Comment 1 for bug 367121

I have the same problem.

Workaround: After every kernel update I must recompile the wireless driver from compat-wireless with the following modifications in iwl-4965.c

  struct iwl_cfg iwl4965_agn_cfg = {
  ...
  .broken_powersave = true
  }

change this to

  struct iwl_cfg iwl4965_agn_cfg = {
  ...
  .broken_powersave = false
  }

So I must set broken_powersave = false to get working wlan powsersafe.

broken_powersave = true has been introduced in the kernel as a "bug fix" to prevent some other bug (that is not interesting for me, because it is more important to keep the wlan card cool), see http://readlist.com/lists/vger.kernel.org/linux-kernel/149/746227.html