Public bug reported:

lsb_release -rd
Description:    Ubuntu 20.04.1 LTS
Release:        20.04

uname -a
Linux patty 5.8.0-36-lowlatency #40~20.04.1-Ubuntu SMP PREEMPT Wed Jan 6 
11:10:29 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

apt-cache policy linux-image-5.8.0-36-lowlatency
linux-image-5.8.0-36-lowlatency:
  Installed: 5.8.0-36.40~20.04.1
  Candidate: 5.8.0-36.40~20.04.1
  Version table:
 *** 5.8.0-36.40~20.04.1 500
        500 http://my.archive.ubuntu.com/ubuntu focal-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status

lspci -vv 
2c:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 
10 [Radeon RX 5600 OEM/5600 XT / 5700/5700 XT] (rev ca) (prog-if 00 [VGA 
controller])
        Subsystem: ASRock Incorporation Navi 10 [Radeon RX 5600 OEM/5600 XT / 
5700/5700 XT]
        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 115
        Region 0: Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Region 2: Memory at d0000000 (64-bit, prefetchable) [size=2M]
        Region 4: I/O ports at f000 [size=256]
        Region 5: Memory at eee00000 (32-bit, non-prefetchable) [size=512K]
        Expansion ROM at eee80000 [disabled] [size=128K]
        Capabilities: [48] Vendor Specific Information: Len=08 <?>
        Capabilities: [50] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA 
PME(D0-,D1+,D2+,D3hot+,D3cold+)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [64] Express (v2) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1 
unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq+ AuxPwr- 
TransPend-
                LnkCap: Port #0, Speed 16GT/s, Width x16, ASPM L0s L1, Exit 
Latency L0s <64ns, L1 <1us
                        ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 16GT/s (ok), Width x16 (ok)
                        TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, 
NROPrPrP-, LTR+
                         10BitTagComp+, 10BitTagReq+, OBFF Not Supported, 
ExtFmt+, EETLPPrefix+, MaxEETLPPrefixes 1
                         EmergencyPowerReduction Not Supported, 
EmergencyPowerReductionInit-
                         FRS-
                         AtomicOpsCap: 32bit+ 64bit+ 128bitCAS-
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, 
OBFF Disabled
                         AtomicOpsCtl: ReqEn+
                LnkCtl2: Target Link Speed: 16GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range, 
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -3.5dB, 
EqualizationComplete+, EqualizationPhase1+
                         EqualizationPhase2+, EqualizationPhase3+, 
LinkEqualizationRequest-
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000fee00000  Data: 0000
        Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1 
Len=010 <?>
        Capabilities: [150 v2] Advanced Error Reporting
                UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
                UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- 
RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
                CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- 
AdvNonFatalErr+
                CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- 
AdvNonFatalErr+
                AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- 
ECRCChkCap+ ECRCChkEn-
                        MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
                HeaderLog: 00000000 00000000 00000000 00000000
        Capabilities: [200 v1] Resizable BAR <?>
        Capabilities: [240 v1] Power Budgeting <?>
        Capabilities: [270 v1] Secondary PCI Express
                LnkCtl3: LnkEquIntrruptEn-, PerformEqu-
                LaneErrStat: 0
        Capabilities: [2a0 v1] Access Control Services
                ACSCap: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd- 
EgressCtrl- DirectTrans-
                ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd- 
EgressCtrl- DirectTrans-
        Capabilities: [2b0 v1] Address Translation Service (ATS)
                ATSCap: Invalidate Queue Depth: 00
                ATSCtl: Enable+, Smallest Translation Unit: 00
        Capabilities: [2c0 v1] Page Request Interface (PRI)
                PRICtl: Enable- Reset-
                PRISta: RF- UPRGI- Stopped+
                Page Request Capacity: 00000100, Page Request Allocation: 
00000000
        Capabilities: [2d0 v1] Process Address Space ID (PASID)
                PASIDCap: Exec+ Priv+, Max PASID Width: 10
                PASIDCtl: Enable- Exec- Priv-
        Capabilities: [320 v1] Latency Tolerance Reporting
                Max snoop latency: 1048576ns
                Max no snoop latency: 1048576ns
        Capabilities: [400 v1] Data Link Feature <?>
        Capabilities: [410 v1] Physical Layer 16.0 GT/s <?>
        Capabilities: [440 v1] Lane Margining at the Receiver <?>
        Kernel driver in use: amdgpu
        Kernel modules: amdgpu


sensors 
amdgpu-pci-2c00
Adapter: PCI adapter
vddgfx:      775.00 mV 
fan1:           0 RPM  (min =    0 RPM, max = 3500 RPM)
edge:         +32.0°C  (crit = +118.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
junction:     +32.0°C  (crit = +99.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
mem:          +34.0°C  (crit = +99.0°C, hyst = -273.1°C)
                       (emerg = +99.0°C)
power1:       10.00 W  (cap = 180.00 W)

fan1 RPM is 0 even after I used amdgpu-fancontrol to change the fan to
39%. GPU fan is visibly spinning as expected, but hwmon still reports 0
rpm. Temperature reports are however fine and correct.

Expected result: Fan1 RPM correctly reports a non-zero value
Received result: Fan1 RPM still reports zero. 

GPU is an Asrock RX 5600 XT Phantom Gaming D3 6G OC (
https://www.asrock.com/Graphics-
Card/AMD/Radeon%20RX%205600%20XT%20Phantom%20Gaming%20D3%206G%20OC/ )

** Affects: linux-hwe (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1911656

Title:
  amdgpu hwmon reports fan at 0 rpm for Asrock Phantom Gaming RX 5600 XT
  D3 OC

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