Previously I had various builds of dd-wrt on my WRT610Nv2 router and there were no issues with reconnecting on 5 GHz after waking up the laptop - 270-300 Mbit/s transmit rate was attained almost immediately without hickups.
Now I have used 1.28.9054MIPSR2-VPN and the latest RAF mod and both give me the same problem - everything is fine until putting macbook to sleep. When I then wake it up again, then most usual scenario is that transmit rate will jump to 150 mbit and gets "stuck" on this value - only way to get around it is to try to connect to other network and then back (does not always help) or turn the Airport off and back on again. After that the 300 mbit is back and everything is fine… until next sleep. I even tried one more time to reflash back to dd-wrt to exclude the possibility, that OSX 10.6.7 update could have a part in this - nope, it was the same - dd-wrt did not have a problem.
Setup is the same as with dd-wrt: distance between router and computer is about 2-3 meters in the same room and the signal levels are about the same on both occasions (-45…50 dBm), channels 36 or 52, 40MHz channel witdh, WPA2 Personal/AES. Computer - 13" Macbook Pro late 2010 with BCM43xxx 1.0 (18.104.22.168.9). No other 5 GHz networks can not be detected in the nearest neighborhood.
Changing the transmitting power does not seem to help and no help from changing other advanced parameters either and time factor does not make a difference - same thing if computer is waked up after either 15 minutes or 5 hours.
What can be causing this if this problem is not present with dd-wrt? Can there be some differences in negotiating the transmit rate or resuming the connection?