General Mobile GM9 PRO
Android 9.0 stock, Wired HD Snapdragon output
Snapdragon 660
has 24bit 384kHz but in policy, it has 32bit 384kHz too. (its listed under Qualcomm's page)
audio_output_policy.conf
Android One - General Mobile 5 Plus (shamrock)
Android 7.0 (it was working on Android 6.0 24 bit 192khz)(both stock)
Working=6.0 and build 703
Not working =7.0 and build 704 (no option on 703)
I bought unlocker.
Snapdragon 617 internal DAC (i dont know its name, and i'm not rooted for copying the policy file)