diff --git a/readme.md b/readme.md
index 010496c7..54df436d 100644
--- a/readme.md
+++ b/readme.md
@@ -38,6 +38,7 @@ Handheld Daemon features great support for Lenovo, Asus, GPD, OneXPlayer, and Ay
   - Win Max 2
   - Win Max 5
 - OneXPlayer
+  - 3 (Intel, TDP)
   - G1 (AMD, Intel w/o TDP)
   - X1, X1Pro (AMD, Intel w/o TDP), X1z, X1Pro EVA-01, X1 Air (Intel-no TDP)
   - X1 Mini, X1 Mini Pro
diff --git a/src/adjustor/drivers/intel_rapl/__init__.py b/src/adjustor/drivers/intel_rapl/__init__.py
new file mode 100644
index 00000000..b7641428
--- /dev/null
+++ b/src/adjustor/drivers/intel_rapl/__init__.py
@@ -0,0 +1,318 @@
+import logging
+import os
+import shutil
+import subprocess
+import time
+from typing import Sequence
+
+from hhd.plugins import Config, Context, Event, HHDPlugin, load_relative_yaml
+
+logger = logging.getLogger(__name__)
+
+MSR_RAPL_POWER_UNIT = 0x606
+MSR_PKG_POWER_LIMIT = 0x610
+
+PL1_POWER_MASK = 0x7FFF
+PKG_POWER_LIMIT_LOCK = 1 << 63
+
+MSR_DEVICE = "/dev/cpu/0/msr"
+DMI_PRODUCT = "/sys/devices/virtual/dmi/id/product_name"
+CPUINFO = "/proc/cpuinfo"
+
+EXPECTED_PRODUCT = "ONEXPLAYER 3"
+MIN_TDP = 8
+DEFAULT_TDP = 25
+MAX_TDP = 35
+
+APPLY_DELAY = 0.7
+SLEEP_DELAY = 4.0
+
+
+def get_power_exponent(rapl_units: int) -> int:
+    """Return the Intel RAPL power-unit exponent from MSR 0x606."""
+    exponent = rapl_units & 0xF
+    if exponent > 8:
+        raise ValueError(f"Unexpected RAPL power-unit exponent: {exponent}")
+    return exponent
+
+
+def watts_to_raw(watts: int, exponent: int) -> int:
+    """Encode an integer watt value for the 15-bit PL1 power field."""
+    raw = int(watts) * (1 << exponent)
+    if raw < 0 or raw > PL1_POWER_MASK:
+        raise ValueError(f"PL1 raw value 0x{raw:x} does not fit in 15 bits")
+    return raw
+
+
+def replace_pl1_power(msr_value: int, raw_pl1: int) -> int:
+    """Replace only MSR_PKG_POWER_LIMIT bits 14:0."""
+    if raw_pl1 < 0 or raw_pl1 > PL1_POWER_MASK:
+        raise ValueError(f"PL1 raw value 0x{raw_pl1:x} does not fit in 15 bits")
+    return (msr_value & ~PL1_POWER_MASK) | raw_pl1
+
+
+class IntelRaplDriverPlugin(HHDPlugin):
+    """Intel RAPL PL1 backend for the Intel ONEXPLAYER 3."""
