PWM Backlight Issue

I have an issue with the backlight enable signal. As soon as I add the entry enable-gpios = <&gpio5 1 GPIO_ACTIVE_HIGH>; in the bl node of the device tree linux does no longer show anything under /sys/class/backlight. If I remove the entry “enable-gpios” I do see /sys/class/backlight and can use the brightness value to adjust the PWM settings. However due to the fact that the newer version of u-boot-toradex disables the backlight signal before booting Linux I need to be in control of the enable signal from the OS.

Do you have any tricks on how to debug the issue? I didn’t find any problems reported by dmesg.

Best regards,

HI @michaelg

Thanks for writing to the Toradex Community!

Could you share all the changes you have done to the devicetree and the dmesg log?

Please note, that Kernel 4.1 is not supported any more. You should update to at least 4.9 at yours earliest convenience.

Best regards,