very low volume with DCV turned on with Hi-res Output USB DAC even at default settings.

[Yukito Yukaza]

very low volume with DCV turned on with Hi-res Output USB DAC even at default settings.

945
alioth (Poco F3)
Android 12 (MIUI Global 3.0.6)

steps I've tried
restarting phone
reinstalling the app
tried using other apps like HiBy Music DAC DVC works on other app just fine, its just Poweramp could not do it properly.

[maxmp]

@Yukito Yukaza low volume with DVC enabled means DVC doesn't work. In case of Bluetooth - this is due to the Absolute Volume (see Direct Volume Control settings page in Poweramp). In case of Hi-Res output - DVC + Hi-Res not supported in your firmware, at least for the selected sample rate.

 

[Yukito Yukaza]

Not using BT, just USB DAC CX31993.

Found a way to recreate it.

Settings>audio>dvc>toggle dvc off and on this will do the weak volume and if you max the volume while in this way the distortion starts at 70% volume and will remain like this even if you reinstall or restart the phone or unplug and replug the usb dac.

Also found a way to fix it lelz

Settings>audio>output>high-res output>usb dac>toggle no dvc on and off.

It just fixed itself even when you unplug and plug in the usb dac.

I would know if its in direct mode since wavelet and built-in dolby atmos doesn't affect it. 

This is the audio log, when its fixed. Oddly no changes in the log when the low volume bug occurred.

Spoiler

07:55:11.931 build-945-bundle-play
Device: POCO Xiaomi M2012K11AG alioth_global alioth "qcom" alioth SKQ1.211006.001 test-keys [arm64-v8a, armeabi-v7a, armeabi]

kona is_snapdragon
MIUI=13
FAILED to read /vendor/etc/audio_output_policy.conf
reading /vendor/etc/audio_io_policy.conf
has direct_pcm_24, sampling_rates=44100|48000|88200|96000|176400|192000|352800|384000
AUDIO_OUTPUT_FLAG_DIRECT direct_pcm_24
has direct_pcm_24 formats=AUDIO_FORMAT_PCM_16_BIT|AUDIO_FORMAT_PCM_24_BIT_PACKED|AUDIO_FORMAT_PCM_8_24_BIT|AUDIO_FORMAT_PCM_32_BIT
FLAG_VARIANT_DIRECT_HD via direct_pcm_24
=> FLAG_VARIANT_DIRECT_HD_MIUI_STREAM_12 build_date_utc=1666869822
=> MIUI FLAG_NEEDS_DEEP_BUFFER
USB can handle Hi-Res - sdk=31
>>>OK flags=0x125541e600008000
FLAG_VARIANT_DIRECT_HD_MIUI_STREAM_12
FLAG_SUPPORTS_PCM_8_24
FLAG_SUPPORTS_PCM_24
FLAG_SUPPORTS_PCM_32
FLAG_ALLOW_PCM_32
FLAG_SUPPORTS_UNITY_GAIN_STREAM
FLAG_SUPPORTS_USB
FLAG_NEEDS_EXTRA_SLEEPS
FLAG_SUPPORTS_SPEAKER
FLAG_SUPPORTS_LDAC
FLAG_NEEDS_DEEP_BUFFER
FLAG_ALLOW_DVC_EFFECT
PA_OUTPUT_CAP_NEEDS_VOL_UI
INTERNAL_OUTPUT_FLAG_SR_384K
INTERNAL_OUTPUT_FLAG_SR_352K
INTERNAL_OUTPUT_FLAG_SR_192K
INTERNAL_OUTPUT_FLAG_SR_176K
INTERNAL_OUTPUT_FLAG_SR_96K
INTERNAL_OUTPUT_FLAG_SR_88K
INTERNAL_OUTPUT_FLAG_SR_48K
INTERNAL_OUTPUT_FLAG_SR_44K
 

 

[maxmp]

@Yukito Yukaza in this case DVC + Hi-Res doesn’t work - either use standard definition audio output or disable DVC (better to use No DVC per output option).

Obviously, with no DVC you can’t apply deep equalization/tone and your overal volume is reduced by “No DVC Gain” which can be set to 0db to match other apps. Thanks!

[Yukito Yukaza]

@maxmp it does work now, I would know if its using high res due to the light indicator at the usb dac or screen at my fiio brt7, I just need to do this Settings>audio>output>high-res output>usb dac>toggle "no dvc" on then back to off.  just do that trick to xiaomi/poco MIUI 12 and up.

another is just restart the phone. if the toggling doesn't work.

no problems on my LG v60,

my samsung a30 and its locked at 24bit 192kHz.
for samsung there's a conflict built-in software, settings>sound and vibration>sound quality and effects> UHQ upscaler dolby atmos and you can't turn this off, it will always stay on one you go back to the page or refresh the menu.