use iw instead of iwconfig to control power save mode

server/site_wifitest.py

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import common, fnmatch, logging, os, re, string, threading, time
 
 from autotest_lib.server import autotest, hosts, subcommand
 from autotest_lib.server import site_bsd_router
 from autotest_lib.server import site_linux_router
 from autotest_lib.server import site_host_attributes
@@ skipping 247 matching lines @@
         result = self.client.run('python "%s" "%s" "%d"' %
             (script_client_file,
             params.get('ssid', self.defssid),
             params.get('wait_timeout', self.deftimeout))).stdout.rstrip()
 
         print "%s: %s" % (self.name, result)
 
 
     def client_powersave_on(self, params):
         """ Enable power save operation """
-        self.client.run("iwconfig %s power on" % self.client_wlanif)
+        self.client.run("iw dev %s set power_save on" % self.client_wlanif)
 
 
     def client_powersave_off(self, params):
         """ Disable power save operation """
-        self.client.run("iwconfig %s power off" % self.client_wlanif)
+        self.client.run("iw dev %s set power_save off" % self.client_wlanif)
 
 
     def __client_check(self, param, want):
         """ Verify negotiated station mode parameter """
         result = self.client.run("cat '%s/%s'" %
             (self.client_debugfs_path, param))
         got = result.stdout.rstrip()       # NB: chop \n
         if got != want:
             raise error.TestFail("client_check_%s: wanted %s got %s",
                 param, want, got)
@@ skipping 395 matching lines @@
     if server_addr is None and hasattr(client_attributes, 'server_addr'):
         server_addr = client_attributes.server_addr
     if server_addr is not None:
         server['addr'] = server_addr;
     # TODO(sleffler) check for wifi_addr when no control address
 
     # tag jobs w/ the router's address on the control network
     config['tagname'] = router['addr']
 
     return config