+
+    def __init__(self) -> None:
+        self.name = "adjustor_intel_rapl"
+        self.priority = 6
+        self.log = "irap"
+
+        self.available = False
+        self.last_tdp: int | None = None
+        self.pending_tdp: int | None = None
+        self.reapply_at: float | None = None
+
+    @staticmethod
+    def _read_text(path: str) -> str:
+        with open(path) as f:
+            return f.read().strip()
+
+    @staticmethod
+    def _ensure_msr_device() -> bool:
+        if os.path.exists(MSR_DEVICE):
+            return True
+
+        modprobe = shutil.which("modprobe") or "/usr/bin/modprobe"
+        try:
+            subprocess.run(
+                [modprobe, "msr"],
+                check=True,
+                stdout=subprocess.DEVNULL,
+                stderr=subprocess.PIPE,
+                text=True,
+            )
+        except Exception as exc:
+            logger.error("Failed loading Intel 'msr' module: %s", exc)
+            return False
+
+        return os.path.exists(MSR_DEVICE)
+
+    @staticmethod
+    def _read_msr(register: int) -> int:
+        fd = os.open(MSR_DEVICE, os.O_RDONLY)
+        try:
+            value = os.pread(fd, 8, register)
+        finally:
+            os.close(fd)
+
+        if len(value) != 8:
+            raise OSError(
+                f"Short MSR read at 0x{register:x}: "
+                f"expected 8 bytes, got {len(value)}"
+            )
+
+        return int.from_bytes(value, "little", signed=False)
+
+    @staticmethod
+    def _write_msr(register: int, value: int) -> None:
+        fd = os.open(MSR_DEVICE, os.O_WRONLY)
+        try:
+            written = os.pwrite(fd, value.to_bytes(8, "little"), register)
+        finally:
+            os.close(fd)
+
+        if written != 8:
+            raise OSError(
+                f"Short MSR write at 0x{register:x}: "
+                f"expected 8 bytes, wrote {written}"
+            )
+
+    @classmethod
+    def _restore_pl1(cls, previous_raw: int) -> None:
+        current = cls._read_msr(MSR_PKG_POWER_LIMIT)
+
+        if current & PKG_POWER_LIMIT_LOCK:
+            logger.error("MSR_PKG_POWER_LIMIT locked before PL1 rollback.")
+            return
+
+        cls._write_msr(
+            MSR_PKG_POWER_LIMIT,
+            replace_pl1_power(current, previous_raw),
+        )
+
+    def _probe(self) -> tuple[int, int] | None:
+        try:
+            if self._read_text(DMI_PRODUCT) != EXPECTED_PRODUCT:
+                return None
+
+            if "GenuineIntel" not in self._read_text(CPUINFO):
+                return None
+
+            if not self._ensure_msr_device():
+                return None
+
+            exponent = get_power_exponent(self._read_msr(MSR_RAPL_POWER_UNIT))
+            package_limit = self._read_msr(MSR_PKG_POWER_LIMIT)
+
+            if package_limit & PKG_POWER_LIMIT_LOCK:
+                logger.error(
+                    "MSR_PKG_POWER_LIMIT is locked; TDP control unavailable."
+                )
+                return None
+
+            return exponent, package_limit
+        except Exception as exc:
+            logger.error("Intel RAPL probe failed: %s", exc)
+            return None
+
+    def is_supported(self) -> bool:
+        return self._probe() is not None
+
+    def open(self, emit, context: Context):
+        probed = self._probe()
+        if not probed:
+            self.available = False
+            return
+
+        exponent, package_limit = probed
+        pl1_raw = package_limit & PL1_POWER_MASK
+        pl1 = pl1_raw / float(1 << exponent)
+
+        logger.info(
+            "ONEXPLAYER 3 Intel RAPL backend ready: "
+            "unit=1/%d W, PL1=%.3f W, range=%d-%d W",
+            1 << exponent,
+            pl1,
+            MIN_TDP,
+            MAX_TDP,
+        )
+        self.available = True
+
+    def settings(self):
+        return {"tdp": {"intel_rapl": load_relative_yaml("settings.yml")}}
+
+    def _set_tdp(self, watts: int) -> bool:
+        if not self.available:
+            return False
+
+        watts = int(watts)
+        if watts < MIN_TDP or watts > MAX_TDP:
+            logger.warning(
+                "Rejecting ONEXPLAYER 3 PL1=%d W outside %d-%d W.",
+                watts,
+                MIN_TDP,
+                MAX_TDP,
+            )
+            return False
+
+        previous_raw: int | None = None
+
+        try:
+            exponent = get_power_exponent(self._read_msr(MSR_RAPL_POWER_UNIT))
+            requested_raw = watts_to_raw(watts, exponent)
+
+            old = self._read_msr(MSR_PKG_POWER_LIMIT)
+
+            if old & PKG_POWER_LIMIT_LOCK:
+                logger.error(
+                    "MSR_PKG_POWER_LIMIT became locked; refusing PL1 write."
