我担心，又有一个 Windows 不会休眠线程……
运行 Windows 10 v1909，一切正常。监视器关闭，然后计算机根据电源配置设置进入睡眠状态。所有设备驱动程序都是最新的（如果可用，则通过供应商提供，如果不可用，则通过 Microsoft 提供）。BIOS 是最新版本，尽管已经有好几年的历史了（主板制造商似乎不再愿意支持一年或一年以上的硬件）。
去年我尝试将功能更新至 v2004。 功能更新后，计算机立即不再关闭显示器或进入睡眠状态。 即使我在重启后立即将其留在登录屏幕上，它也不会进入睡眠状态。所以我确信这不是 Chrome 或其他常见的应用程序。
我尝试了老powercfg /requests方法来试图找出是什么让它保持清醒，结果全部返回“无”。
恢复到 v1909 并且睡眠恢复正常。
快进到去年年底，尝试了 v20H2，希望问题可能已经解决。没有。在 v1909 下几个月都睡得很好，但更新后电脑就不再睡了。
恢复到 v1909，一切又恢复正常。将计算机保持在 1909，安装所有必要的 Windows 更新以及新设备驱动程序。完全没有问题，显示器关机和睡眠都正常。
现在是 2021 年 5 月，新的功能更新已发布。我安装了 v21H1，但问题再次出现。显示器无法关机，计算机无法休眠。我再次检查powercfg /requests，所有条目都显示“无”。我已将显示器关机和休眠定时器缩短至 3 分钟，以减少某些偶尔出现的进程使计算机保持唤醒状态的可能性，但并没有什么不同。
按下键盘上的睡眠按钮可以正常工作，并且计算机保持睡眠状态（没有意外唤醒），并且唤醒工作正常。
此刻我不知所措。我能想到的唯一两条路是禁用 DM 中的所有非关键设备，如果失败，则执行全新安装。在开始这条路之前，我很想听听大家的其他建议。
谢谢！
迄今为止的诊断：
提醒一下，在安装功能更新之前，睡眠功能在 v1909 下运行良好，但在安装功能更新后立即停止工作（分别尝试从 1909 升级到 2004 或 20H2 或 21H1）。恢复到 1909 后，睡眠功能一切正常。
powercfg /requests- 所有条目均表示None
powercfg /systemsleepdiagnostics- 错误结果：“不存在睡眠跟踪文件。让机器进入睡眠状态几分钟，然后重试。”手动让计算机进入睡眠状态仍然会导致此错误”
在安全模式下重新启动系统。安全模式不允许更改睡眠设置，但有一个用于关闭显示器的计时器。关闭显示器的计时器设置为 5 分钟，但显示器从未关闭。（当然，系统也从未进入睡眠状态）
powercfg /a表示待机 (S3)、休眠和快速启动可用。它指出由于虚拟机管理程序，混合不可用。我以为在更新之前（在 v1909 中）可以使用混合睡眠，但如果不将系统恢复到以前的版本，我就无法确定。
powercfg -energy有一个可疑条目，内容是“由于已知与此计算机硬件不兼容，PCI Express 主动状态电源管理 (ASPM) 已被禁用。”我不记得在功能更新之前当计算机能够进入睡眠状态时是否出现过同样的问题。 这个老问题（Windows 7）似乎指向的可能是 USB 组件，尽管我的组件都没有变化。将拔掉所有电源，看看会发生什么。
powercfg /q输出：
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e (Balanced)
GUID Alias: SCHEME_BALANCED
Subgroup GUID: 0012ee47-9041-4b5d-9b77-535fba8b1442 (Hard disk)
GUID Alias: SUB_DISK
Power Setting GUID: 6738e2c4-e8a5-4a42-b16a-e040e769756e (Turn off hard disk after)
GUID Alias: DISKIDLE
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0xffffffff
Possible Settings increment: 0x00000001
Possible Settings units: Seconds
Current AC Power Setting Index: 0x000004b0
Current DC Power Setting Index: 0x00000258
Subgroup GUID: 02f815b5-a5cf-4c84-bf20-649d1f75d3d8 (Internet Explorer)
Power Setting GUID: 4c793e7d-a264-42e1-87d3-7a0d2f523ccd (JavaScript Timer Frequency)
Possible Setting Index: 000
Possible Setting Friendly Name: Maximum Power Savings
Possible Setting Index: 001
Possible Setting Friendly Name: Maximum Performance
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000000
Subgroup GUID: 0d7dbae2-4294-402a-ba8e-26777e8488cd (Desktop background settings)
Power Setting GUID: 309dce9b-bef4-4119-9921-a851fb12f0f4 (Slide show)
Possible Setting Index: 000
Possible Setting Friendly Name: Available
Possible Setting Index: 001
Possible Setting Friendly Name: Paused
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000001
Subgroup GUID: 19cbb8fa-5279-450e-9fac-8a3d5fedd0c1 (Wireless Adapter Settings)
Power Setting GUID: 12bbebe6-58d6-4636-95bb-3217ef867c1a (Power Saving Mode)
Possible Setting Index: 000
Possible Setting Friendly Name: Maximum Performance
Possible Setting Index: 001
Possible Setting Friendly Name: Low Power Saving
Possible Setting Index: 002
Possible Setting Friendly Name: Medium Power Saving
Possible Setting Index: 003
Possible Setting Friendly Name: Maximum Power Saving
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000002
Subgroup GUID: 238c9fa8-0aad-41ed-83f4-97be242c8f20 (Sleep)
GUID Alias: SUB_SLEEP
Power Setting GUID: 29f6c1db-86da-48c5-9fdb-f2b67b1f44da (Sleep after)
GUID Alias: STANDBYIDLE
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0xffffffff
Possible Settings increment: 0x00000001
Possible Settings units: Seconds
Current AC Power Setting Index: 0x00000708
Current DC Power Setting Index: 0x00000384
Power Setting GUID: 94ac6d29-73ce-41a6-809f-6363ba21b47e (Allow hybrid sleep)
GUID Alias: HYBRIDSLEEP
Possible Setting Index: 000
Possible Setting Friendly Name: Off
Possible Setting Index: 001
Possible Setting Friendly Name: On
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000001
Power Setting GUID: 9d7815a6-7ee4-497e-8888-515a05f02364 (Hibernate after)
GUID Alias: HIBERNATEIDLE
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0xffffffff
