Looking at disk qual we have some suspend failures: for instance:
https://pantheon.corp.google.com/storage/browser/chromeos-moblab-quanta/results/54:ab:3a:d9:99:92/d93fd5d0e25f11e8bdf2b91b95abc642/358-moblab/192.168.231.102/hardware_StorageQualSuspendStress.suspend/power_SuspendStress.disk/sysinfo/

The reason is 
"12/10 02:37:20.115 DEBUG|              test:0381| Test failed due to Sanity check failed: did not try to suspend.."

Looking in messages, it looks like we are missing some lines:
...
2018-12-10T02:36:59.609005-08:00 NOTICE autotest[7425]: 02:36:59.590 ERROR|         sys_power:0129| Woke up early at 1544438192
2018-12-10T02:36:59.609775-08:00 ERR shill[1310]: [ERROR:object_proxy.cc(580)] Failed to call method: fi.w1.wpa_supplicant1.Interface.Scan: object_path= /fi/w1/wpa_supplicant1/Interfaces/1: fi.w1.wpa_supplicant1.Interface.ScanError: Scan request rejected
2
...

Preventing the test to find how well we are suspending and resuming.
 

Deleted: results_54_ab_3a_d9_99_92_d93fd5d0e25f11e8bdf2b91b95abc642_358-moblab_192.168.231.102_hardware_StorageQualSuspendStress.suspend_power_SuspendStress.disk_debug_power_SuspendStress.disk.DEBUG 15.3 KB

results_54_ab_3a_d9_99_92_d93fd5d0e25f11e8bdf2b91b95abc642_358-moblab_192.168.231.102_hardware_StorageQualSuspendStress.suspend_power_SuspendStress.disk_debug_power_SuspendStress.disk.DEBUG 15.3 KB Download

Deleted: results_54_ab_3a_d9_99_92_d93fd5d0e25f11e8bdf2b91b95abc642_358-moblab_192.168.231.102_hardware_StorageQualSuspendStress.suspend_power_SuspendStress.disk_sysinfo_messages 630 KB

results_54_ab_3a_d9_99_92_d93fd5d0e25f11e8bdf2b91b95abc642_358-moblab_192.168.231.102_hardware_StorageQualSuspendStress.suspend_power_SuspendStress.disk_sysinfo_messages 630 KB Download