I'm still in the process of looking through the data you sent me.
Everything I've seen so far points to loss of beacons from the AP, but
if wireless on your phone continues to work then I have to think the AP
is sending beacons. The second dump is interesting because it shows
associations followed almost immediately by beacon loss messages which
lead to disassociation.

One thing you can try while I continue looking at the data is to test a
newer kernel version to see if you still have problems there. We have
builds that you can download and install at http://kernel.ubuntu.com
/~kernel-ppa/mainline/, with the newest kernel currently being 3.16-rc7:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-rc7-utopic/

You should just need to download the linux-image-*-generic_*amd64.deb
and install it (sudo dpkg -i <filename>), then reboot into the new
kernel. This should also cause you to use the newer -9 firmware, so if
you find this kernel works well I'd be curious to know if it still works
well with the -8 firmware. You can test this by moving/renaming
/lib/firmware/iwlwifi-7260-9.ucode and running 'sudo modprobe -r
iwlwifi; sudo modprobe iwlwifi'. Thanks!

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https://bugs.launchpad.net/bugs/1349572

Title:
  Wireless network disconnections on Dell XPS 13

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