Kernel log relevant part:

Apr  5 15:37:00 rygel kernel: [ 2925.004224] pcieport 0000:00:01.0: PME: Spurious native interrupt!
Apr  5 15:37:25 rygel kernel: [ 2949.648804] pcieport 0000:00:01.0: PME: Spurious native interrupt!
Apr  5 15:37:36 rygel kernel: [ 2960.804915] pcieport 0000:00:01.0: PME: Spurious native interrupt!
Apr  5 15:37:48 rygel kernel: [ 2973.253151] pcieport 0000:00:01.0: PME: Spurious native interrupt!
Apr  5 15:38:00 rygel kernel: [ 2984.989466] pcieport 0000:00:01.0: PME: Spurious native interrupt!
Apr  5 15:41:38 rygel kernel: [ 3202.837449] pcieport 0000:00:01.0: PME: Spurious native interrupt!
Apr  5 15:42:17 rygel kernel: [ 3241.782062] pcieport 0000:00:01.0: PME: Spurious native interrupt!
Apr  5 15:42:57 rygel kernel: [ 3282.354685] NVRM: GPU at PCI:0000:01:00: GPU-78091d7e-2007-c450-19a1-f764cae07b00
Apr  5 15:42:57 rygel kernel: [ 3282.354689] NVRM: Xid (PCI:0000:01:00): 79, pid='<unknown>', name=<unknown>, GPU has fallen off the bus.
Apr  5 15:42:57 rygel kernel: [ 3282.354691] NVRM: GPU 0000:01:00.0: GPU has fallen off the bus.
Apr  5 15:42:57 rygel kernel: [ 3282.354730] NVRM: A GPU crash dump has been created. If possible, please run
Apr  5 15:42:57 rygel kernel: [ 3282.354730] NVRM: nvidia-bug-report.sh as root to collect this data before
Apr  5 15:42:57 rygel kernel: [ 3282.354730] NVRM: the NVIDIA kernel module is unloaded.
Apr  5 15:43:02 rygel kernel: [ 3287.474709] NVRM: Error in service of callback 
Apr  5 15:48:05 rygel kernel: [ 3590.071558] Asynchronous wait on fence NVIDIA:nvidia.prime:11cbb timed out (hint:intel_atomic_commit_ready [i915])

Please note, that the "Spurious native interrupt" thing may or may not be related, I see those since the very beginning all the time, when I first used this notebook, it seems it's a constant thing. So maybe that could be ignored though. Like that, this line:

Mar  3 10:13:07 rygel kernel: [  634.685830] workqueue: pm_runtime_work hogged CPU for >11428us 16 times, consider switching to WQ_UNBOUND

is also a very frequent guest of mine :) since ages, no idea what it means though, or connected to the problem or not.


lspci:


01:00.0 3D controller: NVIDIA Corporation TU117M [GeForce MX550] (rev a1)
	Subsystem: Dell Device 0b0f
	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
	Interrupt: pin A routed to IRQ 190
	IOMMU group: 18
	Region 0: Memory at 8e000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at 6000000000 (64-bit, prefetchable) [size=256M]
	Region 3: Memory at 6010000000 (64-bit, prefetchable) [size=32M]
	Region 5: I/O ports at 3000 [size=128]
	Capabilities: [60] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee00b18  Data: 0000
	Capabilities: [78] Express (v2) Endpoint, MSI 00
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 <64us
			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 75.000W
		DevCtl:	CorrErr- NonFatalErr- FatalErr- UnsupReq-
			RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+ FLReset-
			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 <512ns, L1 <16us
			ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
		LnkCtl:	ASPM Disabled; RCB 64 bytes, Disabled- CommClk+
			ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s (downgraded), Width x4 (downgraded)
			TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- LTR+
			 10BitTagComp+ 10BitTagReq- OBFF Via message, ExtFmt- EETLPPrefix-
			 EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
			 FRS- TPHComp- ExtTPHComp-
			 AtomicOpsCap: 32bit- 64bit- 128bitCAS-
		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR+ OBFF Disabled,
			 AtomicOpsCtl: ReqEn-
		LnkCap2: Supported Link Speeds: 2.5-16GT/s, Crosslink- Retimer+ 2Retimers+ DRS-
		LnkCtl2: Target Link Speed: 16GT/s, EnterCompliance- SpeedDis-
			 Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
			 Compliance De-emphasis: -6dB
		LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete+ EqualizationPhase1+
			 EqualizationPhase2+ EqualizationPhase3+ LinkEqualizationRequest-
			 Retimer- 2Retimers- CrosslinkRes: unsupported
	Capabilities: [100 v1] Virtual Channel
		Caps:	LPEVC=0 RefClk=100ns PATEntryBits=1
		Arb:	Fixed- WRR32- WRR64- WRR128-
		Ctrl:	ArbSelect=Fixed
		Status:	InProgress-
		VC0:	Caps:	PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
			Arb:	Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
			Ctrl:	Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
			Status:	NegoPending- InProgress-
	Capabilities: [250 v1] Latency Tolerance Reporting
		Max snoop latency: 34326183936ns
		Max no snoop latency: 34326183936ns
	Capabilities: [258 v1] L1 PM Substates
		L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
			  PortCommonModeRestoreTime=255us PortTPowerOnTime=10us
		L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
			   T_CommonMode=0us LTR1.2_Threshold=281600ns
		L1SubCtl2: T_PwrOn=10us
	Capabilities: [128 v1] Power Budgeting <?>
	Capabilities: [420 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: [600 v1] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
	Capabilities: [900 v1] Secondary PCI Express
		LnkCtl3: LnkEquIntrruptEn- PerformEqu-
		LaneErrStat: 0
	Capabilities: [bb0 v1] Physical Resizable BAR
		BAR 0: current size: 16MB, supported: 16MB
		BAR 1: current size: 256MB, supported: 64MB 128MB 256MB
		BAR 3: current size: 32MB, supported: 32MB
	Capabilities: [c1c v1] Physical Layer 16.0 GT/s <?>
	Capabilities: [d00 v1] Lane Margining at the Receiver <?>
	Capabilities: [e00 v1] Data Link Feature <?>
	Kernel driver in use: nvidia
	Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia