diff --git a/app/src/main/cpp/waylandcomp/CMakeLists.txt b/app/src/main/cpp/waylandcomp/CMakeLists.txt
index 33585818b..f8eb31291 100644
--- a/app/src/main/cpp/waylandcomp/CMakeLists.txt
+++ b/app/src/main/cpp/waylandcomp/CMakeLists.txt
@@ -8,6 +8,7 @@ add_library(droiddeckwayland SHARED
         src/sc_layer.c
         src/ahb_swapchain.c
         src/waylandcomp_jni.c
+        src/gpu_clock_pin.c
         src/droiddeck_ext.c
         src/wl_dmabuf.c
         src/wl_clipboard.c
diff --git a/app/src/main/cpp/waylandcomp/src/gpu_clock_pin.c b/app/src/main/cpp/waylandcomp/src/gpu_clock_pin.c
new file mode 100644
index 000000000..5b079da97
--- /dev/null
+++ b/app/src/main/cpp/waylandcomp/src/gpu_clock_pin.c
@@ -0,0 +1,160 @@
+#include "gpu_clock_pin.h"
+
+#include <android/log.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <stdatomic.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "../../adrenotools/src/hook/kgsl.h"
+
+static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+static pthread_t worker;
+static bool joinable;
+static atomic_bool running;
+
+struct pin {
+    int fd;
+    unsigned int context;
+    unsigned int memory;
+    unsigned int timestamp;
+    unsigned long gpuaddr;
+    void *commands;
+    size_t size;
+};
+
+static struct pin pin = { .fd = -1 };
+
+static void release_pin(void) {
+    if (pin.context) {
+        struct kgsl_drawctxt_destroy destroy = { .drawctxt_id = pin.context };
+        ioctl(pin.fd, IOCTL_KGSL_DRAWCTXT_DESTROY, &destroy);
+    }
+    if (pin.commands) munmap(pin.commands, pin.size);
+    if (pin.memory) {
+        struct kgsl_gpumem_free_id free_memory = { .id = pin.memory };
+        ioctl(pin.fd, IOCTL_KGSL_GPUMEM_FREE_ID, &free_memory);
+    }
+    if (pin.fd >= 0) close(pin.fd);
+    pin = (struct pin) { .fd = -1 };
+}
+
+static bool submit_pin(void) {
+    struct kgsl_command_object object = {
+        .gpuaddr = pin.gpuaddr,
+        .size = 2 * sizeof(uint32_t),
+        .flags = KGSL_CMDLIST_IB,
+        .id = pin.memory,
+    };
+    struct kgsl_gpu_command command = {
+        .flags = KGSL_CMDBATCH_PWR_CONSTRAINT,
+        .cmdlist = (uintptr_t)&object,
+        .cmdsize = sizeof(object),
+        .numcmds = 1,
+        .context_id = pin.context,
+    };
+    if (ioctl(pin.fd, IOCTL_KGSL_GPU_COMMAND, &command) < 0) return false;
+    pin.timestamp = command.timestamp;
+    return true;
+}
+
+static bool prepare_pin(void) {
+    pin.fd = open("/dev/kgsl-3d0", O_RDWR | O_CLOEXEC);
+    if (pin.fd < 0) return false;
+    struct kgsl_drawctxt_create context = {
+        .flags = KGSL_CONTEXT_NO_GMEM_ALLOC | KGSL_CONTEXT_PREAMBLE | KGSL_CONTEXT_PWR_CONSTRAINT,
+    };
+    if (ioctl(pin.fd, IOCTL_KGSL_DRAWCTXT_CREATE, &context) < 0) return false;
+    pin.context = context.drawctxt_id;
+    struct kgsl_device_constraint_pwrlevel level = { .level = KGSL_CONSTRAINT_PWR_MAX };
+    struct kgsl_device_constraint constraint = {
+        .type = KGSL_CONSTRAINT_PWRLEVEL,
+        .context_id = pin.context,
+        .data = &level,
+        .size = sizeof(level),
+    };
+    struct kgsl_device_getproperty property = {
+        .type = KGSL_PROP_PWR_CONSTRAINT,
+        .value = &constraint,
+        .sizebytes = sizeof(constraint),
+    };
+    if (ioctl(pin.fd, IOCTL_KGSL_SETPROPERTY, &property) < 0) return false;
+    struct kgsl_gpumem_alloc_id memory = { .size = 4096 };
+    if (ioctl(pin.fd, IOCTL_KGSL_GPUMEM_ALLOC_ID, &memory) < 0) return false;
+    pin.memory = memory.id;
+    pin.gpuaddr = memory.gpuaddr;
+    pin.size = memory.mmapsize;
+    void *commands = mmap(NULL, pin.size, PROT_READ | PROT_WRITE, MAP_SHARED, pin.fd,
+                          (off_t)pin.memory << 12);
+    if (commands == MAP_FAILED) return false;
+    pin.commands = commands;
+    // Type-7 CP_NOP, one payload dword; both odd-parity bits are zero.
