As requested I've tested the latest upstream kernel.
> uname -a:
Linux vaio 3.5.0-030500rc2-generic #201206082235 SMP Sat Jun 9 02:36:22 UTC 
2012 x86_64 x86_64 x86_64 GNU/Linux

After a short while I saw a short connection loss. Linux was able to
recover from this and re-establish the connection. However after
approximately one hour the connection was dropped again and this time
could not be re-established. I had to use the hardware switch for
wireless connections to recover from that situation. Contrary to my
tests with the ubuntu kernel several error messages appeared in dmesg
(see attachment).

And additionally (but probably unrelated) I was not able to use my
bluetooth mouse with kernel 3.5.x at all. For testing I used a usb mouse
today.

Please let me know if you need further testing. Unfortunately "ubuntu-
bug" refused to work today because of the mainline kernel (otherwise I
possibly would have more detailed information).

** Attachment added: "Output of dmesg"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1013257/+attachment/3190954/+files/2012-05-22-ubuntu-12.04-amd64-mainline-kernel-3.5-dmesg.txt

** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1013257

Title:
  Wifi disconnects with intel chipset

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