Hello everyone,
I've just flashed linksys wrt1900acs and everything works as expected except LED lights, switch lights are good but power/wifi/sata panel is really dimmed.
After looking into /sys/class/leds/${led}/max_brightness is set to 1 and i cannot change it.
echo "255" > shelby:white:power/max_brightness results in ash: write error: I/O error
Any help is appreciated.
Some leds are on/off but historically they were controlled by byte value. 255-on 0 - off, middle - undefined. Now they are collapsed to predictable values.
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The LEDs on some wrtpac members are noted to fade over time, go figure.
Not sure what this last line means, my led is on as brightness is set to 1 but it is very dimm like 1/255 of full value but i cannot change max_brightness so when i change brightness to 255 and rebot it it blinks very bright and gets restored to value of 1 after reboot.
You need to backtrack dts changes in this case. I got only bool led-s so I appreciate this feat....
sure, i've seen that but leds were fine untill i've flashed openwrt.
You can expose gpio-s and write whatever values bypassing led device in kernel (/sys/class/{gpios|led} )
i also get IO error while trying to update max_brightness file there 
It is more complex - you expose led gpio as seen in dts file, then write values bypassing led framework checks.