+                )
+                self.available = False
+                return False
+
+            previous_raw = old & PL1_POWER_MASK
+
+            if previous_raw == requested_raw:
+                self.last_tdp = watts
+                return True
+
+            new = replace_pl1_power(old, requested_raw)
+            self._write_msr(MSR_PKG_POWER_LIMIT, new)
+
+            verify = self._read_msr(MSR_PKG_POWER_LIMIT)
+            verify_raw = verify & PL1_POWER_MASK
+
+            if verify_raw != requested_raw:
+                logger.error(
+                    "PL1 verification failed: requested=0x%x, read=0x%x. "
+                    "Restoring previous PL1.",
+                    requested_raw,
+                    verify_raw,
+                )
+                self._restore_pl1(previous_raw)
+                return False
+
+            self.last_tdp = watts
+            logger.info(
+                "ONEXPLAYER 3 PL1 set to %d W: "
+                "MSR 0x610 0x%016x -> 0x%016x",
+                watts,
+                old,
+                verify,
+            )
+            return True
+
+        except Exception:
+            logger.exception("Failed setting ONEXPLAYER 3 Intel RAPL PL1.")
+
+            if previous_raw is not None:
+                try:
+                    self._restore_pl1(previous_raw)
+                except Exception:
+                    logger.exception("Failed restoring previous PL1.")
+
+            return False
+
+    def update(self, conf: Config):
+        if not conf["hhd.settings.tdp_ready"].to(bool) or not self.available:
+            return
+
+        if self.pending_tdp is not None:
+            target = self.pending_tdp
+            self.pending_tdp = None
+            conf["tdp.intel_rapl.tdp"] = target
+        else:
+            target = conf["tdp.intel_rapl.tdp"].to(int)
+
+        target = max(MIN_TDP, min(MAX_TDP, target))
+
+        if target != conf["tdp.intel_rapl.tdp"].to(int):
+            conf["tdp.intel_rapl.tdp"] = target
+
+        now = time.perf_counter()
+        timed_reapply = self.reapply_at is not None and now >= self.reapply_at
+
+        if timed_reapply:
+            self.reapply_at = None
+
+        if self.last_tdp != target or timed_reapply:
+            self._set_tdp(target)
+
+    def notify(self, events: Sequence[Event]):
+        for event in events:
+            if event["type"] == "tdp":
+                requested = event.get("tdp")
+                if requested is None:
+                    continue
+
+                requested = int(requested)
+                if MIN_TDP <= requested <= MAX_TDP:
+                    self.pending_tdp = requested
+                else:
+                    logger.warning(
+                        "Ignoring external TDP event %d W outside %d-%d W.",
+                        requested,
+                        MIN_TDP,
+                        MAX_TDP,
+                    )
+
+            elif event["type"] == "special" and event.get("event") == "wakeup":
+                logger.info(
+                    "Waking from sleep; reapplying ONEXPLAYER 3 PL1 "
+                    "after %.1f seconds.",
+                    SLEEP_DELAY,
+                )
+                self.reapply_at = time.perf_counter() + SLEEP_DELAY
+
+            elif (
+                event["type"] == "acpi"
+                and event.get("event") in ("ac", "dc")
+                and self.reapply_at is None
+            ):
+                logger.info(
+                    "Power adapter status switched to '%s'; reapplying PL1.",
+                    event["event"],
+                )
+                self.reapply_at = time.perf_counter() + APPLY_DELAY
diff --git a/src/adjustor/drivers/intel_rapl/settings.yml b/src/adjustor/drivers/intel_rapl/settings.yml
new file mode 100644
index 00000000..a84d1b31
--- /dev/null
+++ b/src/adjustor/drivers/intel_rapl/settings.yml
@@ -0,0 +1,15 @@
+title: ONEXPLAYER 3 TDP
+type: container
+tags: [hide-title]
+children:
+  tdp:
+    type: int
+    title: TDP
+    hint: >-
+      Intel package long-term power limit (PL1). Only the PL1 power field
+      in MSR 0x610 is modified; PL2 and all other fields are preserved.