+    uint32_t *words = commands;
+    words[0] = 0x70100001;
+    words[1] = 0;
+    struct kgsl_gpumem_sync_cache sync = { .id = pin.memory, .op = KGSL_GPUMEM_CACHE_CLEAN };
+    if (ioctl(pin.fd, IOCTL_KGSL_GPUMEM_SYNC_CACHE, &sync) < 0) return false;
+    return submit_pin();
+}
+
+static void *hold_pin(void *unused) {
+    (void)unused;
+    while (atomic_load(&running)) {
+        struct kgsl_device_waittimestamp_ctxtid wait = {
+            .context_id = pin.context,
+            .timestamp = pin.timestamp,
+            .timeout = 100,
+        };
+        if (ioctl(pin.fd, IOCTL_KGSL_DEVICE_WAITTIMESTAMP_CTXTID, &wait) < 0) {
+            if (errno == EINTR || errno == ETIMEDOUT) continue;
+            break;
+        }
+        // Constraints expire after idle_timer (normally 80 ms); renew with a NOP, keeping devfreq alive.
+        usleep(25000);
+        if (atomic_load(&running) && !submit_pin()) break;
+    }
+    if (atomic_exchange(&running, false))
+        __android_log_print(ANDROID_LOG_WARN, "GpuClockPin", "constraint stopped: %s", strerror(errno));
+    release_pin();
+    return NULL;
+}
+
+bool gpu_clock_pin_set(bool on) {
+    pthread_mutex_lock(&lock);
+    if (joinable) {
+        if (on && atomic_load(&running)) {
+            pthread_mutex_unlock(&lock);
+            return true;
+        }
+        atomic_store(&running, false);
+        pthread_join(worker, NULL);
+        joinable = false;
+    }
+    bool ok = true;
+    if (on) {
+        ok = prepare_pin();
+        if (ok) {
+            atomic_store(&running, true);
+            int error = pthread_create(&worker, NULL, hold_pin, NULL);
+            if (error) {
+                atomic_store(&running, false);
+                errno = error;
+                ok = false;
+            } else {
+                joinable = true;
+            }
+        }
+        if (!ok) {
+            int error = errno;
+            release_pin();
+            errno = error;
+        }
+    }
+    pthread_mutex_unlock(&lock);
+    return ok;
+}
diff --git a/app/src/main/cpp/waylandcomp/src/gpu_clock_pin.h b/app/src/main/cpp/waylandcomp/src/gpu_clock_pin.h
new file mode 100644
index 000000000..5fe17d102
--- /dev/null
+++ b/app/src/main/cpp/waylandcomp/src/gpu_clock_pin.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#include <stdbool.h>
+
+bool gpu_clock_pin_set(bool on);
diff --git a/app/src/main/cpp/waylandcomp/src/waylandcomp_jni.c b/app/src/main/cpp/waylandcomp/src/waylandcomp_jni.c
index 6a407088b..bc349cdf6 100644
--- a/app/src/main/cpp/waylandcomp/src/waylandcomp_jni.c
+++ b/app/src/main/cpp/waylandcomp/src/waylandcomp_jni.c
@@ -16,6 +16,7 @@
 #include "effects_chain.h"
 #include "cardboard.h"
 #include "droiddeck_color.h"
+#include "gpu_clock_pin.h"
 
 extern int droiddeck_wayland_run(void);
 extern void droiddeck_wayland_set_scale_mode(int mode, int alignment);
@@ -634,8 +635,14 @@ Java_com_droiddeck_launcher_wayland_WaylandCompositor_nativeTextInputDelete(JNIE
 extern void adrenotools_set_turbo(bool turbo);
 JNIEXPORT void JNICALL