Possible Settings increment: 0x00000001
Possible Settings units: Seconds
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000000
Power Setting GUID: bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d (Allow wake timers)
GUID Alias: RTCWAKE
Possible Setting Index: 000
Possible Setting Friendly Name: Disable
Possible Setting Index: 001
Possible Setting Friendly Name: Enable
Possible Setting Index: 002
Possible Setting Friendly Name: Important Wake Timers Only
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000001
Subgroup GUID: 2a737441-1930-4402-8d77-b2bebba308a3 (USB settings)
Power Setting GUID: 48e6b7a6-50f5-4782-a5d4-53bb8f07e226 (USB selective suspend setting)
Possible Setting Index: 000
Possible Setting Friendly Name: Disabled
Possible Setting Index: 001
Possible Setting Friendly Name: Enabled
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000001
Subgroup GUID: 4f971e89-eebd-4455-a8de-9e59040e7347 (Power buttons and lid)
GUID Alias: SUB_BUTTONS
Power Setting GUID: a7066653-8d6c-40a8-910e-a1f54b84c7e5 (Start menu power button)
GUID Alias: UIBUTTON_ACTION
Possible Setting Index: 000
Possible Setting Friendly Name: Sleep
Possible Setting Index: 001
Possible Setting Friendly Name: Hibernate
Possible Setting Index: 002
Possible Setting Friendly Name: Shut down
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000000
Subgroup GUID: 501a4d13-42af-4429-9fd1-a8218c268e20 (PCI Express)
GUID Alias: SUB_PCIEXPRESS
Power Setting GUID: ee12f906-d277-404b-b6da-e5fa1a576df5 (Link State Power Management)
GUID Alias: ASPM
Possible Setting Index: 000
Possible Setting Friendly Name: Off
Possible Setting Index: 001
Possible Setting Friendly Name: Moderate power savings
Possible Setting Index: 002
Possible Setting Friendly Name: Maximum power savings
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000002
Subgroup GUID: 54533251-82be-4824-96c1-47b60b740d00 (Processor power management)
GUID Alias: SUB_PROCESSOR
Power Setting GUID: 893dee8e-2bef-41e0-89c6-b55d0929964c (Minimum processor state)
GUID Alias: PROCTHROTTLEMIN
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0x00000064
Possible Settings increment: 0x00000001
Possible Settings units: %
Current AC Power Setting Index: 0x00000005
Current DC Power Setting Index: 0x00000005
Power Setting GUID: 94d3a615-a899-4ac5-ae2b-e4d8f634367f (System cooling policy)
GUID Alias: SYSCOOLPOL
Possible Setting Index: 000
Possible Setting Friendly Name: Passive
Possible Setting Index: 001
Possible Setting Friendly Name: Active
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000000
Power Setting GUID: bc5038f7-23e0-4960-96da-33abaf5935ec (Maximum processor state)
GUID Alias: PROCTHROTTLEMAX
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0x00000064
Possible Settings increment: 0x00000001
Possible Settings units: %
Current AC Power Setting Index: 0x00000064
Current DC Power Setting Index: 0x00000064
Subgroup GUID: 7516b95f-f776-4464-8c53-06167f40cc99 (Display)
GUID Alias: SUB_VIDEO
Power Setting GUID: 3c0bc021-c8a8-4e07-a973-6b14cbcb2b7e (Turn off display after)
GUID Alias: VIDEOIDLE
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0xffffffff
Possible Settings increment: 0x00000001
Possible Settings units: Seconds
Current AC Power Setting Index: 0x0000012c
Current DC Power Setting Index: 0x0000012c
Power Setting GUID: aded5e82-b909-4619-9949-f5d71dac0bcb (Display brightness)
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0x00000064
Possible Settings increment: 0x00000001
Possible Settings units: %
Current AC Power Setting Index: 0x00000064
Current DC Power Setting Index: 0x00000028
Power Setting GUID: f1fbfde2-a960-4165-9f88-50667911ce96 (Dimmed display brightness)
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0x00000064
Possible Settings increment: 0x00000001
Possible Settings units: %
Current AC Power Setting Index: 0x00000032
Current DC Power Setting Index: 0x00000032
Power Setting GUID: fbd9aa66-9553-4097-ba44-ed6e9d65eab8 (Enable adaptive brightness)
