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, upstart 12 13 class power_VideoDetector(test.test): 14 """ 15 Verify the backlight does not get dimmed while playing video. 16 """ 17 18 version = 1 19 20 def run_once(self, run_time_sec=60): 21 """ 22 @param run_time_sec: time to run the test 23 """ 24 if run_time_sec < 30: 25 raise error.TestError('Must run for at least 30 seconds') 26 27 with chrome.Chrome(init_network_controller=True) as cr: 28 # Start powerd if not started. Set timeouts for quick idle events. 29 run_time_ms = run_time_sec * 1000 30 # At the time of writing this test, the video detector gets a status 31 # update from Chrome every ten seconds. 32 dim_ms = 10000 33 off_ms = max(3600000, run_time_ms * 10) 34 prefs = { 'has_ambient_light_sensor' : 0, 35 'ignore_external_policy' : 1, 36 'plugged_dim_ms' : dim_ms, 37 'plugged_off_ms' : off_ms, 38 'unplugged_dim_ms' : dim_ms, 39 'unplugged_off_ms' : off_ms, } 40 self._pref_change = power_utils.PowerPrefChanger(prefs) 41 42 keyvals = {} 43 44 # Start with max brightness, so we can easily detect dimming. 45 power_utils.BacklightController().set_brightness_to_max() 46 backlight = power_utils.Backlight() 47 initial_brightness = \ 48 base_utils.wait_for_value(backlight.get_max_level) 49 50 # Open a tab to play video. 51 cr.browser.platform.SetHTTPServerDirectories(self.bindir) 52 tab = cr.browser.tabs[0] 53 tab.Navigate(cr.browser.platform.http_server.UrlOf( 54 os.path.join(self.bindir, 'fade.html'))) 55 tab.WaitForDocumentReadyStateToBeComplete() 56 57 # Sleep until the runtime is up. 58 time.sleep(run_time_sec) 59 60 # Stop powerd to avoid dimming when the video stops. 61 utils.system_output('stop powerd') 62 63 final_brightness = backlight.get_level() 64 65 # Check that the backlight stayed the same. 66 if initial_brightness != final_brightness: 67 raise error.TestFail( 68 ('Backlight level changed from %d to %d when it should ' + \ 69 'have stayed the same.') % 70 (initial_brightness, final_brightness)) 71 72 keyvals['initial_brightness'] = initial_brightness 73 keyvals['final_brightness'] = final_brightness 74 self.write_perf_keyval(keyvals) 75 76 77 def cleanup(self): 78 """ 79 Cleanup powerd after test. 80 """ 81 upstart.restart_job('powerd') 82