 Java_com_droiddeck_launcher_wayland_WaylandCompositor_nativeSetGpuTurbo(JNIEnv *env, jclass clazz, jboolean on) {
-    (void)env; (void)clazz;
-    adrenotools_set_turbo(on == JNI_TRUE);
+    (void)clazz;
+    if (!gpu_clock_pin_set(on == JNI_TRUE)) {
+        int saved_errno = errno;
+        jclass error = (*env)->FindClass(env, "java/lang/IllegalStateException");
+        if (error) (*env)->ThrowNew(env, error, strerror(saved_errno));
+    }
+    // Clear a legacy global pin when recovering its marker after an app upgrade or crash.
+    if (on != JNI_TRUE) adrenotools_set_turbo(false);
 }
 
 JNIEXPORT jint JNICALL
diff --git a/app/src/main/java/com/droiddeck/launcher/session/GpuClockPin.kt b/app/src/main/java/com/droiddeck/launcher/session/GpuClockPin.kt
index 7855c4959..40135f08d 100644
--- a/app/src/main/java/com/droiddeck/launcher/session/GpuClockPin.kt
+++ b/app/src/main/java/com/droiddeck/launcher/session/GpuClockPin.kt
@@ -26,6 +26,7 @@ object GpuClockPin {
             pinned = true
             "gpu clock: held at its top"
         } catch (t: Throwable) {
+            File(context.filesDir, MARKER).delete()
             Log.w(TAG, "pin", t)
             "gpu clock: pin failed"
         }
diff --git a/tools/tests/test_gpu_clock_pin.c b/tools/tests/test_gpu_clock_pin.c
new file mode 100644
index 000000000..8e3f0b6a4
--- /dev/null
+++ b/tools/tests/test_gpu_clock_pin.c
@@ -0,0 +1,172 @@
+#include <assert.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdarg.h>
+#include <stdatomic.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "../../app/src/main/cpp/adrenotools/src/hook/kgsl.h"
+#include "../../app/src/main/cpp/waylandcomp/src/gpu_clock_pin.h"
+
+enum { NONE, OPEN, CONTEXT, CONSTRAINT, MEMORY, MAP, SYNC, SUBMIT, THREAD, WAIT };
+static atomic_int failure, descriptors, contexts, memories, mappings, submissions;
+static atomic_bool timeout_wait;
+static uint32_t commands[1024];
+
+int __android_log_print(int priority, const char *tag, const char *format, ...) {
+    (void)priority; (void)tag; (void)format;
+    return 0;
+}
+
+int __wrap_open(const char *path, int flags, ...) {
+    (void)flags;
+    assert(!strcmp(path, "/dev/kgsl-3d0"));
+    if (atomic_load(&failure) == OPEN) { errno = EACCES; return -1; }
+    assert(atomic_fetch_add(&descriptors, 1) == 0);
+    return 91;
+}
+
+int __wrap_close(int fd) {
+    assert(fd == 91);
+    assert(atomic_fetch_sub(&descriptors, 1) == 1);
+    errno = EBADF;
+    return 0;
+}
+
+void *__wrap_mmap(void *address, size_t size, int protection, int flags, int fd, off_t offset) {
+    (void)address; (void)protection; (void)flags;
+    assert(fd == 91 && size == sizeof(commands) && offset == (23 << 12));
+    if (atomic_load(&failure) == MAP) { errno = EACCES; return MAP_FAILED; }
+    assert(atomic_fetch_add(&mappings, 1) == 0);
+    return commands;
+}
+
+int __wrap_munmap(void *address, size_t size) {
+    assert(address == commands && size == sizeof(commands));
+    assert(atomic_fetch_sub(&mappings, 1) == 1);
+    return 0;
+}
+
+#ifdef __ANDROID__
+int __wrap_ioctl(int fd, int request, ...) {
+#else
+int __wrap_ioctl(int fd, unsigned long request, ...) {
+#endif
+    assert(fd == 91);
+    va_list args;
+    va_start(args, request);
+    void *arg = va_arg(args, void *);
+    va_end(args);
+    int step = NONE;
+    switch ((unsigned int)request) {
+    case IOCTL_KGSL_DRAWCTXT_CREATE: step = CONTEXT; break;
+    case IOCTL_KGSL_SETPROPERTY: step = CONSTRAINT; break;
+    case IOCTL_KGSL_GPUMEM_ALLOC_ID: step = MEMORY; break;
+    case IOCTL_KGSL_GPUMEM_SYNC_CACHE: step = SYNC; break;
+    case IOCTL_KGSL_GPU_COMMAND: step = SUBMIT; break;
+    case IOCTL_KGSL_DEVICE_WAITTIMESTAMP_CTXTID: step = WAIT; break;
+    }
+    if (step && atomic_load(&failure) == step) { errno = EACCES; return -1; }
+    switch ((unsigned int)request) {
+    case IOCTL_KGSL_DRAWCTXT_CREATE: {
+        struct kgsl_drawctxt_create *context = arg;
+        assert(context->flags & KGSL_CONTEXT_PWR_CONSTRAINT);
+        context->drawctxt_id = 17;
+        atomic_fetch_add(&contexts, 1);
+        break;
+    }
+    case IOCTL_KGSL_SETPROPERTY: {
+        struct kgsl_device_getproperty *property = arg;
+        assert(property->type == KGSL_PROP_PWR_CONSTRAINT);
+        struct kgsl_device_constraint *constraint = property->value;
+        assert(constraint->context_id == 17 && constraint->type == KGSL_CONSTRAINT_PWRLEVEL);
+        assert(((struct kgsl_device_constraint_pwrlevel *)constraint->data)->level == KGSL_CONSTRAINT_PWR_MAX);
+        break;
+    }
+    case IOCTL_KGSL_GPUMEM_ALLOC_ID: {
+        struct kgsl_gpumem_alloc_id *memory = arg;
+        memory->id = 23; memory->gpuaddr = 0x100000; memory->mmapsize = sizeof(commands);
+        atomic_fetch_add(&memories, 1);
+        break;
+    }
+    case IOCTL_KGSL_GPUMEM_SYNC_CACHE:
+        assert(((struct kgsl_gpumem_sync_cache *)arg)->op == KGSL_GPUMEM_CACHE_CLEAN);
+        break;
+    case IOCTL_KGSL_GPU_COMMAND: {
+        struct kgsl_gpu_command *command = arg;
+        struct kgsl_command_object *object = (void *)(uintptr_t)command->cmdlist;
+        assert(command->context_id == 17 && command->numcmds == 1);
+        assert(command->flags & KGSL_CMDBATCH_PWR_CONSTRAINT);
+        assert(object->id == 23 && object->gpuaddr == 0x100000 && object->size == 8);
+        assert(commands[0] == 0x70100001 && commands[1] == 0);
+        command->timestamp = atomic_fetch_add(&submissions, 1) + 1;
+        break;
+    }
+    case IOCTL_KGSL_DEVICE_WAITTIMESTAMP_CTXTID:
+        if (atomic_load(&timeout_wait)) { errno = ETIMEDOUT; return -1; }
+        break;
+    case IOCTL_KGSL_DRAWCTXT_DESTROY:
+        assert(atomic_fetch_sub(&contexts, 1) == 1);
+        break;
+    case IOCTL_KGSL_GPUMEM_FREE_ID:
+        assert(atomic_fetch_sub(&memories, 1) == 1);
+        break;
+    default: assert(!"unexpected ioctl");
+    }
+    return 0;
+}
+
+int __real_pthread_create(pthread_t *, const pthread_attr_t *, void *(*)(void *), void *);
+int __wrap_pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start)(void *), void *arg) {
+    if (atomic_load(&failure) == THREAD) return EAGAIN;
