Comment 12 for bug 1038373

This is also happpening to me on ubuntu 13.04 running kernel 3.8.0-26-generic
I have the same WiFi adapter and, when I ping my router I get similar results:
64 bytes from 192.168.1.1: icmp_req=1 ttl=255 time=225 ms
64 bytes from 192.168.1.1: icmp_req=2 ttl=255 time=146 ms
64 bytes from 192.168.1.1: icmp_req=3 ttl=255 time=65.5 ms
64 bytes from 192.168.1.1: icmp_req=4 ttl=255 time=83.9 ms
64 bytes from 192.168.1.1: icmp_req=5 ttl=255 time=213 ms
64 bytes from 192.168.1.1: icmp_req=6 ttl=255 time=23.4 ms
64 bytes from 192.168.1.1: icmp_req=7 ttl=255 time=53.0 ms
64 bytes from 192.168.1.1: icmp_req=8 ttl=255 time=71.8 ms
64 bytes from 192.168.1.1: icmp_req=9 ttl=255 time=200 ms
64 bytes from 192.168.1.1: icmp_req=10 ttl=255 time=127 ms

Using the workaround iwconfig wlan0 power off I get normal results again:

PING 192.168.1.1 (192.168.1.1) 56(84) bytes of data.
64 bytes from 192.168.1.1: icmp_req=1 ttl=255 time=2.37 ms
64 bytes from 192.168.1.1: icmp_req=2 ttl=255 time=1.91 ms
64 bytes from 192.168.1.1: icmp_req=3 ttl=255 time=4.51 ms
64 bytes from 192.168.1.1: icmp_req=4 ttl=255 time=4.52 ms
64 bytes from 192.168.1.1: icmp_req=5 ttl=255 time=1.92 ms
64 bytes from 192.168.1.1: icmp_req=6 ttl=255 time=1.83 ms
^C
--- 192.168.1.1 ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5006ms
rtt min/avg/max/mdev = 1.834/2.848/4.528/1.197 ms

This is definetly a regression, using debian 7 with kernel 3.2 the problem isn't present.