Add auto-detection for Intel GPU on Windows (#16280)

This PR enables `--torch-backend=auto` to automatically detect Intel
GPUs. It follows up on
[#14386](https://github.com/astral-sh/uv/pull/14386).
On Windows, detection is implemented by querying the
`Win32_VideoController` class via the [WMI
crate](https://github.com/ohadravid/wmi-rs/tree/v0.16.0).

Currently, Intel GPUs (XPU) do not depend on specific driver or toolkit
versions to determine which PyTorch wheel to use.

Cargo.lock

@@ -6714,6 +6714,7 @@ dependencies = [
  "uv-pep440",
  "uv-platform-tags",
  "uv-static",
+ "wmi",
 ]
 
 [[package]]
@@ -7470,6 +7471,20 @@ dependencies = [
  "bitflags 2.9.4",
 ]
 
+[[package]]
+name = "wmi"
+version = "0.16.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d9189bc72f0e4d814d812216ec06636ce3ea5597ff5f1ff9f9f0e5ec781c027"
+dependencies = [
+ "futures",
+ "log",
+ "serde",
+ "thiserror 2.0.17",
+ "windows 0.61.3",
+ "windows-core 0.61.2",
+]
+
 [[package]]
 name = "writeable"
 version = "0.6.1"

Cargo.toml

@@ -201,6 +201,7 @@ which = { version = "8.0.0", features = ["regex"] }
 windows = { version = "0.59.0", features = ["Win32_Globalization", "Win32_Security", "Win32_System_Console", "Win32_System_Kernel", "Win32_System_Diagnostics_Debug", "Win32_Storage_FileSystem", "Win32_System_Registry", "Win32_System_IO", "Win32_System_Ioctl"] }
 windows-registry = { version = "0.5.0" }
 wiremock = { version = "0.6.4" }
+wmi = { version = "0.16.0", default-features = false }
 xz2 = { version = "0.1.7" }
 zeroize = { version = "1.8.1" }
 zip = { version = "2.2.3", default-features = false, features = ["deflate", "zstd", "bzip2", "lzma", "xz"] }

crates/uv-torch/Cargo.toml

@@ -25,5 +25,8 @@ thiserror = { workspace = true }
 tracing = { workspace = true }
 url = { workspace = true }
 
+[target.'cfg(all(target_os = "windows"))'.dependencies]
+wmi = { workspace = true }
+
 [lints]
 workspace = true

crates/uv-torch/src/accelerator.rs

@@ -6,6 +6,11 @@ use tracing::debug;
 use uv_pep440::Version;
 use uv_static::EnvVars;
 
+#[cfg(windows)]
+use serde::Deserialize;
+#[cfg(windows)]
+use wmi::{COMLibrary, WMIConnection};
+
 #[derive(Debug, thiserror::Error)]
 pub enum AcceleratorError {
     #[error(transparent)]
@@ -60,6 +65,7 @@ impl Accelerator {
     /// 5. `nvidia-smi --query-gpu=driver_version --format=csv,noheader`.
     /// 6. `rocm_agent_enumerator`, which lists the AMD GPU architectures.
     /// 7. `/sys/bus/pci/devices`, filtering for the Intel GPU via PCI.
+    /// 8. Windows Managmeent Instrumentation (WMI), filtering for the Intel GPU via PCI.
     pub fn detect() -> Result<Option<Self>, AcceleratorError> {
         // Constants used for PCI device detection.
         const PCI_BASE_CLASS_MASK: u32 = 0x00ff_0000;
@@ -187,6 +193,50 @@ impl Accelerator {
             Err(e) => return Err(e.into()),
         }
 
+        // Detect Intel GPU via WMI on Windows
+        #[cfg(windows)]
+        {
+            #[derive(Deserialize, Debug)]
+            #[serde(rename = "Win32_VideoController")]
+            #[serde(rename_all = "PascalCase")]
+            struct VideoController {
+                #[serde(rename = "PNPDeviceID")]
+                pnp_device_id: Option<String>,
+                name: Option<String>,
+            }
+
+            match COMLibrary::new() {
+                Ok(com_library) => match WMIConnection::new(com_library) {
+                    Ok(wmi_connection) => match wmi_connection.query::<VideoController>() {
+                        Ok(gpu_controllers) => {
+                            for gpu_controller in gpu_controllers {
+                                if let Some(pnp_device_id) = &gpu_controller.pnp_device_id {
+                                    if pnp_device_id
+                                        .contains(&format!("VEN_{PCI_VENDOR_ID_INTEL:04X}"))
+                                    {
+                                        debug!(
+                                            "Detected Intel GPU from WMI: PNPDeviceID={}, Name={:?}",
+                                            pnp_device_id, gpu_controller.name
+                                        );
+                                        return Ok(Some(Self::Xpu));
+                                    }
+                                }
+                            }
+                        }
+                        Err(e) => {
+                            debug!("Failed to query WMI for video controllers: {e}");
+                        }
+                    },
+                    Err(e) => {
+                        debug!("Failed to create WMI connection: {e}");
+                    }
+                },
+                Err(e) => {
+                    debug!("Failed to initialize COM library: {e}");
+                }
+            }
+        }
+
         debug!("Failed to detect GPU driver version");
 
         Ok(None)

crates/uv-torch/src/backend.rs

@@ -466,11 +466,10 @@ impl TorchStrategy {
                 ))),
             },
             Self::Xpu { os, source } => match os {
-                Os::Manylinux { .. } => Either::Right(Either::Right(Either::Left(
+                Os::Manylinux { .. } | Os::Windows => Either::Right(Either::Right(Either::Left(
                     std::iter::once(TorchBackend::Xpu.index_url(*source)),
                 ))),
-                Os::Windows
-                | Os::Musllinux { .. }
+                Os::Musllinux { .. }
                 | Os::Macos { .. }
                 | Os::FreeBsd { .. }
                 | Os::NetBsd { .. }

docs/guides/integration/pytorch.md

@@ -460,12 +460,4 @@ $ # With an environment variable.
 $ UV_TORCH_BACKEND=cu126 uv pip install torch torchvision
 ```
 
-On Windows, Intel GPU (XPU) is not automatically selected with `--torch-backend=auto`, but you can
-manually specify it using `--torch-backend=xpu`:
-
-```shell
-$ # Manual selection for Intel GPU.
-$ uv pip install torch torchvision --torch-backend=xpu
-```
-
 At present, `--torch-backend` is only available in the `uv pip` interface.