diff --git a/IntelPresentMon/ControlLib/ControlLib.vcxproj b/IntelPresentMon/ControlLib/ControlLib.vcxproj
index 2b22cf10..d358dde7 100644
--- a/IntelPresentMon/ControlLib/ControlLib.vcxproj
+++ b/IntelPresentMon/ControlLib/ControlLib.vcxproj
@@ -116,6 +116,7 @@
     <ClInclude Include="adl\AdlTelemetryProvider.h" />
     <ClInclude Include="DllModule.h" />
     <ClInclude Include="Exceptions.h" />
+    <ClInclude Include="igcl\IgclControlLibCompatibility.h" />
     <ClInclude Include="igcl\IgclErrorCodeProvider.h" />
     <ClInclude Include="igcl\igcl_api.h" />
     <ClInclude Include="Logging.h" />
@@ -144,6 +145,7 @@
     <ClCompile Include="adl\Adl2Wrapper.cpp" />
     <ClCompile Include="adl\AdlTelemetryProvider.cpp" />
     <ClCompile Include="igcl\cApiWrapper.cpp" />
+    <ClCompile Include="igcl\IgclControlLibCompatibility.cpp" />
     <ClCompile Include="igcl\IgclErrorCodeProvider.cpp" />
     <ClCompile Include="igcl\IgclTelemetryProvider.cpp" />
     <ClCompile Include="nvapi\NvapiWrapper.cpp" />
diff --git a/IntelPresentMon/ControlLib/ControlLib.vcxproj.filters b/IntelPresentMon/ControlLib/ControlLib.vcxproj.filters
index c531d96b..16431c77 100644
--- a/IntelPresentMon/ControlLib/ControlLib.vcxproj.filters
+++ b/IntelPresentMon/ControlLib/ControlLib.vcxproj.filters
@@ -70,6 +70,9 @@
     <ClInclude Include="TelemetryDeviceFingerprint.h" />
     <ClInclude Include="TelemetryProvider.h" />
     <ClInclude Include="EndpointCache.h" />
+    <ClInclude Include="igcl\IgclControlLibCompatibility.h">
+      <Filter>Intel</Filter>
+    </ClInclude>
     <ClInclude Include="igcl\IgclTelemetryProvider.h">
       <Filter>Intel</Filter>
     </ClInclude>
@@ -117,6 +120,9 @@
     <ClCompile Include="adl\AdlTelemetryProvider.cpp">
       <Filter>Adl</Filter>
     </ClCompile>
+    <ClCompile Include="igcl\IgclControlLibCompatibility.cpp">
+      <Filter>Intel</Filter>
+    </ClCompile>
     <ClCompile Include="igcl\IgclTelemetryProvider.cpp">
       <Filter>Intel</Filter>
     </ClCompile>
diff --git a/IntelPresentMon/ControlLib/igcl/IgclControlLibCompatibility.cpp b/IntelPresentMon/ControlLib/igcl/IgclControlLibCompatibility.cpp
new file mode 100644
index 00000000..2d7907cb
--- /dev/null
+++ b/IntelPresentMon/ControlLib/igcl/IgclControlLibCompatibility.cpp
@@ -0,0 +1,257 @@
+// Copyright (C) 2026 Intel Corporation
+// SPDX-License-Identifier: MIT
+#include "IgclControlLibCompatibility.h"
+
+#include "../Logging.h"
+
+// Per-GPU ControlApiPath values are read from each present DISPLAY adapter
+// driver registry key (SetupDi DIREG_DRV), analogous to indexed
+// IDeviceConfigFactory GPU enumeration in the shared C# helper.
+
+#include <Windows.h>
+#include <SetupAPI.h>
+#include <devguid.h>
+
+#include <cstddef>
+#include <filesystem>
+#include <optional>
+#include <string>
+#include <vector>
+
+#pragma comment(lib, "setupapi.lib")
+#pragma comment(lib, "version.lib")
+
+namespace pmon::tel::igcl
+{
+    namespace
+    {
+        constexpr wchar_t kControlApiPathValueName[] = L"ControlApiPath";
+
+        bool IsPreHotfixControlLibVersion_(ControlLibFileVersion version) noexcept
+        {
+            if (version.major < 1) {
+                return true;
+            }
+            if (version.major > 1) {
+                return false;
+            }
+
+            if (version.minor < 2) {
+                return true;
+            }
+            if (version.minor > 2) {
+                return false;
+            }
+
+            if (version.build > 269) {
+                return false;
+            }
+            if (version.build < 269) {
+                return true;
+            }
+            return version.privatePart < 269;
+        }
+
+        bool IsZesInitOnlyControlLibVersion_(ControlLibFileVersion version) noexcept
+        {
+            if (version.major > 1) {
+                return true;
+            }
+            return version.major == 1 && version.minor >= 3;
+        }
+
+        std::optional<std::wstring> ReadRegistryStringValue_(HKEY key, const wchar_t* valueName)
+        {
+            DWORD valueType = 0;
+            DWORD bufferBytes = 0;
+            const LSTATUS sizeStatus = RegQueryValueExW(
+                key,
+                valueName,
+                nullptr,
+                &valueType,
+                nullptr,
+                &bufferBytes);
+            if (sizeStatus != ERROR_SUCCESS || bufferBytes == 0) {
+                return std::nullopt;
+            }
+            if (valueType != REG_SZ && valueType != REG_EXPAND_SZ) {
+                return std::nullopt;
+            }
+
+            std::wstring value;
+            value.resize((size_t)bufferBytes / sizeof(wchar_t));
+            const LSTATUS readStatus = RegQueryValueExW(
+                key,
+                valueName,
+                nullptr,
+                &valueType,
+                reinterpret_cast<LPBYTE>(value.data()),
+                &bufferBytes);
+            if (readStatus != ERROR_SUCCESS) {
+                return std::nullopt;
+            }
+
+            while (!value.empty() && value.back() == L'\0') {
+                value.pop_back();
+            }
+            if (value.empty()) {
+                return std::nullopt;
+            }
+
+            if (valueType == REG_EXPAND_SZ) {
+                const DWORD expandedChars = ExpandEnvironmentStringsW(value.c_str(), nullptr, 0);
+                if (expandedChars == 0) {
+                    return std::nullopt;
+                }
+                std::wstring expanded;
+                expanded.resize((size_t)expandedChars);
+                if (ExpandEnvironmentStringsW(value.c_str(), expanded.data(), expandedChars) == 0) {
+                    return std::nullopt;
+                }
+                while (!expanded.empty() && expanded.back() == L'\0') {
+                    expanded.pop_back();
+                }
+                value = std::move(expanded);
+            }
+
+            return value;
+        }
+
+        std::optional<ControlLibFileVersion> TryReadPeFileVersion_(const std::wstring& path)
+        {
+            DWORD handle = 0;
+            const DWORD infoSize = GetFileVersionInfoSizeW(path.c_str(), &handle);
+            if (infoSize == 0) {
+                return std::nullopt;
+            }
+
+            std::vector<std::byte> infoBuffer((size_t)infoSize);
+            if (!GetFileVersionInfoW(path.c_str(), 0, infoSize, infoBuffer.data())) {
+                return std::nullopt;
+            }
+
+            VS_FIXEDFILEINFO* pFileInfo = nullptr;
+            UINT fileInfoLength = 0;
+            if (!VerQueryValueW(
+                    infoBuffer.data(),
+                    L"\\",
+                    reinterpret_cast<LPVOID*>(&pFileInfo),
+                    &fileInfoLength)
+                || pFileInfo == nullptr) {
+                return std::nullopt;
+            }
+
+            ControlLibFileVersion version{};
+            version.major = HIWORD(pFileInfo->dwFileVersionMS);
+            version.minor = LOWORD(pFileInfo->dwFileVersionMS);
+            version.build = HIWORD(pFileInfo->dwFileVersionLS);
+            version.privatePart = LOWORD(pFileInfo->dwFileVersionLS);
+            return version;
+        }
+
+        std::optional<std::vector<ControlLibFileVersion>> CollectControlLibFileVersionsFromRegistry_()
+        {
+            std::vector<ControlLibFileVersion> versions;
+
