diff --git a/playwright.config.ts b/playwright.config.ts
index b96ad57..a3ffb8d 100644
--- a/playwright.config.ts
+++ b/playwright.config.ts
@@ -2,13 +2,13 @@ import { defineConfig } from "@playwright/test";
 
 const args = ["--enable-unsafe-webgpu"];
 const features = ["WebMCP"];
-if (process.platform !== "darwin") {
+if (process.platform === "win32") {
   args.push("--use-webgpu-adapter=swiftshader");
 }
 if (process.platform === "linux") {
-  // Vulkan enables image transfers; ANGLE's SwiftShader path presents canvases in headless Chromium.
+  // ANGLE on Vulkan gives headless Chromium the machine's GPU for WebGPU and canvases.
   features.push("Vulkan");
-  args.push("--use-angle=swiftshader", "--use-vulkan=swiftshader");
+  args.push("--use-angle=vulkan");
 }
 args.push(`--enable-features=${features.join(",")}`);
 
diff --git a/tests/editing.e2e.ts b/tests/editing.e2e.ts
index b33beef..8aa0279 100644
--- a/tests/editing.e2e.ts
+++ b/tests/editing.e2e.ts
@@ -7,6 +7,7 @@ import { box, choose, drag, zoom } from "./pointer";
 test("edit a photo, inspect the preview and histograms, undo changes, and export", async ({
   page,
 }) => {
+  test.setTimeout(90_000);
   const state = () => page.evaluate(() => window.openlight.getState());
   await openPhoto(page);
   const canvas = page
@@ -291,11 +292,12 @@ test("edit a photo, inspect the preview and histograms, undo changes, and export
     // A neutral mask receives the same pixels, counted only where it covers them.
     await expect(plot).toHaveAttribute("points", /,\d{1,2}\./);
     await expect(plot).not.toHaveAttribute("points", whole);
+    const neutral = (await plot.getAttribute("points")) ?? "";
     await page.evaluate(
       (mask) => window.openlight.setAdjustments({ exposure: 1 }, mask),
       mask,
     );
-    await expect(plot).toHaveAttribute("points", /,\d{1,2}\./);
+    await expect(plot).not.toHaveAttribute("points", neutral);
     const points = (await plot.getAttribute("points")) ?? "";
     await page
       .getByRole("button", { name: "Show Curve input mask", exact: true })