I have a EliteBook 8530w, with Intel WiFi 5300 too, and bought a new D-Link DIR-855 with 5GHz WLAN and 802.11n. I've got the exact same message.
uname -a Linux alpha 2.6.31-12-generic #41-Ubuntu SMP Wed Oct 7 19:37:12 UTC 2009 x86_64 GNU/Linux iwconfig wlan0 says something interessting: wlan0 IEEE 802.11abgn ESSID:"my_wlan_5ghz" Mode:Managed Frequency:5.22 GHz Access Point: 00:24:01:34:41:1C Bit Rate=0 kb/s Tx-Power=15 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=69/70 Signal level=-41 dBm Noise level=-91 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 Bit Rate=0 kb/s? rmmod iwlagn & modprobe iwlagn helps for me. Sometimes i need to do it several times, then suddenly ping works, and sometimes for longer times, sometimes only for a few seconds... bye falstaff -- [karmic] Intel WiFi Link 5300 sometimes not working on 5 GHz https://bugs.launchpad.net/bugs/420678 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs