diff --git a/libs/ui/DisplayIdentification.cpp b/libs/ui/DisplayIdentification.cpp
index c9f0761..ee38f50 100644
--- a/libs/ui/DisplayIdentification.cpp
+++ b/libs/ui/DisplayIdentification.cpp
@@ -392,10 +392,6 @@
     return a && b && c ? std::make_optional(PnpId{a, b, c}) : std::nullopt;
 }
 
-std::optional<PnpId> getPnpId(PhysicalDisplayId displayId) {
-    return getPnpId(displayId.getManufacturerId());
-}
-
 std::optional<DisplayIdentificationInfo> parseDisplayIdentificationData(
         uint8_t port, const DisplayIdentificationData& data) {
     if (data.empty()) {
diff --git a/libs/ui/include/ui/DisplayId.h b/libs/ui/include/ui/DisplayId.h
index 5614e43..9ea6cec 100644
--- a/libs/ui/include/ui/DisplayId.h
+++ b/libs/ui/include/ui/DisplayId.h
@@ -97,7 +97,6 @@
     // TODO(b/162612135) Remove default constructor
     PhysicalDisplayId() = default;
 
-    constexpr uint16_t getManufacturerId() const { return static_cast<uint16_t>(value >> 40); }
     constexpr uint8_t getPort() const { return static_cast<uint8_t>(value); }
 
 private:
diff --git a/libs/ui/include/ui/DisplayIdentification.h b/libs/ui/include/ui/DisplayIdentification.h
index cdac269..5883dba 100644
--- a/libs/ui/include/ui/DisplayIdentification.h
+++ b/libs/ui/include/ui/DisplayIdentification.h
@@ -85,7 +85,6 @@
 bool isEdid(const DisplayIdentificationData&);
 std::optional<Edid> parseEdid(const DisplayIdentificationData&);
 std::optional<PnpId> getPnpId(uint16_t manufacturerId);
-std::optional<PnpId> getPnpId(PhysicalDisplayId);
 
 std::optional<DisplayIdentificationInfo> parseDisplayIdentificationData(
         uint8_t port, const DisplayIdentificationData&);
diff --git a/libs/ui/tests/DisplayId_test.cpp b/libs/ui/tests/DisplayId_test.cpp
index a49bb04..090d2ee 100644
--- a/libs/ui/tests/DisplayId_test.cpp
+++ b/libs/ui/tests/DisplayId_test.cpp
@@ -26,7 +26,6 @@
     constexpr uint32_t modelHash = 42;
     const PhysicalDisplayId id = PhysicalDisplayId::fromEdid(port, manufacturerId, modelHash);
     EXPECT_EQ(port, id.getPort());
-    EXPECT_EQ(manufacturerId, id.getManufacturerId());
     EXPECT_FALSE(VirtualDisplayId::tryCast(id));
     EXPECT_FALSE(HalVirtualDisplayId::tryCast(id));
     EXPECT_FALSE(GpuVirtualDisplayId::tryCast(id));
diff --git a/libs/ui/tests/DisplayIdentification_test.cpp b/libs/ui/tests/DisplayIdentification_test.cpp
index d1699e7..fdcf112 100644
--- a/libs/ui/tests/DisplayIdentification_test.cpp
+++ b/libs/ui/tests/DisplayIdentification_test.cpp
@@ -462,18 +462,6 @@
     }
 }
 
-TEST(DisplayIdentificationTest, fromPort) {
-    // Manufacturer ID should be invalid.
-    ASSERT_FALSE(getPnpId(PhysicalDisplayId::fromPort(0)));
-    ASSERT_FALSE(getPnpId(PhysicalDisplayId::fromPort(0xffu)));
-}
-
-TEST(DisplayIdentificationTest, getVirtualDisplayId) {
-    // Manufacturer ID should be invalid.
-    ASSERT_FALSE(getPnpId(getVirtualDisplayId(0)));
-    ASSERT_FALSE(getPnpId(getVirtualDisplayId(0xffff'ffffu)));
-}
-
 } // namespace android
 
 // TODO(b/129481165): remove the #pragma below and fix conversion issues