Comment 76 for bug 2009136

Same issue on RX 470

lspci -vvvv
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev cf) (prog-if 00 [VGA controller])
 Subsystem: ASUSTeK Computer Inc. Radeon RX 470
 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 36
 Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M]
 Region 2: Memory at f0000000 (64-bit, prefetchable) [size=2M]
 Region 4: I/O ports at e000 [size=256]
 Region 5: Memory at f7e00000 (32-bit, non-prefetchable) [size=256K]
 Expansion ROM at 000c0000 [disabled] [size=128K]
 Capabilities: <access denied>
 Kernel driver in use: amdgpu
 Kernel modules: amdgpu

00:1b.0 Audio device: Intel Corporation 9 Series Chipset Family HD Audio Controller
 Subsystem: Micro-Star International Co., Ltd. [MSI] 9 Series Chipset Family HD Audio Controller
 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 44
 Region 0: Memory at f7f10000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: <access denied>
 Kernel driver in use: snd_hda_intel
 Kernel modules: snd_hda_intel

Linux rafal-MS-7917 5.19.0-40-generic #41~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Mar 31 16:00:14 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

I've tried both Displayport and HDMI. No luck.