My XPS 15 9550 tends to wake from sleep instantly or after a short while. I find this particularly inconvenient if I find it hot in the backpack. It occurs on battery, power adapter, and powered via the WD15 dock.
For instance, info from Event log \ System:
Information 22/11/2016 22:13:42 Power-Troubleshooter 1 None
The system has returned from a low power state.
Sleep Time: 2016-11-22T21:13:22.481918500Z
Wake Time: 2016-11-22T21:13:40.495506200Z
Wake Source: Unknown
I tried to debug the condition using powercfg, but I am not able to locate the cause.
powercfg -lastwake
Wake History Count - 1
Wake History [0]
Wake Source Count - 0
powercfg -devicequery wake_armed
NONE
(because I have disabled everything which could cause wake)
powercfg -availablesleepstates
The following sleep states are available on this system:
Standby (S3)
Hibernate
Hybrid Sleep
Fast Startup
The following sleep states are not available on this system:
Standby (S1)
The system firmware does not support this standby state.
Standby (S2)
The system firmware does not support this standby state.
Standby (S0 Low Power Idle)
The system firmware does not support this standby state.
Is this normal? I have noticed that toggling 'C states' in BIOS doesn't affect the outcome.
powercfg /sleepstudy
S0 Low Power Idle is not supported on this machine. Cannot run tool.
Finally, powercfg -energy makes a long report, but I don't know if it is of any use:
Power Efficiency Diagnostics Report
Computer Name | OOOPS |
Scan Time | 2016-11-22T18:04:37Z |
Scan Duration | 69 seconds |
System Manufacturer | Dell Inc. |
System Product Name | XPS 15 9550 |
BIOS Date | 08/31/2016 |
BIOS Version | 1.2.14 |
OS Build | 10240 |
Platform Role | PlatformRoleMobile |
Plugged In | false |
Process Count | 131 |
Thread Count | 1815 |
Report GUID | {3eb69dcf-8858-4635-844e-adca279a885b} |
Analysis Results
Errors
The current power policy for 802.11-compatible wireless network adapters is not configured to use low-power modes.
The current power policy for PCI Express Active State Power Management (ASPM) is configured to Off.
The display is not configured to turn off after a period of inactivity.
The computer is not configured to automatically sleep after a period of inactivity.
The current power policy for PCI Express Active State Power Management (ASPM) is configured to Off.
The average processor utilization during the trace was high. The system will consume less power when the average processor utilization is very low. Review processor utilization for individual processes to determine which applications and services contribute the most to total processor utilization.
Average Utilization (%) | 20.68 |
PCI Express Active-State Power Management (ASPM) has been disabled due to a known incompatibility with the hardware in this computer.
Devices with missing or misconfigured drivers can increase power consumption.
Device Name | Cisco AnyConnect Secure Mobility Client Virtual Miniport Adapter for Windows x64 |
Device ID | ROOT\NET\0000 |
Device Status | 0x1802401 |
Device Problem Code | 0x16 |
Warnings
The default platform timer resolution is 15.6ms (15625000ns) and should be used whenever the system is idle. If the timer resolution is increased, processor power management technologies may not be effective. The timer resolution may be increased due to multimedia playback or graphical animations.
Current Timer Resolution (100ns units) | 40000 |
Maximum Timer Period (100ns units) | 156250 |
A program or service has requested a timer resolution smaller than the platform maximum timer resolution.
Requested Period | 40000 |
Requesting Process ID | 7072 |
Requesting Process Path | \Device\HarddiskVolume5\Program Files (x86)\Google\Chrome\Application\chrome.exe |
Information
The stack of modules responsible for the lowest platform timer setting in this process.
Requested Period | 10000 |
Requesting Process ID | 7072 |
Requesting Process Path | \Device\HarddiskVolume5\Program Files (x86)\Google\Chrome\Application\chrome.exe |
Calling Module Stack | \Device\HarddiskVolume5\Windows\System32\ntdll.dll |
| \Device\HarddiskVolume5\Windows\System32\kernel32.dll |
| \Device\HarddiskVolume5\Program Files (x86)\Google\Chrome\Application\54.0.2840.99\chrome_child.dll |
| \Device\HarddiskVolume5\Program Files (x86)\Google\Chrome\Application\chrome.exe |
| \Device\HarddiskVolume5\Windows\System32\kernel32.dll |
| \Device\HarddiskVolume5\Windows\System32\ntdll.dll |
The current power plan in use
Plan Name | OEM Balanced |
Plan GUID | {381b4222-f694-41f0-9685-ff5bb260df2e} |
The personality of the current power plan when the system is on battery power.
Enables Windows Media Player to optimize for quality or power savings when playing video.
Quality Mode | Balance Video Quality and Power Savings |
The personality of the current power plan when the system is plugged in.
The current power policy for 802.11-compatible wireless network adapters is not configured to use low-power modes.
Enables Windows Media Player to optimize for quality or power savings when playing video.
Quality Mode | Optimize for Video Quality |
Analysis was successful. No energy efficiency problems were found. No information was returned.
Analysis was successful. No energy efficiency problems were found. No information was returned.
Battery ID | 41179Samsung SDIDELL M7R9658 |
Manufacturer | Samsung SDI |
Serial Number | 41179 |
Chemistry | LiP |
Long Term | 1 |
Sealed | 0 |
Design Capacity | 55997 |
Last Full Charge | 53158 |
Sleep states allow the computer to enter low-power modes after a period of inactivity. The S3 sleep state is the default sleep state for Windows platforms. The S3 sleep state consumes only enough power to preserve memory contents and allow the computer to resume working quickly. Very few platforms support the S1 or S2 Sleep states.
S1 Sleep Supported | false |
S2 Sleep Supported | false |
S3 Sleep Supported | true |
S4 Sleep Supported | true |
Connected standby allows the computer to enter a low-power mode in which it is always on and connected. If supported, connected standby is used instead of system sleep states.
Connected Standby Supported | false |
This computer enables Windows to automatically control the brightness of the integrated display.
Effective processor power management enables the computer to automatically balance performance and energy consumption.
Group | 0 |
Index | 0 |
Idle State Count | 3 |
Idle State Type | ACPI Idle (C) States |
Nominal Frequency (MHz) | 2601 |
Maximum Performance Percentage | 100 |
Lowest Performance Percentage | 30 |
Lowest Throttle Percentage | 30 |
Performance Controls Type | ACPI Performance (P) / Throttle (T) States |