-ectool.
Running a query using the ectool gives the following capabilities of the power led:

Brightness range for LED 1:
	red	: 0x0
	green	: 0x0
	blue	: 0x0
	yellow	: 0x0
	white	: 0x64
	amber	: 0x0

Meaning that it should at least support some diming?
I have yet to find a way to actually use this brightness range though, the LED seemingly can either be completely on or completely off.

14

there is a toggle in bios to change the brightness of the fp-sensor. not sure if its possible to do from the cli with ectool.

it will also pulse the led atleast while the device is sleeping.