I have laptop with AMD A9-9420 cpu and discrete r5 m330.

01:00.0 0380: 1002:6660 (rev 83)
        Subsystem: 103c:8331
        Physical Slot: 0
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 32
        Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Region 2: Memory at f0400000 (64-bit, non-prefetchable) [size=256K]
        Region 4: I/O ports at 4000 [size=256]
        Expansion ROM at f0440000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: radeon
        Kernel modules: radeon, amdgpu

Integrated gpu works flawlessly, but running something with DRI_PRIME=1 causes
gpu hung after some time(from 30s to few minutes). this happens on BOTH radeon
and amdgpu modules. Disabling dpm prevents hung for both drivers, but makes gpu
useless because little default clocks.
Kernel parametres I'm using right now: radeon.dpm=0 amdgpu.dpm=1 amdgpu.dc=1
amdgpu.gpu_recovery=1
Also tried with amdgpu.si_support=1 radeon.si_support=0 but as I sain before
problem happens with both modules.
this happens on all kernels i tried. 4.9 is oldest i can install, because wifi
driver woks only on post 4.9 kernels