I have an Amilo A1630 with integrated rt2500 WLAN chipset. Since 2.6.15.22 Laptop locks up / frezzes when i activte the WLAN-device after some minutes. With 2.6.15.23 still same problem. So i can confirm this problem. -- pcmcia Ralink RT2500 driver freezes laptop while working on batteries https://launchpad.net/bugs/24361