diff --git a/core/libs/prx/libScePad/Export.cpp b/core/libs/prx/libScePad/Export.cpp
index 943ebe6b9..10f597db2 100644
--- a/core/libs/prx/libScePad/Export.cpp
+++ b/core/libs/prx/libScePad/Export.cpp
@@ -237,7 +237,7 @@ int APS5_VABI scePadSetVibration(int handle, const PadVibrationParam* param) {
 
 int APS5_VABI scePadSetVibrationMode(int handle, int mode) {
  if (handle != PAD_HANDLE) return PAD_ERROR_INVALID_HANDLE;
- if (mode < 0 || mode > 2) return PAD_ERROR_INVALID_ARG;
+ if (mode < 0 || mode > 3) return PAD_ERROR_INVALID_ARG;
  Pad::SetVibrationMode(mode);
  return PAD_OK;
 }
diff --git a/core/libs/tests/GuestPad.cpp b/core/libs/tests/GuestPad.cpp
index 454d8de60..5a7f7fab9 100644
--- a/core/libs/tests/GuestPad.cpp
+++ b/core/libs/tests/GuestPad.cpp
@@ -199,7 +199,8 @@ int main() {
     CheckInjectedState(path);
     Require(scePadSetVibrationMode(handle, 1) == 0);
     Require(scePadSetVibrationMode(handle, 2) == 0);
-    Require(scePadSetVibrationMode(handle, 3) == PAD_ERROR_INVALID_ARG);
+    Require(scePadSetVibrationMode(handle, 3) == 0);
+    Require(scePadSetVibrationMode(handle, 4) == PAD_ERROR_INVALID_ARG);
     Require(scePadSetVibrationMode(handle, -1) == PAD_ERROR_INVALID_ARG);
     Require(scePadGetHandle(0xff, 16, 0) == handle);
     Require(scePadGetHandle(user, 16, 0) == noHandle);
diff --git a/docs/dev/TechnicalDebt.md b/docs/dev/TechnicalDebt.md
index cb265cfa1..a907d34b4 100644
--- a/docs/dev/TechnicalDebt.md
+++ b/docs/dev/TechnicalDebt.md
@@ -91,6 +91,7 @@ Throughout the project, every function at every stage either **does exactly what
 - [sceAgcDcbSetCfRegisterDirect, sceAgcDcbSetCfRegisterRangeDirect](../../core/libs/prx/libSceAgc/DcbState/src/Registers.cpp) (libSceAgc) - signatures follow [OpenAGC](https://github.com/OpenAGC/OpenAGC/blob/main/src/game_compat.c) and [SharpProspero](https://github.com/SvenGDK/SharpProspero/blob/main/src/SharpProspero/Interop/Agc/SceAgc.cs), which agree; the SET_CONFIG_REG (0x68) packet is OpenAGC's. The driver does not execute SET_CONFIG_REG, so a submitted packet throws
 - [scePadOpen and scePadOpenExt](../../core/libs/prx/libScePad/Export.cpp) (libScePad) - special ports (type 2) return `DEVICE_NOT_CONNECTED` (0x80920007) because the host has no special controller, and `scePadGetHandle` has no handle for them; whether the console opens a handle and reports the device as disconnected later is unknown. scePadOpenExt handles only special ports. PPSA01317 passes a 16-byte param that names the device by vendor and product id (`b7 0e 04 0e ...` for 0x0eb7:0x0e04) and skips the user on any negative result. Other port types throw
 - [scePadVrControllerReadState](../../core/libs/prx/libScePad/Export.cpp) (libScePad, NID `iA-DdobUen8`) - the name hashes to the imported NID; the `(int handle, void* state)` signature follows [PS5VR](https://github.com/theghostonline/PS5VR/blob/0e408909ce7a39891a2e06eee3438d07a09e11e3/app/src/app_vr.c#L326-L369) (PPSA99177), which passes a PS VR2 Sense controller handle from `scePadOpen` type 3 or 4 and a 0x68-byte state it reads as buttons at 0, stick bytes at 4 and a connected byte at 0x40. The title calls it only after `sceHmd2Initialize` succeeds, which it does not here, so every call throws; the state layout is otherwise unknown
+- [scePadSetVibrationMode](../../core/libs/prx/libScePad/Export.cpp) (libScePad) - modes 0 to 3 are accepted and stored; the meaning of mode 3 is unknown (PPSA21480 calls it with 3 right after `scePadOpen` and aborts on failure; [SharpProspero](https://github.com/SvenGDK/SharpProspero/blob/main/src/SharpProspero/Interop/Pad/Pad.cs) names only 1 and 2). The stored mode has no other effect
 - PPSA23566 imports declared without parameters, signatures unknown: [sceAudioOut2UserGetSupportedAttributes](../../core/libs/prx/libSceAudioOut/src/AudioOut2System.cpp), [sceConvertKeycodeGetCharacterFromKeyboardData](../../core/libs/prx/libSceConvertKeycode/Export.cpp), [sce::Json::MemAllocator::notifyError](../../core/libs/prx/libSceJson2/Export.cpp), [sceNetResolverAbort](../../core/libs/prx/libSceNet/Export.cpp), [sceNpCommerceDialogOpen2](../../core/libs/prx/libSceNpCommerce/Export.cpp), [sceNpEntitlementAccessGetPftFlag](../../core/libs/prx/libSceNpEntitlementAccess/Export.cpp), [sceProprietaryVoiceChatHelper{Initialize,Terminate,SetVoiceChatState,GetVoiceChatUsageState}](../../core/libs/prx/libSceProprietaryVoiceChatHelperPrx/Export.cpp), [sceVoice{GetResourceInfo,ResetPort,EnableChat,DisableChat}](../../core/libs/prx/libSceVoice/Export.cpp). Names from the shadPS4 aerolib NID list
 - PPSA28416 imports declared without parameters, signatures unknown: [sceAudioOut2EnableChat](../../core/libs/prx/libSceAudioOut/src/AudioOut2System.cpp), imported by its bundled `party-ps5-shipping.prx`. Name from the shadPS4 aerolib NID list
 - PPSA08427 imports declared without parameters, signatures unknown: [sceNpEntitlementAccessGetGameTrialsFlag](../../core/libs/prx/libSceNpEntitlementAccess/Export.cpp), imported by its bundled `pros.sdk.Prospero.prx` and not called before the main menu. Name from the aerolib NID list