+    return __real_pthread_create(thread, attr, start, arg);
+}
+
+static void assert_released(void) {
+    assert(!atomic_load(&descriptors) && !atomic_load(&contexts));
+    assert(!atomic_load(&memories) && !atomic_load(&mappings));
+}
+
+int main(void) {
+    assert(gpu_clock_pin_set(false));
+    assert_released();
+    for (int step = OPEN; step <= THREAD; ++step) {
+        atomic_store(&failure, step);
+        assert(!gpu_clock_pin_set(true));
+        assert(errno == (step == THREAD ? EAGAIN : EACCES));
+        assert_released();
+    }
+    atomic_store(&failure, NONE);
+    atomic_store(&submissions, 0);
+    assert(gpu_clock_pin_set(true));
+    assert(gpu_clock_pin_set(true));
+    usleep(80000);
+    assert(atomic_load(&submissions) > 1);
+    assert(gpu_clock_pin_set(false));
+    assert(gpu_clock_pin_set(false));
+    assert_released();
+
+    atomic_store(&timeout_wait, true);
+    atomic_store(&submissions, 0);
+    assert(gpu_clock_pin_set(true));
+    usleep(80000);
+    assert(atomic_load(&submissions) == 1);
+    assert(gpu_clock_pin_set(false));
+    assert_released();
+    atomic_store(&timeout_wait, false);
+
+    atomic_store(&failure, WAIT);
+    assert(gpu_clock_pin_set(true));
+    for (int i = 0; i < 100 && atomic_load(&descriptors); ++i) usleep(10000);
+    assert_released();
+    atomic_store(&failure, NONE);
+    assert(gpu_clock_pin_set(true));
+    assert(gpu_clock_pin_set(false));
+    assert_released();
+    puts("gpu clock pin: failure cleanup, renewal, bounded queue and restart passed");
+    return 0;
+}
diff --git a/tools/tests/test_gpu_clock_pin.py b/tools/tests/test_gpu_clock_pin.py
new file mode 100644
index 000000000..f6f466871
--- /dev/null
+++ b/tools/tests/test_gpu_clock_pin.py
@@ -0,0 +1,30 @@
+import pathlib
+import shutil
+import subprocess
+import sys
+import tempfile
+import unittest
+
+
+ROOT = pathlib.Path(__file__).resolve().parents[2]
+
+
+class GpuClockPinTest(unittest.TestCase):
+    @unittest.skipUnless(sys.platform.startswith('linux') and shutil.which('cc'), 'requires a Linux C compiler')
+    def test_constraint_lifecycle(self):
+        with tempfile.TemporaryDirectory() as tmp:
+            directory = pathlib.Path(tmp)
+            (directory / 'android').mkdir()
+            (directory / 'android/log.h').write_text(
+                '#define ANDROID_LOG_WARN 5\n'
+                'int __android_log_print(int, const char *, const char *, ...);\n')
+            binary = directory / 'gpu-clock-pin-test'
+            subprocess.run([
+                'cc', '-std=c11', '-D_DEFAULT_SOURCE', '-D__user=', '-Wall', '-Wextra', '-Werror',
+                '-I', str(directory), '-pthread',
+                str(ROOT / 'tools/tests/test_gpu_clock_pin.c'),
+                str(ROOT / 'app/src/main/cpp/waylandcomp/src/gpu_clock_pin.c'),
+                '-Wl,--wrap=open,--wrap=close,--wrap=mmap,--wrap=munmap,--wrap=ioctl,--wrap=pthread_create',
+                '-o', str(binary),
+            ], check=True)
+            subprocess.run([str(binary)], check=True, timeout=10)