(bug 1492871 was about PDF in the past.)

Win10, GTX1060
I made a driver update from 411.63 to 417.71.

Actual: Fallback to Basic compositing (without any crash).
Expected: WR should recover.

Attached about:support still shows the old driver version as I haven't restarted Nightly yet.

WEBRENDER:
opt-in by default: WebRender is an opt-in feature
available by user: Force enabled by pref
unavailable by runtime: Failed to render WebRender
ADVANCED_LAYERS:
failed by runtime: Failed initializing MLGDeviceD3D11

Failure Log
(#0): GP+[GFX1-]: GFX: RenderThread detected a device reset in BeginFrame
(#35): GP+[GFX1-]: wr_renderer_render: Shader(Compilation("ps_text_run", ""))
(#36): GP+[GFX1-]: wr_renderer_render: Shader(Compilation("brush_blend", ""))
(#37): GP+[GFX1-]: wr_renderer_render: Shader(Compilation("brush_solid", ""))
(#38): GP+[GFX1-]: wr_renderer_render: Shader(Compilation("brush_image", ""))
(#39): GP+[GFX1-]: wr_renderer_render: Shader(Compilation("brush_image", ""))
(#40): GP+[GFX1-]: Failed to make render context current during destroying.
(#41) Error: Compositors might be mixed (5,1)
(#42): GP+[GFX1]: Failed to create ID3D11Buffer.
(#43): GP+[GFX1-]: [D3D11] CreateInputLayout failed: 0x887a0005
(#44): GP+[GFX1-]: [D3D11] failed to get compositor device attachments
(#45): GP+[GFX1-]: [D3D11] Failed to init compositor with reason: FEATURE_FAILURE_D3D11_INPUT_LAYOUT
(#46): GP+[GFX1-]: [D3D11] failed to get compositor device attachments
(#47): GP+[GFX1-]: [D3D11] Failed to init compositor with reason: FEATURE_FAILURE_D3D11_INPUT_LAYOUT
(#48): GP+[GFX1-]: [D3D11] failed to get compositor device attachments
(#49): GP+[GFX1-]: [D3D11] Failed to init compositor with reason: FEATURE_FAILURE_D3D11_INPUT_LAYOUT

Nightly had two open tabs:

• about:config
• https://www.nvidia.com/content/DriverDownload-March2009/confirmation.php?url=/Windows/417.71/417.71-desktop-win10-64bit-international-whql.exe&lang=us&type=TITAN

Does the WebRender disabled/D3D11 layers enabled survive a driver update? Or do we fall back to basic there too?

(In reply to Jeff Muizelaar [:jrmuizel] from comment #2)

Does the WebRender disabled/D3D11 layers enabled survive a driver update? Or do we fall back to basic there too?

Direct3D 11 (Advanced Layers) did not fall back to Basic.
With WebRender force-disabled:

Description: NVIDIA GeForce GTX 1060 3GB
Vendor ID: 0x10de
Device ID: 0x1c02
Driver Version: 25.21.14.1771
Driver Date: 1-11-2019

Failure Log
(#0) GP+[GFX1-]: GFX: AL_D3D11 abandoned sync
(#1) GP+[GFX1-]: GFX: D3D11 detected a device reset in Present
(#2) GP+[GFX1-]: D3D11 swap chain failed to present: 0x887a0005

Displayed driver version was not updated by F5. After restarting Nightly:

Driver Version: 25.21.14.1881
Driver Date: 1-30-2019

Win10 1809

Updated from

Description: NVIDIA GeForce GTX 1060 3GB
Vendor ID: 0x10de
Device ID: 0x1c02
Driver Version: 25.21.14.1881
Driver Date: 1-30-2019

to

Driver Version: 25.21.14.1967
Driver Date: 3-17-2019

and did not encounter a fallback to Basic compositing.