Timeout Detection and Recovery: Difference between revisions

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{{Short description|Windows operating system feature}}

'''Timeout Detection and Recovery''' or '''TDR''' is a feature of the [[Windows]] [[operating system]] (OS) introduced in [[Windows Vista]]. It detects response problems from a [[graphics card]] (GPU), and if a [[Timeout (computing)|timeout]] occurs, the OS will attempt a card reset to recover a functional and responsive [[desktop environment]]. However, if the attempt was unsuccessful, it results in the [[Blue Screen of Death]] (BSOD). The recovery tries to mitigate the scenario where an end user superfluously reboots their device should it become unresponsive.<ref name=ms>{{Cite web|url=https://docs.microsoft.com/en-us/windows-hardware/drivers/display/timeout-detection-and-recovery|title=Timeout detection and recovery (TDR) - Windows drivers|author=[[Microsoft]]|access-date=2022-03-23}}</ref>

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Once the timeout is up and the task is not completed or preempted, the [[Kernel (operating system)|kernel]] determines that the GPU is frozen and proceeds to inform the respective driver about the detected timeout. It is then the driver's responsibility to properly reset and reinitialize the underlying GPU.<ref name=ms/><ref name=ms2/>

The OS will then do a bunch of other recovery steps needed for the system to regain responsiveness. If the entire operation was successful, the end user might see some visual artefactsartifacts and a message will be shown on the screen describing what had happened (''"Display driver stopped responding and has recovered."''), else a BSOD might ensue.<ref name=ms/><ref name=ms2/>

==Possible causes==

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==BSOD stop codes==

Possible BSOD stop codes emitted if the attempted recovery failed:

* VIDEO_TDR_FAILURE (Bug check value: 0x116), recovery and resetting of display driver from a TDR timeout failed.<ref name=ms2/><ref>{{Cite web|url=https://www.howto-connect.com/blue-screen-of-death-windows-10-error-codes-list-bsod/|title=Blue Screen of Death Windows 11 and 10 Error Codes List [BSOD]|date=11 February 2020 |access-date=2022-03-23}}</ref>

==See also==

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* [https://learn.microsoft.com/en-us/windows-hardware/drivers/display/tdr-changes-in-windows-8 TDR in Windows 8 and later - Windows drivers | Microsoft Learn]

* [https://learn.microsoft.com/en-us/windows-hardware/drivers/display/thread-synchronization-and-tdr Thread Synchronization and TDR - Windows drivers | Microsoft Learn]

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[[Category:Microsoft Windows]]

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