+            const HDEVINFO deviceInfoSet = SetupDiGetClassDevsW(
+                &GUID_DEVCLASS_DISPLAY,
+                nullptr,
+                nullptr,
+                DIGCF_PRESENT);
+            if (deviceInfoSet == INVALID_HANDLE_VALUE) {
+                return std::nullopt;
+            }
+
+            SP_DEVINFO_DATA deviceInfoData{};
+            deviceInfoData.cbSize = sizeof(deviceInfoData);
+
+            for (DWORD deviceIndex = 0;; ++deviceIndex) {
+                if (!SetupDiEnumDeviceInfo(deviceInfoSet, deviceIndex, &deviceInfoData)) {
+                    if (GetLastError() == ERROR_NO_MORE_ITEMS) {
+                        break;
+                    }
+                    SetupDiDestroyDeviceInfoList(deviceInfoSet);
+                    return std::nullopt;
+                }
+
+                const HKEY driverKey = SetupDiOpenDevRegKey(
+                    deviceInfoSet,
+                    &deviceInfoData,
+                    DICS_FLAG_GLOBAL,
+                    0,
+                    DIREG_DRV,
+                    KEY_READ);
+                if (driverKey == INVALID_HANDLE_VALUE) {
+                    continue;
+                }
+
+                const auto controlApiPath = ReadRegistryStringValue_(driverKey, kControlApiPathValueName);
+                RegCloseKey(driverKey);
+                if (!controlApiPath.has_value()) {
+                    continue;
+                }
+
+                std::error_code fsError;
+                if (!std::filesystem::exists(*controlApiPath, fsError)) {
+                    continue;
+                }
+
+                const auto fileVersion = TryReadPeFileVersion_(*controlApiPath);
+                if (fileVersion.has_value()) {
+                    versions.push_back(*fileVersion);
+                }
+            }
+
+            SetupDiDestroyDeviceInfoList(deviceInfoSet);
+            return versions;
+        }
+    }
+
+    bool IsPreHotfixControlLibVersion(ControlLibFileVersion version) noexcept
+    {
+        return IsPreHotfixControlLibVersion_(version);
+    }
+
+    bool IsZesInitOnlyControlLibVersion(ControlLibFileVersion version) noexcept
+    {
+        return IsZesInitOnlyControlLibVersion_(version);
+    }
+
+    bool IsControlLibVersionMismatch(std::span<const ControlLibFileVersion> versions) noexcept
+    {
+        bool hasPreHotfix = false;
+        bool hasZesInitOnly = false;
+        for (const ControlLibFileVersion& version : versions) {
+            if (IsPreHotfixControlLibVersion_(version)) {
+                hasPreHotfix = true;
+            }
+            if (IsZesInitOnlyControlLibVersion_(version)) {
+                hasZesInitOnly = true;
+            }
+            if (hasPreHotfix && hasZesInitOnly) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    bool AreIgclControlLibsMismatched() noexcept
+    {
+        try {
+            const auto versions = CollectControlLibFileVersionsFromRegistry_();
+            if (!versions.has_value()) {
+                pmlog_warn("IGCL control library compatibility check could not enumerate display adapters; skipping ctlInit");
+                return true;
+            }
+            if (IsControlLibVersionMismatch(*versions)) {
+                pmlog_warn("Mixed IGCL control library versions detected across GPUs; skipping ctlInit");
+                return true;
+            }
+            return false;
+        }
+        catch (...) {
+            pmlog_warn("IGCL control library compatibility check failed; skipping ctlInit");
+            return true;
+        }
+    }
+}
diff --git a/IntelPresentMon/ControlLib/igcl/IgclControlLibCompatibility.h b/IntelPresentMon/ControlLib/igcl/IgclControlLibCompatibility.h
new file mode 100644
index 00000000..81f2e2b8
--- /dev/null
+++ b/IntelPresentMon/ControlLib/igcl/IgclControlLibCompatibility.h
@@ -0,0 +1,29 @@
+// Copyright (C) 2026 Intel Corporation
+// SPDX-License-Identifier: MIT
+#pragma once
+
+#include <cstdint>
+#include <span>
+#include <vector>
+
+namespace pmon::tel::igcl
+{
+    struct ControlLibFileVersion
+    {
+        uint16_t major = 0;
+        uint16_t minor = 0;
+        uint16_t build = 0;
+        uint16_t privatePart = 0;
+    };
+
+    bool IsPreHotfixControlLibVersion(ControlLibFileVersion version) noexcept;
+    bool IsZesInitOnlyControlLibVersion(ControlLibFileVersion version) noexcept;
+
+    // True when collected versions include both pre-hotfix (< 1.2.269.269) and 1.3+ builds.
+    bool IsControlLibVersionMismatch(std::span<const ControlLibFileVersion> versions) noexcept;
+
+    // Enumerates per-GPU ControlApiPath registry entries and compares file versions.
+    // Returns true when versions are mismatched OR when the compatibility check cannot be completed.
+    // Caller must not invoke ctlInit when true.
