Tommy Lahitte
Debugging

Restart Your Graphics Driver Without Rebooting

When Unreal hangs your GPU or your display goes black, you can recover in seconds with no reboot. The Windows keyboard shortcut Win+Ctrl+Shift+B restarts the graphics driver on the fly.

gpugraphics-driverwindowscrash-recovery

Working with Unreal, especially in nDisplay or with heavy shader compilation, can occasionally lock up the GPU. Before reaching for the power button, try the built-in Windows recovery shortcut.

The Shortcut

Win + Ctrl + Shift + B: the screen briefly flickers and you hear a beep. Everything recovers immediately.

What It Does

  • Signals Windows to reset the GPU driver stack (WDDM reset)
  • The display goes black for ~1 second, then returns to normal
  • Running applications are not killed; Unreal Editor stays open
  • Safe to use repeatedly; no known side effects

When to Use It

  • Display goes black or freezes after a GPU crash in Unreal
  • Artifacts appear on screen after a TDR (Timeout Detection and Recovery) event
  • Driver gets into a bad state after a shader compile spike
  • Any time the display is unresponsive but the machine is still running

This trick has saved me from a full reboot more times than I can count during nDisplay testing sessions. It works on all Windows 10/11 machines regardless of GPU vendor.

Related Tips

Increase the GPU TDR Delay for Long Render Operations

Windows kills the GPU after 2 seconds of no response by default (TDR). Unreal operations like heavy shader compilation or DDC filling can easily exceed that. A quick registry edit raises the limit and prevents spurious GPU resets.

DX12 Launch Arguments for GPU Crash Debugging

When Unreal crashes on the GPU side with no useful callstack, two launch arguments (-d3ddebug and -gpucrashdebugging) enable the D3D validation layer and NVIDIA Aftermath/Breadcrumbs to capture the exact operation that caused the crash.

Fix Windows Long File Path Errors in Unreal Projects

Windows enforces a 260-character path limit by default. Unreal projects, especially with nested content folders, frequently exceed this. A one-line registry change and an Editor Preferences toggle permanently resolve MAX_PATH errors.