GUID Alias: ADAPTBRIGHT
Possible Setting Index: 000
Possible Setting Friendly Name: Off
Possible Setting Index: 001
Possible Setting Friendly Name: On
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000000
Subgroup GUID: 9596fb26-9850-41fd-ac3e-f7c3c00afd4b (Multimedia settings)
Power Setting GUID: 03680956-93bc-4294-bba6-4e0f09bb717f (When sharing media)
Possible Setting Index: 000
Possible Setting Friendly Name: Allow the computer to sleep
Possible Setting Index: 001
Possible Setting Friendly Name: Prevent idling to sleep
Possible Setting Index: 002
Possible Setting Friendly Name: Allow the computer to enter Away Mode
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000000
Power Setting GUID: 10778347-1370-4ee0-8bbd-33bdacaade49 (Video playback quality bias)
Possible Setting Index: 000
Possible Setting Friendly Name: Video playback power-saving bias
Possible Setting Index: 001
Possible Setting Friendly Name: Video playback performance bias
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000000
Power Setting GUID: 34c7b99f-9a6d-4b3c-8dc7-b6693b78cef4 (When playing video)
Possible Setting Index: 000
Possible Setting Friendly Name: Optimize video quality
Possible Setting Index: 001
Possible Setting Friendly Name: Balanced
Possible Setting Index: 002
Possible Setting Friendly Name: Optimize power savings
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000001
Subgroup GUID: e73a048d-bf27-4f12-9731-8b2076e8891f (Battery)
GUID Alias: SUB_BATTERY
Power Setting GUID: 5dbb7c9f-38e9-40d2-9749-4f8a0e9f640f (Critical battery notification)
GUID Alias: BATFLAGSCRIT
Possible Setting Index: 000
Possible Setting Friendly Name: Off
Possible Setting Index: 001
Possible Setting Friendly Name: On
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000001
Power Setting GUID: 637ea02f-bbcb-4015-8e2c-a1c7b9c0b546 (Critical battery action)
GUID Alias: BATACTIONCRIT
Possible Setting Index: 000
Possible Setting Friendly Name: Do nothing
Possible Setting Index: 001
Possible Setting Friendly Name: Sleep
Possible Setting Index: 002
Possible Setting Friendly Name: Hibernate
Possible Setting Index: 003
Possible Setting Friendly Name: Shut down
Current AC Power Setting Index: 0x00000002
Current DC Power Setting Index: 0x00000002
Power Setting GUID: 8183ba9a-e910-48da-8769-14ae6dc1170a (Low battery level)
GUID Alias: BATLEVELLOW
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0x00000064
Possible Settings increment: 0x00000001
Possible Settings units: %
Current AC Power Setting Index: 0x0000000a
Current DC Power Setting Index: 0x0000000a
Power Setting GUID: 9a66d8d7-4ff7-4ef9-b5a2-5a326ca2a469 (Critical battery level)
GUID Alias: BATLEVELCRIT
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0x00000064
Possible Settings increment: 0x00000001
Possible Settings units: %
Current AC Power Setting Index: 0x00000005
Current DC Power Setting Index: 0x00000005
Power Setting GUID: bcded951-187b-4d05-bccc-f7e51960c258 (Low battery notification)
GUID Alias: BATFLAGSLOW
Possible Setting Index: 000
Possible Setting Friendly Name: Off
Possible Setting Index: 001
Possible Setting Friendly Name: On
Current AC Power Setting Index: 0x00000001
Current DC Power Setting Index: 0x00000001
Power Setting GUID: d8742dcb-3e6a-4b3c-b3fe-374623cdcf06 (Low battery action)
GUID Alias: BATACTIONLOW
Possible Setting Index: 000
Possible Setting Friendly Name: Do nothing
Possible Setting Index: 001
Possible Setting Friendly Name: Sleep
Possible Setting Index: 002
Possible Setting Friendly Name: Hibernate
Possible Setting Index: 003
Possible Setting Friendly Name: Shut down
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000000
Power Setting GUID: f3c5027d-cd16-4930-aa6b-90db844a8f00 (Reserve battery level)
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0x00000064
Possible Settings increment: 0x00000001
Possible Settings units: %
Current AC Power Setting Index: 0x00000007
Current DC Power Setting Index: 0x00000007