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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
5from autotest_lib.client.bin import test
6from autotest_lib.client.common_lib import error
7from autotest_lib.client.cros import power_utils, sys_power
8
9
10class power_BacklightSuspend(test.test):
11    version = 1
12
13    def run_once(self, resume_percent=70):
14        results = {}
15        backlight = power_utils.Backlight()
16
17        results['initial_brightness'] = backlight.get_level()
18        max_level = backlight.get_max_level()
19        resume_level = int(round(max_level * resume_percent / 100))
20
21        # If the current brightness is the same as the requested brightness,
22        # request 100 - |resume_brightness| instead.
23        if resume_level == results['initial_brightness']:
24            resume_level = max_level - resume_level
25        backlight.set_resume_level(resume_level)
26
27        sys_power.kernel_suspend(seconds=5)
28
29        final_level = backlight.get_level()
30        if final_level != resume_level:
31            raise error.TestFail(
32                ('Brightness level after resume did not match requested ' + \
33                 'brightness: %d vs %d') % (final_level, resume_level))
34
35        results['resume_brightness'] = resume_level
36        self.write_perf_keyval(results)
37