diff --git a/automotive/vehicle/2.0/types.hal b/automotive/vehicle/2.0/types.hal
index 1355d9f..bc0b4d3 100644
--- a/automotive/vehicle/2.0/types.hal
+++ b/automotive/vehicle/2.0/types.hal
@@ -2569,6 +2569,11 @@
 
     /** AP can only shutdown with postponing allowed. */
     SHUTDOWN_ONLY = 3,
+
+    /**
+     * AP may enter deep sleep, but must either sleep or shut down immediately.
+     * Postponing is not allowed. */
+    SLEEP_IMMEDIATELY = 4,
 };
 
 enum VehicleApPowerStateReport : int32_t {
@@ -3581,4 +3586,3 @@
 enum VmsPublisherInformationIntegerValuesIndex : VmsBaseMessageIntegerValuesIndex {
     PUBLISHER_ID = 1,
 };
-
diff --git a/sensors/2.0/multihal/Android.bp b/sensors/2.0/multihal/Android.bp
index 5c67676..c13eaf2 100644
--- a/sensors/2.0/multihal/Android.bp
+++ b/sensors/2.0/multihal/Android.bp
@@ -21,6 +21,7 @@
     shared_libs: [
         "android.hardware.sensors@1.0",
         "android.hardware.sensors@2.0",
+        "libbase",
         "libcutils",
         "libfmq",
         "libhidlbase",
diff --git a/sensors/2.0/multihal/HalProxy.cpp b/sensors/2.0/multihal/HalProxy.cpp
index 38a627f..b78806a 100644
--- a/sensors/2.0/multihal/HalProxy.cpp
+++ b/sensors/2.0/multihal/HalProxy.cpp
@@ -20,11 +20,13 @@
 
 #include <android/hardware/sensors/2.0/types.h>
 
+#include <android-base/file.h>
 #include "hardware_legacy/power.h"
 
 #include <dlfcn.h>
 
 #include <cinttypes>
+#include <cmath>
 #include <fstream>
 #include <functional>
 #include <thread>
@@ -67,6 +69,18 @@
     return static_cast<size_t>(sensorHandle >> kBitsAfterSubHalIndex);
 }
 
+/**
+ * Convert nanoseconds to milliseconds.
+ *
+ * @param nanos The nanoseconds input.
+ *
+ * @return The milliseconds count.
+ */
+int64_t msFromNs(int64_t nanos) {
+    constexpr int64_t nanosecondsInAMillsecond = 1000000;
+    return nanos / nanosecondsInAMillsecond;
+}
+
 HalProxy::HalProxy() {
     const char* kMultiHalConfigFile = "/vendor/etc/sensors/hals.conf";
     initializeSubHalListFromConfigFile(kMultiHalConfigFile);
@@ -254,8 +268,43 @@
     return Return<void>();
 }
 
-Return<void> HalProxy::debug(const hidl_handle& /* fd */, const hidl_vec<hidl_string>& /* args */) {
-    // TODO: output debug information
+Return<void> HalProxy::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& /*args*/) {
+    if (fd.getNativeHandle() == nullptr || fd->numFds < 1) {
+        ALOGE("%s: missing fd for writing", __FUNCTION__);
+        return Void();
+    }
+
+    android::base::borrowed_fd writeFd = dup(fd->data[0]);
+
+    std::ostringstream stream;
+    stream << "===HalProxy===" << std::endl;
+    stream << "Internal values:" << std::endl;
+    stream << "  Threads are running: " << (mThreadsRun.load() ? "true" : "false") << std::endl;
+    int64_t now = getTimeNow();
+    stream << "  Wakelock timeout start time: " << msFromNs(now - mWakelockTimeoutStartTime)
+           << " ms ago" << std::endl;
+    stream << "  Wakelock timeout reset time: " << msFromNs(now - mWakelockTimeoutResetTime)
+           << " ms ago" << std::endl;
+    // TODO(b/142969448): Add logging for history of wakelock acquisition per subhal.
+    stream << "  Wakelock ref count: " << mWakelockRefCount << std::endl;
+    stream << "  Size of pending write events queue: " << mPendingWriteEventsQueue.size()
+           << std::endl;
+    if (!mPendingWriteEventsQueue.empty()) {
+        stream << "  Size of events list on front of pending writes queue: "
+               << mPendingWriteEventsQueue.front().first.size() << std::endl;
+    }
+    stream << "  # of non-dynamic sensors across all subhals: " << mSensors.size() << std::endl;
+    stream << "  # of dynamic sensors across all subhals: " << mDynamicSensors.size() << std::endl;
+    stream << "SubHals (" << mSubHalList.size() << "):" << std::endl;
+    for (ISensorsSubHal* subHal : mSubHalList) {
+        stream << "  Name: " << subHal->getName() << std::endl;
+        stream << "  Debug dump: " << std::endl;
+        android::base::WriteStringToFd(stream.str(), writeFd);
+        subHal->debug(fd, {});
+        stream.str("");
+        stream << std::endl;
+    }
+    android::base::WriteStringToFd(stream.str(), writeFd);
     return Return<void>();
 }
 
diff --git a/sensors/2.0/multihal/include/HalProxy.h b/sensors/2.0/multihal/include/HalProxy.h
index 10fce43..b1dd737 100644
--- a/sensors/2.0/multihal/include/HalProxy.h
+++ b/sensors/2.0/multihal/include/HalProxy.h
@@ -233,7 +233,7 @@
 
     int64_t mWakelockTimeoutResetTime = getTimeNow();
 
-    const char* kWakelockName = "SensorsMultiHal";
+    const char* kWakelockName = "SensorsHAL_WAKEUP";
 
     /**
      * Initialize the list of SubHal objects in mSubHalList by reading from dynamic libraries
diff --git a/sensors/2.0/multihal/tests/Android.bp b/sensors/2.0/multihal/tests/Android.bp
index e3a4af1..50a55f9 100644
--- a/sensors/2.0/multihal/tests/Android.bp
+++ b/sensors/2.0/multihal/tests/Android.bp
@@ -82,6 +82,7 @@
     shared_libs: [
         "android.hardware.sensors@1.0",
         "android.hardware.sensors@2.0",
+        "libbase",
         "libcutils",
         "libfmq",
         "libhidlbase",