1 # Copyright (c) 2013 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 import os 6 import time 7 8 from autotest_lib.client.bin import test, utils 9 from autotest_lib.client.common_lib import base_utils, error 10 from autotest_lib.client.common_lib.cros import chrome 11 from autotest_lib.client.cros import power_utils 12 13 class power_VideoDetector(test.test): 14 version = 1 15 16 def run_once(self, run_time_sec=60): 17 if run_time_sec < 30: 18 raise error.TestError('Must run for at least 30 seconds') 19 20 with chrome.Chrome() as cr: 21 # Start powerd if not started. Set timeouts for quick idle events. 22 run_time_ms = run_time_sec * 1000 23 # At the time of writing this test, the video detector gets a status 24 # update from Chrome every ten seconds. 25 dim_ms = 10000 26 off_ms = max(3600000, run_time_ms * 10) 27 prefs = { 'has_ambient_light_sensor' : 0, 28 'ignore_external_policy' : 1, 29 'plugged_dim_ms' : dim_ms, 30 'plugged_off_ms' : off_ms, 31 'unplugged_dim_ms' : dim_ms, 32 'unplugged_off_ms' : off_ms, } 33 self._pref_change = power_utils.PowerPrefChanger(prefs) 34 35 keyvals = {} 36 37 # Start with max brightness, so we can easily detect dimming. 38 power_utils.BacklightController().set_brightness_to_max() 39 backlight = power_utils.Backlight() 40 initial_brightness = \ 41 base_utils.wait_for_value(backlight.get_max_level) 42 43 # Open a tab to play video. 44 cr.browser.platform.SetHTTPServerDirectories(self.bindir) 45 tab = cr.browser.tabs[0] 46 tab.Navigate(cr.browser.platform.http_server.UrlOf( 47 os.path.join(self.bindir, 'fade.html'))) 48 tab.WaitForDocumentReadyStateToBeComplete() 49 50 # Sleep until the runtime is up. 51 time.sleep(run_time_sec) 52 53 # Stop powerd to avoid dimming when the video stops. 54 utils.system_output('stop powerd') 55 56 final_brightness = backlight.get_level() 57 58 # Check that the backlight stayed the same. 59 if initial_brightness != final_brightness: 60 raise error.TestFail( 61 ('Backlight level changed from %d to %d when it should ' + \ 62 'have stayed the same.') % 63 (initial_brightness, final_brightness)) 64 65 keyvals['initial_brightness'] = initial_brightness 66 keyvals['final_brightness'] = final_brightness 67 self.write_perf_keyval(keyvals) 68 69 70 def cleanup(self): 71 utils.restart_job('powerd') 72
