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Windows

When entering S3/S4, GFX receives D0 request

What is the D0? Set BP on our handler, and filter by cond BP for set power state 12: kd> bl 0 e Disable Clear fffff802`7b359020 000

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0x133.0 NPU Line Interrupt

The BSOD sequence of event looks like this:OS is starting up NPU device.Something w

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Self-Signed WHQL Certificate for Testing

Root Certificate $params = @{ Type = 'Custom' SerialNumber = '28cc3a25bfba44ac449a9b586b4339aa' KeyAlgorithm = 'RSA' HashAlgo

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0x19C.50 WuReject PostT7Delay

In dce110_edp_backlight_control, we request a wait of "post_T7_delay". This wait was n

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NT Wait Times

NT Wait Time OS store shared data as nt!_KUSER_SHARED_DATA . It is always mapped to 0xfffff78000000000 in all process. It is done through page t

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WinDbg System Uptime

Trace print code of “System Uptime” unicode string. 0:007> !for_each_module s-u @#Base @#End "System Uptime" 00007ffe`d8ec8e30 0053 0079 0073

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0x9F.3 Gfx Stuck Cause Acp PoIrp Timeout

5: kd> .bugcheck Bugcheck code 0000009F Arguments 00000000`00000003 ffffcf07`04d3caf0 ffffcd04`6bb4f010 ffffcf07`0dec88a0 9: kd> k # Child-SP

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0x19C.50 Lid

2: kd> .bugcheck Bugcheck code 0000019C Arguments 00000000`00000050 ffffbf87`de64a3c0 00000000`00000000 00000000`000000002: kd> !thread

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0x0 Live Lid Close Open Screen Dim

Symptom The display dims automatically 5s after lid close → open. Issue occurs only on SKUs with ToF sensor (HPD). Display Connect a live syste

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0x50 AcpBt EBox Plug In

Issue Description Repro step:Boot system without EBOX connected normally connect EBOX with RTX3060 Wait 5s System BSODIssue CND if

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0x0 Live AcpWdfWorkItem Leak

Customer observed higher memory usage after using Edge to play music overnight. Captured live dump after playing music for a while. 0: kd> !p

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WDF

WDF is object based, the objects have to be created and manipulated by function calls to WDF itself. WDF objects are used by handles! Not their ptr t

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Rundown Protection

Acquire with nt!ExAcquireRundownProtection. 0: kd> uf fffff802`148c8d80 nt!ExAcquireRundownProtection [minkernel\ntos\ex\rundown.c @ 333]: 3

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Recursively Debug User-Mode Child Process

When you enable “debug child process” in WinDbg, it only attempts to debug the children. 0:000> sxe -c ".childdbg 1;bu wlanapi!WlanQueryInterfac

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0x9F.3 Strix S4

5: kd> .bugcheck Bugcheck code 0000009F Arguments 00000000`00000003 ffff800f`943e4360 ffffc906`fbaa7178 ffff800f`a4a6c7505: kd> !irp ffff

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!pte "Levels not implemented for this platform"

!pte command comes from extension kdexts.dll, which is bundled with debuggers for Windows package. The command performs machine type check with t

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Power IRP Source

All Windows drivers / component / internally dispatch Power IRP with the routine. 0: kd> dt nt!PoRequestPowerIrp PoRequestPowerIrp long ( _D

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0x133.1 3xW6400 PBR

0: kd> .bugcheck Bugcheck code 00000133 Arguments 00000000`00000001 00000000`00001e00 fffff807`0a91c340 00000000`000000000: kd> !corelis

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DISPATCHER_HEADER

See DISPATCHER_HEADER (geoffchappell.com)

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0x9F.3 Strix Stress ACP

6: kd> .bugcheck Bugcheck code 0000009F Arguments 00000000`00000003 ffff948f`e9be4060 ffffe381`3d0ef040 ffff948f`ee90eba06: kd> !addrMap

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0x19C.50 Stx S3S4Restart

6: kd> .bugcheck Bugcheck code 0000019C Arguments 00000000`00000050 ffff800b`a18fa380 00000000`00000000 00000000`000000006: kd> .thread

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0x19C.50 Stx S4 Resume Video Playing

5: kd> .bugcheck Bugcheck code 0000019C Arguments 00000000`00000050 ffff808e`23621380 00000000`00000000 00000000`000000005: kd> !thread

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Session Space

When debugging Windows kernels, sometimes you see addresses that “looks” like kernel space memory. It begins with 0xffff, resides within module presen

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