My RX480 does not have this issue on v4.13-rc3. Here's the lspci output:
$ lspci -vvnn -s 27:00.0
27:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Ellesmere [Radeon RX 470/480] [1002:67df] (rev c7) (prog-if 00 [VGA
controller])
Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Radeon RX 480
[1002:0b37]
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 58
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 fe800000 (32-bit, non-prefetchable) [size=256K]
Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: amdgpu
Kernel modules: amdgpu
You need to file an upstream bug at https://bugzilla.freedesktop.org/
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https://bugs.launchpad.net/bugs/1720622
Title:
Cannot wake-up from sleep mode
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