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D3D11: Removing Device

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hi, when porting my game frome [b]Windows 8 Store App[/b] to [b]WindowsPhone 8[/b], I encounter a error:
D3D11: Removing Device.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DB64.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DFA0.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148E0DC.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DB64.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DFA0.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148E0DC.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DB64.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DFA0.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148E0DC.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DB64.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DFA0.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148E0DC.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DB64.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DFA0.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148E0DC.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DA34.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: _com_error at memory location 0x0148DF2C.
First-chance exception at 0x77BD277C in TaskHost.exe: Microsoft C++ exception: Platform::COMException ^ at memory location 0x0148E008. HRESULT:0x887A0005

Call [b]GetDeviceRemovedReason()[/b], the return value is[b] DXGI_ERROR_DEVICE_REMOVED[/b]
besides, I use [b]Windows Phone 8 emulator[/b].

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This generally means that the display driver crashed or hung, and you got a TDR. This can be from something simple, like a draw call with a shader that uses a shader with a really long loop that takes so long that the drive times out. Or it might be from a bug in the driver itself. Or it could even be something in the emulator. The best advice I can give is to start removing bits of code until you can narrow it down further.

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thank you for your reply, MJP.
This error occurs when game init, ID3D11Device create many render states, textures, and shaders and all this is done in one game update. The error occurs some times at creating render states, some times at creating textures.

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