Update Audio_privacy.md

Manual Test case - Audio Privacy (Hard Mute)

Signed-off-by: harajend <hariprasad.rajendra@intel.com>

Author: harajend

test-case/manual/Audio_privacy.md

@@ -0,0 +1,53 @@
+# Verify Audio Privacy (Hard Mute) Functionality
+Verify Audio Privacy (Hard Mute) Functionality in Linux
+
+## Preconditions
+1. The RVP should have active audio endpoints.
+2. The RVP should have a functional hard mute switch or toggle.
+3. Enable BIOS settings:
+   * Microphone Privacy Mode = "HW managed Microphone Privacy"
+   * Enable corresponding codec options, e.g., SNDW#3 [x] for SoundWire.
+   * Enable DMIC option, e.g., DMIC [x] for DMIC
+4. Make sure UCM is up to date
+   * Copy the ucm and ucm2 trees to the alsa-lib configuration directory (usually located in /usr/share/alsa) including symlinks
+   * Reference: https://github.com/alsa-project/alsa-ucm-conf/ 
+
+## Test Description
+* Verification of audio privacy (hard mute) functionality in a Linux system.
+* Should not capture audio samples when the audio privacy switch is turned ON.
+
+## Steps to Execute
+1. Turn ON the audio privacy switch. Refer to RVP TOPS documents to find the switch location.
+    Example: Switch identification mentioned as "MIC_privacy_SW_IN".
+2. Capture audio via 3.5mm jack ports:
+    ```bash
+    arecord -Dhw:0,0 -c 2 -r 48000 -f S16_LE /tmp/test_sample_mute.wav -vvv
+    ```
+3. Verify the playback for the capture in step 2:
+    ```bash
+    aplay -Dhw:0,0 -c 2 /tmp/test_sample_mute.wav -vvv
+    ```
+4. Turn OFF the audio privacy switch.
+5. Capture audio via 3.5mm jack ports:
+    ```bash
+    arecord -Dhw:0,0 -c 2 -r 48000 -f S16_LE /tmp/test_sample_unmute.wav -vvv
+    ```
+6. Verify the playback for the capture in step 5:
+    ```bash
+    aplay -Dhw:0,0 -c 2 /tmp/test_sample_unmute.wav -vvv
+    ```
+7. Repeat steps 2 and 6 for USB-A/USB-C endpoints.
+8. Repeat steps 2 to 7 using PulseAudio or PipeWire sound server.
+9. Check the dmesg log.
+10. Repeat Step 1 to 9 for DMIC (Update DMIC Audio card instead of JACK e.g. "-Dhw:0,6" ) 
+
+## Expected Results
+1. The MIC mute LED should glow.
+2. The microphone is completely disabled, and no audio is captured or transmitted.
+3. The playback should not contain audio samples.
+4. The MIC mute LED should turn OFF.
+5. The microphone is completely enabled, resuming normal functionality, capturing and transmitting audio.
+6. The playback should contain audio samples.
+7. Results should be the same as steps 2 to 6.
+8. Results should be the same as steps 2 to 7.
+9. No audio errors or failures should be present in the dmesg log.