diff --git a/python/sglang/multimodal_gen/test/server/gpu_cases.py b/python/sglang/multimodal_gen/test/server/gpu_cases.py
index b79e3f816..b3181870a 100644
--- a/python/sglang/multimodal_gen/test/server/gpu_cases.py
+++ b/python/sglang/multimodal_gen/test/server/gpu_cases.py
@@ -1064,13 +1064,39 @@ ONE_GPU_5090_CASES = _select_5090_canary_cases(ONE_GPU_5090_CANARY_CASE_IDS)
 ONE_GPU_5090_CASES.append(_make_5090_flux_layerwise_cpu_offload_case())
 
 
+# Nested unit/ tests verified to pass on AMD/ROCm as-is (no code change).
+# Enabled incrementally and AMD-only: the CUDA `multimodal-gen-unit-test`
+# lane keeps the flat glob below. Files that still need fixes/skips are added
+# in follow-up PRs. Paths are relative to the unit/ dir.
+_AMD_READY_NESTED_UNIT_TESTS = (
+    "realtime/test_causal_denoising.py",
+    "realtime/test_output_materialization.py",
+    "realtime/test_realtime_consistency_harness.py",
+    "realtime/test_realtime_control_signals.py",
+    "realtime/test_realtime_output_transport.py",
+    "realtime/test_realtime_vae.py",
+    "sana_wm/test_streaming_cached.py",
+    "sana_wm/test_streaming_stage.py",
+    "sana_wm/test_streaming_vae.py",
+)
+
+
 def _discover_unit_tests() -> list[str]:
     unit_dir = Path(__file__).resolve().parent.parent / "unit"
     if not unit_dir.is_dir():
         return []
-    return sorted(
-        f"../unit/{f.name}" for f in unit_dir.glob("test_*.py") if f.is_file()
-    )
+    # Flat unit/ tests run on every lane (unchanged). This keeps the CUDA
+    # `multimodal-gen-unit-test` job byte-identical.
+    flat = [f"../unit/{f.name}" for f in unit_dir.glob("test_*.py") if f.is_file()]
+    if not current_platform.is_hip():
+        return sorted(flat)
+    # AMD/ROCm additionally runs the vetted nested-subdir tests.
+    nested = [
+        f"../unit/{rel}"
+        for rel in _AMD_READY_NESTED_UNIT_TESTS
+        if (unit_dir / rel).is_file()
+    ]
+    return sorted(flat + nested)
 
 
 FILE_SUITES = {
diff --git a/scripts/ci/utils/ci_coverage_report.py b/scripts/ci/utils/ci_coverage_report.py
index e8a467ad8..918fcd5a6 100755
--- a/scripts/ci/utils/ci_coverage_report.py
+++ b/scripts/ci/utils/ci_coverage_report.py
@@ -75,8 +75,11 @@ _MM_GEN_SUBDIR_BACKENDS = {
     # CUDA-only for now (previously matched no rule and were dropped entirely).
     "single_test_file": ("CUDA",),
     "single_test_file/component_accuracy": ("CUDA",),
-    # Nested unit suites run only on the CUDA lane today (they are not part of
-    # the AMD `unit` suite that multimodal-gen-unit-test-amd executes).
+    # Nested unit suites are enabled on AMD incrementally, per file (only the
+    # files that pass on ROCm as-is; see _MM_GEN_FILE_BACKENDS below and
+    # gpu_cases _AMD_READY_NESTED_UNIT_TESTS). The subdir default stays the
+    # pre-existing CUDA tag for files not yet enabled on AMD (follow-up PRs
+    # move each file to AMD as it lands).
     "unit/realtime": ("CUDA",),
     "unit/sana_wm": ("CUDA",),
     "unit/progressive_resolution": ("CUDA",),
@@ -84,6 +87,22 @@ _MM_GEN_SUBDIR_BACKENDS = {
     "unit/musa/layers": ("MUSA",),
 }
 
+# Per-file backend overrides (checked before the subdir rule). Used to enable
+# individual nested unit/ files on AMD incrementally, as each is verified to
+# pass on ROCm. The CUDA lane does not collect these nested files (see
+# gpu_cases._discover_unit_tests), so they are AMD-only here.
+_MM_GEN_FILE_BACKENDS = {
+    "unit/realtime/test_causal_denoising.py": ("AMD",),
+    "unit/realtime/test_output_materialization.py": ("AMD",),
+    "unit/realtime/test_realtime_consistency_harness.py": ("AMD",),
+    "unit/realtime/test_realtime_control_signals.py": ("AMD",),
+    "unit/realtime/test_realtime_output_transport.py": ("AMD",),
+    "unit/realtime/test_realtime_vae.py": ("AMD",),
+    "unit/sana_wm/test_streaming_cached.py": ("AMD",),
+    "unit/sana_wm/test_streaming_stage.py": ("AMD",),
+    "unit/sana_wm/test_streaming_vae.py": ("AMD",),
+}
+
 # Filenames that match `test_*.py` by convention but contain no real tests
 # (utility / fixture modules). Skipped before classification.
 _MM_GEN_HELPER_FILENAMES = frozenset({"test_utils.py"})
@@ -147,11 +166,14 @@ def collect_multimodal_gen_tests(
         stem_tokens = set(filename_only[:-3].split("_"))
         nightly = "nightly" in stem_tokens
 
-        backends: tuple[str, ...] = ()
-        for token, override in _MM_GEN_FILENAME_BACKEND_TOKENS.items():
-            if token in stem_tokens:
-                backends = override
-                break
+        # Precedence: explicit per-file override, then filename token, then
+        # the subdir default.
+        backends: tuple[str, ...] = _MM_GEN_FILE_BACKENDS.get(rel.as_posix(), ())
+        if not backends:
+            for token, override in _MM_GEN_FILENAME_BACKEND_TOKENS.items():
+                if token in stem_tokens:
+                    backends = override
+                    break
         if not backends:
             backends = _MM_GEN_SUBDIR_BACKENDS.get(subdir, ())