iwconfig and wavemon don't update stats

[botinok]

Hi.

I've just updated world and kernel and got this issue. The wireless connection works fine as usual, but statistics about link quality and signal level is no more updating.
Here is exactly the same problem https://unix.stackexchange.com/questions/203138/what-are-possible-reasons-why-iwconfig-is-not-updating-connection-stats

I've rebuilt all net-wireless/* packages, and tried switching power management, but it didn't help.

Thanks.