Comment 20 for bug 144621

Unfortunately I have to confirm this bug is still present with current and up-to-date Ubuntu Gutsy.

From time to time, mostly some time after there is no network activity the network becomes inresponsive, although both ifconfig and iwconfig show wlan0 still up and NetworkManager applet shows link is present.

so far nothing helps the network resume other than a reboot.
asking NetworkManager applet for a reconnect, issuing ifconfig wlan0 down and then up does nothing, the network still remanins frozen.

dmesg output is attached,
follows lspci -vvv output