RB532 + AR9223 MiniPCI, LEDs not working

I have a RB532 and recently I have put a noname AR9223 Mini PCI card in.
All is working but not the MiniPCI LEDs on the RB532.
I have tried both miniPCI slots.
According to the RB532 manual: “2 pairs of MiniPCI LEDs are connected to MiniPCI slots (two LEDs per slot) according to standards.”
Does it mean, that the miniPCI card is “not standard” or could there be an other problem?