I have since found the issue, the sysfs interface accepts only brightness values between 0-8 (corresponding to an index in the pwm settings from the device tree : backlight in arch/arm/boot/dts/am437x-gp-evm.dts). The liblights HAL tried to write values greater than 8. Furthermore, the message printed is misleading, as it assumes any error in write_int stems from an open() error.
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