Host: chromeos2-row10-rack7-host15
DUT : pyro
ChromeOS: R61-9765.16.0

-------------------------------------------------------------------------------------------------
/tmp/test_that_results_q3Xl7t/results-1-power_BacklightSuspend                        [  FAILED  ]
/tmp/test_that_results_q3Xl7t/results-1-power_BacklightSuspend                          FAIL: Brightness level after resume did not match requested brightness: 0 vs 33600
/tmp/test_that_results_q3Xl7t/results-1-power_BacklightSuspend/power_BacklightSuspend [  FAILED  ]
/tmp/test_that_results_q3Xl7t/results-1-power_BacklightSuspend/power_BacklightSuspend   FAIL: Brightness level after resume did not match requested brightness: 0 vs 33600
-------------------------------------------------------------------------------------------------
Total PASS: 0/2 (0%)

Test failed after running manually from my chroot. I Will check it on more device/builds.

Test results on few more devices:
Host: chromeos1-row1-rack3-host6
DUT: Kevin
Result:
-------------------------------------------------------------------------------------------------
/tmp/test_that_results_31X2TW/results-1-power_BacklightSuspend                        [  PASSED  ]
/tmp/test_that_results_31X2TW/results-1-power_BacklightSuspend/power_BacklightSuspend [  PASSED  ]
/tmp/test_that_results_31X2TW/results-1-power_BacklightSuspend/power_BacklightSuspend   initial_brightness                                                                  45874
/tmp/test_that_results_31X2TW/results-1-power_BacklightSuspend/power_BacklightSuspend   resume_brightness                                                                   19661
-------------------------------------------------------------------------------------------------
Total PASS: 2/2 (100%)

Host: chromeos1-row1-rack4-host3
Dut: Snow
Result:
-------------------------------------------------------------------------------------------------
/tmp/test_that_results_B3JnOX/results-1-power_BacklightSuspend                        [  PASSED  ]
/tmp/test_that_results_B3JnOX/results-1-power_BacklightSuspend/power_BacklightSuspend [  PASSED  ]
/tmp/test_that_results_B3JnOX/results-1-power_BacklightSuspend/power_BacklightSuspend   initial_brightness                                                                  1960
/tmp/test_that_results_B3JnOX/results-1-power_BacklightSuspend/power_BacklightSuspend   resume_brightness                                                                   840
-------------------------------------------------------------------------------------------------
Total PASS: 2/2 (100%)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/9fb2716b95616feca161c987d47593563a0b5f23

commit 9fb2716b95616feca161c987d47593563a0b5f23
Author: Sridhar Sonti <sontis@chromium.org>
Date: Wed Aug 09 21:05:11 2017

Add power_BacklightSuspend to usb_detect suite.

BUG= chromium:752707 
TEST=None

Change-Id: I5f50764b43543bbf4fdd5db9517ac4706350edbf
Reviewed-on: https://chromium-review.googlesource.com/602258
Commit-Ready: Sridhar Sonti <sontis@google.com>
Tested-by: Sridhar Sonti <sontis@chromium.org>
Tested-by: Sridhar Sonti <sontis@google.com>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>

[modify] https://crrev.com/9fb2716b95616feca161c987d47593563a0b5f23/client/site_tests/power_BacklightSuspend/control

power_BacklightSuspend test is deleted.

CL: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/956346