+    min: 8
+    max: 35
+    step: 1
+    default: 25
+    unit: W
diff --git a/src/adjustor/hhd.py b/src/adjustor/hhd.py
index 4d0484c8..77aee8dc 100644
--- a/src/adjustor/hhd.py
+++ b/src/adjustor/hhd.py
@@ -214,6 +214,7 @@ def autodetect(existing: Sequence[HHDPlugin]) -> Sequence[HHDPlugin]:
     from .drivers.asus import AsusDriverPlugin
     from .drivers.lenovo import LenovoDriverPlugin
     from .drivers.msi import MsiDriverPlugin
+    from .drivers.intel_rapl import IntelRaplDriverPlugin
     from .drivers.smu import SmuDriverPlugin, SmuQamPlugin
     from .drivers.gpu import GpuPlugin
     from .drivers.battery import BatteryPlugin
@@ -253,6 +254,23 @@ def autodetect(existing: Sequence[HHDPlugin]) -> Sequence[HHDPlugin]:
             max_tdp = v["max_tdp"]
             break
 
+    # ONEXPLAYER3_INTEL_RAPL
+    if (
+        not drivers_matched
+        and prod == "ONEXPLAYER 3"
+        and "GenuineIntel" in cpuinfo
+    ):
+        from .drivers.general import GeneralPowerPlugin
+
+        driver = IntelRaplDriverPlugin()
+        if driver.is_supported():
+            logger.info("Using ONEXPLAYER 3 Intel RAPL PL1 TDP backend.")
+            drivers.extend([driver, GeneralPowerPlugin()])
+            drivers_matched = True
+            min_tdp = 8
+            default_tdp = 25
+            max_tdp = 35
+
     if not drivers_matched and USE_UNIFIED:
         driver = UnifiedDriverPlugin()
         if driver.is_supported():
diff --git a/tests/test_intel_rapl.py b/tests/test_intel_rapl.py
new file mode 100644
index 00000000..1bdd76c2
--- /dev/null
+++ b/tests/test_intel_rapl.py
@@ -0,0 +1,72 @@
+import unittest
+from unittest.mock import MagicMock, mock_open, patch
+
+from adjustor.drivers.intel_rapl import (
+    PL1_POWER_MASK,
+    get_power_exponent,
+    replace_pl1_power,
+    watts_to_raw,
+)
+from adjustor.hhd import AdjustorInitPlugin, autodetect
+
+
+class IntelRaplHelpersTest(unittest.TestCase):
+    def test_onexplayer3_known_values(self):
+        self.assertEqual(get_power_exponent(0xA0E03), 3)
+        self.assertEqual(watts_to_raw(25, 3), 0x0C8)
+        self.assertEqual(watts_to_raw(30, 3), 0x0F0)
+        self.assertEqual(watts_to_raw(35, 3), 0x118)
+
+    def test_replace_pl1_preserves_every_other_bit(self):
+        old = 0x000081A000DD80C8
+        new = replace_pl1_power(old, 0x118)
+
+        self.assertEqual(new, 0x000081A000DD8118)
+        self.assertEqual(new & PL1_POWER_MASK, 0x118)
+        self.assertEqual(new & ~PL1_POWER_MASK, old & ~PL1_POWER_MASK)
+
+
+class IntelRaplAutodetectTest(unittest.TestCase):
+    def test_onexplayer3_rapl_precedes_unified(self):
+        rapl = MagicMock(name="intel_rapl")
+        rapl.is_supported.return_value = True
+        general = MagicMock(name="general")
+
+        file_data = [
+            "ONEXPLAYER 3",
+            "ONEXPLAYER 3",
+            "vendor_id : GenuineIntel\nmodel name : Intel Panther Lake",
+        ]
+
+        def fake_open(*args, **kwargs):
+            if not file_data:
+                raise AssertionError(f"Unexpected open: {args[0]}")
+            return mock_open(read_data=file_data.pop(0))()
+
+        with (
+            patch("builtins.open", side_effect=fake_open),
+            patch("adjustor.hhd.USE_UNIFIED", True),
+            patch("adjustor.hhd.ASUS_DATA", {}),
+            patch("adjustor.hhd.MSI_DATA", {}),
+            patch(
+                "adjustor.drivers.intel_rapl.IntelRaplDriverPlugin",
+                return_value=rapl,
+            ),
+            patch(
+                "adjustor.drivers.general.GeneralPowerPlugin",
+                return_value=general,
+            ),
+            patch("adjustor.drivers.unified.UnifiedDriverPlugin") as unified,
+        ):
+            plugins = autodetect([])
+
+        self.assertIs(plugins[0], rapl)
+        self.assertIs(plugins[1], general)
+        self.assertTrue(
+            any(isinstance(plugin, AdjustorInitPlugin) for plugin in plugins)
+        )
+        unified.assert_not_called()
+
+
+if __name__ == "__main__":
+    unittest.main()