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Add manual test case for DMIC capture #1247

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Add manual test case for DMIC capture #1247

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42 changes: 42 additions & 0 deletions test-case/manual/check-DMIC-capture-2ch-4ch.md
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# Check DMIC 2ch/4ch

Verification of 2ch/4ch DMIC recording
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Could add a note this is specifically to test recording with PCH-connected DMIC. There are also configurations where a digital mic is connected to a codec, and those are separate cases.


## Preconditions
1. The system is powered on.
2. A Linux-based system with Realtek AIOC and transducer card is available
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To be precise, a system with PCH DMIC connected (Realtek AIOC is one option but there are many other).



## Test Description
* Verification of 2ch/4ch DMIC recording
* Recording should happen without any issue
* Playback should be smooth without any glitches or noise.

## Recording via 2ch/4ch DMIC
1. Verify dmic device list.
```bash
arecord -l
```
2. Capture audio using dmic device:
```bash
arecord -Dhw:0,0 -c 2 -r 48000 -f S24_LE -d 20 test.wav -vvv for 2Ch
arecord -Dhw:0,6 -c 4 -r 48000 -f S32_LE -d 15 test3.wav -vvv for 4ch
```
3. Play and verify the audio file recorded in step 3:
```bash
aplay -Dhw:0,0 -c 2 -r 48000 -f S24_LE test.wav -vvv
```
Note : 4ch dmic recording copy in IT laptop and play & verify
```
4. Check the dmesg log:
```bash
dmesg | grep -E "snd|sof|soc" | grep -i error
```


## Expected Results
1. DMIC devices should list
2. Audio capture should happen without any issues
3. Playback should be smooth without any glitch
4. No audio errors or failures should be present in the dmesg log.