NanoPi R5C: lan1_led is not controllable?

[danergo]

I can use lan2_led with any interface (eth0, eth1, wlan0), with trigger and device_name configuration, and also manually by setting its brightness.

But lan1_led I can't control. Sometimes it turns on for a very short pulse, when I'm trying to manually control it.

Moreover it's very strange:

# cat /sys/kernel/debug/gpio
gpiochip0: GPIOs 0-31, parent: platform/fdd60000.gpio, gpio0:
 gpio-0   (                    |reset               ) out hi 
 gpio-5   (                    |vcc5v0-otg-regulator) out hi 
 gpio-6   (                    |vcc5v0-host-regulato) out hi 
 gpio-14  (                    |reset               ) out hi 
 gpio-15  (                    |K1                  ) in  hi IRQ ACTIVE LOW

gpiochip1: GPIOs 32-63, parent: platform/fe740000.gpio, gpio1:

gpiochip2: GPIOs 64-95, parent: platform/fe750000.gpio, gpio2:
 gpio-90  (                    |shutdown            ) out hi 

gpiochip3: GPIOs 96-127, parent: platform/fe760000.gpio, gpio3:
 gpio-98  (                    |sys_led             ) out lo 
 gpio-99  (                    |lan1_led            ) out hi 
 gpio-100 (                    |wan_led             ) out lo 
 gpio-101 (                    |lan2_led            ) out hi 
 gpio-113 (                    |reset               ) out hi 

gpiochip4: GPIOs 128-159, parent: platform/fe770000.gpio, gpio4:

gpiochip5: GPIOs 511-511, parent: platform/rk805-pinctrl, rk817-gpio, can sleep:

As you can see, both lan1_led and lan2_led are "out hi". But only lan2_led is lighting.

How can I control lan1_led?