+    bool AreIgclControlLibsMismatched() noexcept;
+}
diff --git a/IntelPresentMon/ControlLib/igcl/IgclTelemetryProvider.cpp b/IntelPresentMon/ControlLib/igcl/IgclTelemetryProvider.cpp
index 6baa2e6f..390bf899 100644
--- a/IntelPresentMon/ControlLib/igcl/IgclTelemetryProvider.cpp
+++ b/IntelPresentMon/ControlLib/igcl/IgclTelemetryProvider.cpp
@@ -2,6 +2,7 @@
 // SPDX-License-Identifier: MIT
 #include "IgclTelemetryProvider.h"
 
+#include "IgclControlLibCompatibility.h"
 #include "../TelemetryMetricDiscovery.h"
 #include "../Exceptions.h"
 #include "../../CommonUtilities/Qpc.h"
@@ -73,6 +74,10 @@ namespace pmon::tel::igcl
 
     IgclTelemetryProvider::IgclTelemetryProvider()
     {
+        if (AreIgclControlLibsMismatched()) {
+            throw Except<TelemetrySubsystemAbsent>("IGCL control library unavailable");
+        }
+
         ctl_init_args_t ctlInitArgs{
             .Size = sizeof(ctl_init_args_t),
             .AppVersion = CTL_MAKE_VERSION(CTL_IMPL_MAJOR_VERSION, CTL_IMPL_MINOR_VERSION),
diff --git a/IntelPresentMon/UnitTests/IgclControlLibCompatibilityTests.cpp b/IntelPresentMon/UnitTests/IgclControlLibCompatibilityTests.cpp
new file mode 100644
index 00000000..80de1a33
--- /dev/null
+++ b/IntelPresentMon/UnitTests/IgclControlLibCompatibilityTests.cpp
@@ -0,0 +1,45 @@
+// Copyright (C) 2026 Intel Corporation
+// SPDX-License-Identifier: MIT
+#include <CppUnitTest.h>
+#include <ControlLib/igcl/IgclControlLibCompatibility.h>
+#include <array>
+#include <span>
+
+using namespace Microsoft::VisualStudio::CppUnitTestFramework;
+
+namespace IgclControlLibCompatibilityTests
+{
+    using pmon::tel::igcl::ControlLibFileVersion;
+    using pmon::tel::igcl::IsControlLibVersionMismatch;
+    using pmon::tel::igcl::IsPreHotfixControlLibVersion;
+    using pmon::tel::igcl::IsZesInitOnlyControlLibVersion;
+
+    TEST_CLASS(ControlLibVersionPredicateTests)
+    {
+    public:
+        TEST_METHOD(PreHotfixBelowOneTwoTwoSixNine)
+        {
+            Assert::IsTrue(IsPreHotfixControlLibVersion({ 1, 2, 268, 999 }));
+            Assert::IsFalse(IsPreHotfixControlLibVersion({ 1, 2, 269, 269 }));
+            Assert::IsFalse(IsPreHotfixControlLibVersion({ 1, 2, 270, 0 }));
+        }
+
+        TEST_METHOD(ZesInitOnlyAtOneThree)
+        {
+            Assert::IsTrue(IsZesInitOnlyControlLibVersion({ 1, 3, 0, 0 }));
+            Assert::IsFalse(IsZesInitOnlyControlLibVersion({ 1, 2, 999, 999 }));
+        }
+
+        TEST_METHOD(MismatchRequiresBothBuckets)
+        {
+            const ControlLibFileVersion preHotfix{ 1, 2, 100, 0 };
+            const ControlLibFileVersion zesInit{ 1, 3, 0, 0 };
+            const ControlLibFileVersion hotfixNeutral{ 1, 2, 269, 269 };
+
+            Assert::IsTrue(IsControlLibVersionMismatch(std::array{ preHotfix, zesInit }));
+            Assert::IsFalse(IsControlLibVersionMismatch(std::array{ preHotfix, hotfixNeutral }));
+            Assert::IsFalse(IsControlLibVersionMismatch(std::array{ zesInit, hotfixNeutral }));
+            Assert::IsFalse(IsControlLibVersionMismatch(std::span<const ControlLibFileVersion>{}));
+        }
+    };
+}
diff --git a/IntelPresentMon/UnitTests/UnitTests.vcxproj b/IntelPresentMon/UnitTests/UnitTests.vcxproj
index 753e744c..d83a7920 100644
--- a/IntelPresentMon/UnitTests/UnitTests.vcxproj
+++ b/IntelPresentMon/UnitTests/UnitTests.vcxproj
@@ -108,6 +108,7 @@
     <ClCompile Include="LoggingTests.cpp" />
     <ClCompile Include="MetricCapabilitiesTests.cpp" />
     <ClCompile Include="MetricsCore.cpp" />
+    <ClCompile Include="IgclControlLibCompatibilityTests.cpp" />
     <ClCompile Include="TelemetryAvailabilityMergeTests.cpp" />
     <ClCompile Include="SwapChainTests.cpp" />
     <ClCompile Include="Style.cpp" />
diff --git a/IntelPresentMon/UnitTests/UnitTests.vcxproj.filters b/IntelPresentMon/UnitTests/UnitTests.vcxproj.filters
index 5b66b8b8..76b8fa10 100644
--- a/IntelPresentMon/UnitTests/UnitTests.vcxproj.filters
+++ b/IntelPresentMon/UnitTests/UnitTests.vcxproj.filters
@@ -7,6 +7,7 @@
     <ClCompile Include="LoggingTests.cpp" />
     <ClCompile Include="MetricCapabilitiesTests.cpp" />
     <ClCompile Include="MetricsCore.cpp" />
+    <ClCompile Include="IgclControlLibCompatibilityTests.cpp" />
     <ClCompile Include="TelemetryAvailabilityMergeTests.cpp" />
     <ClCompile Include="SwapChainTests.cpp" />
     <ClCompile Include="Timing.cpp" />