TDR Registry Keys

You can use the following TDR-related registry keys for testing or debugging purposes only. That is, they should not be manipulated by any applications outside targeted testing or debugging.

  • TdrLevel

    Specifies the initial level of recovery. The default value is to recover on timeout (TdrLevelRecover).

    
    KeyPath   : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
    KeyValue  : TdrLevel
    ValueType : REG_DWORD
    ValueData : TdrLevelOff (0) - Detection disabled 
     TdrLevelBugcheck (1) - Bug check on detected timeout, for example, no recovery.
     TdrLevelRecoverVGA (2) - Recover to VGA (not implemented).
     TdrLevelRecover (3) - Recover on timeout. This is the default value.
    
    
  • TdrDelay

    Specifies the number of seconds that the GPU can delay the preempt request from the GPU scheduler. This is effectively the timeout threshold. The default value is 2 seconds.

    
    KeyPath   : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
    KeyValue  : TdrDelay
    ValueType : REG_DWORD
    ValueData : Number of seconds to delay. 2 seconds is the default value.
    
    
  • TdrDdiDelay

    Specifies the number of seconds that the operating system allows threads to leave the driver. After a specified time, the operating system bug-checks the computer with the code VIDEO_TDR_FAILURE (0x116). The default value is 5 seconds.

    
    KeyPath   : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
    KeyValue  : TdrDdiDelay
    ValueType : REG_DWORD
    ValueData : Number of seconds to leave the driver. 5 seconds is the default value.
    
    
  • TdrTestMode

    Reserved. Do not use.

    
    KeyPath   : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
    KeyValue  : TdrTestMode
    ValueType : REG_DWORD
    ValueData : Do not use.
    
    
  • TdrDebugMode

    Specifies the debugging-related behavior of the TDR process. The default value is TDR_DEBUG_MODE_RECOVER_NO_PROMPT, which indicates not to break into the debugger.

    
    KeyPath   : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
    KeyValue  : TdrDebugMode
    ValueType : REG_DWORD
    ValueData : TDR_DEBUG_MODE_OFF (0) - Break to kernel debugger before the recovery to allow investigation of the timeout. 
     TDR_DEBUG_MODE_IGNORE_TIMEOUT (1) - Ignore any timeout.
     TDR_DEBUG_MODE_RECOVER_NO_PROMPT (2) - Recover without breaking into the debugger. This is the default value.
     TDR_DEBUG_MODE_RECOVER_UNCONDITIONAL (3) - Recover even if some recovery conditions are not met (for example, recover on consecutive timeouts).
    
    
  • TdrLimitTime

    Supported in Windows Server 2008 and later versions, and Windows Vista with Service Pack 1 (SP1) and later versions.

    Specifies the default time within which a specific number of TDRs (specified by the TdrLimitCount key) are allowed without crashing the computer. The default value is 60 seconds.

    
    KeyPath   : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
    KeyValue  : TdrLimitTime
    ValueType : REG_DWORD
    ValueData : Number of seconds before crashing. 60 seconds is the default value.
    
    
  • TdrLimitCount

    Supported in Windows Server 2008 and later versions, and Windows Vista with Service Pack 1 (SP1) and later versions.

    Specifies the default number of TDRs (0x117) that are allowed during the time specified by the TdrLimitTime key without crashing the computer. The default value is 5.

    
    KeyPath   : HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\GraphicsDrivers
    KeyValue  : TdrLimitCount
    ValueType : REG_DWORD
    ValueData : Number of TDRs before crashing. The default value is 5.
    
    

 

 

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