[Mobile] QNN HTP backend fails with QNN_DEVICE_ERROR_INVALID_CONFIG on Snapdragon 8 Elite (SM8750P, ro.board.platform=sun) regardless of soc_model/htp_arch value

Describe the issue

Every attempt to create an OrtSession with the QNN HTP execution provider fails identically at device creation, before GetCapability() ever evaluates model ops. This happens regardless of model precision (tested both fp32 and native fp16 ONNX models) and regardless of every combination of htp_arch / soc_model provider options tried.

Session creation itself does not throw (my app's own try/catch around createSession() never fires), so the Java-level API reports success — but GetCapability() returns zero supported nodes, causing a silent, full fallback to CPUExecutionProvider for 100% of graph nodes. This is confirmed via enableProfiling() traces: every single node across multiple full inference passes shows "provider": "CPUExecutionProvider", and the raw trace JSON contains zero occurrences of the string "QNN" anywhere.

To reproduce

1. Build an Android app targeting a Snapdragon 8 Elite (SM8750P) device with onnxruntime-android-qnn 1.27.0
2. Create an OrtSession using addQnn() with backend_path=libQnnHtp.so
3. Observe logcat during session creation

Provider options tested (all produce the identical error):

htp_arch	soc_model	enable_htp_fp16_precision	Result
(unset — auto)	(unset)	1	INVALID_CONFIG
81	(unset)	1	INVALID_CONFIG
79	(unset)	1	ParseHtpArchitecture] Invalid HTP architecture: 79 (79 not in ORT's enum — only 68/69/73/75/81 valid) → falls back to auto → INVALID_CONFIG
69	(unset)	1	INVALID_CONFIG
(unset)	69	(unset)	INVALID_CONFIG

Relevant code:

val qnnOptions = OrtSession.SessionOptions().apply { setIntraOpNumThreads(2) enableProfiling("${context.filesDir}/ort_trace") addQnn(mapOf( "backend_path" to "libQnnHtp.so", "profiling_level" to "detailed", "soc_model" to "69" )) } createdSession = ortEnv!!.createSession(modelBytes, qnnOptions)

ADSP_LIBRAR

qnn_htp_issue_report.md

Y_PATH is set explicitly before session creation via:

val nativeLibDir = context.applicationInfo.nativeLibraryDir val existingPath = "/odm/lib/rfsa/adsp;/vendor/lib/rfsa/adsp/;/system/lib/rfsa/adsp;/system/vendor/lib/rfsa/adsp;/dsp" android.system.Os.setenv("ADSP_LIBRARY_PATH", "$nativeLibDir;$existingPath", true)

Urgency

high

Platform

Android

OS Version

16 BP2A.250605.031.A3

ONNX Runtime Installation

Released Package

Compiler Version (if 'Built from Source')

No response

Package Name (if 'Released Package')

No response

ONNX Runtime Version or Commit ID

onnxruntime-android-qnn 1.27.0

ONNX Runtime API

Java/Kotlin

Architecture

X64

Execution Provider

NNAPI

Execution Provider Library Version

No response