[Nouveau] nouveau 1.0.17 and GT-710 (GK208B): graphics stack freezes when turning off display

[Uwe Sauter]

Hello,

I don't know if this is the appropriate list to post; if not please point me in the right direction.


I have an issue with the nouveau driver for a GT 710 (GK208B) card, hardware details and software versions below.
Once the X server decides to switch into power saving mode and turns the display off using DPMS some part of the 
graphics stack seems to freeze. I can wake up the display and it will show me the last picture but most of the 
functionality is still frozen. I can move the mouse pointer but the clock applet won't show the current time and 
selecting desktop icons does not work.
It seems that I can still start programs from the panel (I can see the process when remotely logging in) but they 
produce no graphics output.

This happens in either of the two clock settings I can set in /sys/kernel/debug/dri/0/pstate .


The proprietary driver does not show this behavior but seems to be much slower with glxgears, though this is not a 
proper benchmark, I know. The results between nouveau and nvidia are about the same when nouveau is in the low pstate 
but performance almost triples when the high pstate is configured.

I bought this card just recently because it was said to be the last model that was properly usable without the 
proprietary driver.

As you can see below, I'm already running xf86-video-nouveau 1.0.17 but compiling from git shouldn't be a problem if 
necessary.

Currently the nvidia driver is in use but I should be able to quickly switch back to nouveau for any logs that might be 
required.

Please advise what logs (and log levels) are needed in order to get to the bottom of this.


This bug reports also describes what I see:

https://gitlab.freedesktop.org/mesa/mesa/-/issues/1171#note_385608




Regards,

	Uwe



### hardware ###
CPU: AMD Ryzen 3 3100
Mainboard: Gigabyte B550M S2H, Bios F13a with AMD AGESA ComboV2 1.2.0.0
RAM: 2x 16GB Kingston DDR4 3200MHz ECC
GPU: ASUS GT710-4H-SL-2GD5, 2GB GDDR5, 4x HDMI, VideoBIOS: 80.28.b8.00.05
Display: ViewSonic VP2468
################

### software ###
Arch Linux
Kernel: 5.10.13-arch1-2
linux-firmware: 20201218.646f159-1
mate-desktop: 1.24.1-1
Mesa: 20.3.4-1
xorg-server: 1.20.10-3
xf86-video-nouveau: 1.0.17-1

alternatively:
nvidia-dkms: 460.39-1
#################

### lspci fpr GPU ###
# lspci -s 3:0.0 -v | head -n 2
#03:00.0 VGA compatible controller: NVIDIA Corporation GK208B [GeForce GT 710] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: ASUSTeK Computer Inc. Device 8770

# lspci -s 3:0.0 -vvn
03:00.0 0300: 10de:128b (rev a1) (prog-if 00 [VGA controller])
	Subsystem: 1043:8770
	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 55
	IOMMU group: 12
	Region 0: Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: Memory at fff0000000 (64-bit, prefetchable) [size=128M]
	Region 3: Memory at fff8000000 (64-bit, prefetchable) [size=32M]
	Region 5: I/O ports at f000 [size=128]
	Expansion ROM at fc000000 [virtual] [disabled] [size=512K]
	Capabilities: [60] 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: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee00000  Data: 0000
	Capabilities: [78] Express (v2) Legacy Endpoint, MSI 00
		DevCap:	MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 <64us
			ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
		DevCtl:	CorrErr- NonFatalErr- FatalErr- UnsupReq-
			RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
			MaxPayload 128 bytes, MaxReadReq 512 bytes
		DevSta:	CorrErr- NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
		LnkCap:	Port #6, Speed 5GT/s, Width x8, ASPM L0s L1, Exit Latency L0s <512ns, L1 <4us
			ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
		LnkCtl:	ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+
			ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
		LnkSta:	Speed 2.5GT/s (downgraded), Width x1 (downgraded)
			TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
		DevCap2: Completion Timeout: Range AB, TimeoutDis+ NROPrPrP- LTR-
			 10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt- EETLPPrefix-
			 EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
			 FRS-
			 AtomicOpsCap: 32bit- 64bit- 128bitCAS-
		DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR- OBFF Disabled,
			 AtomicOpsCtl: ReqEn-
		LnkCap2: Supported Link Speeds: 2.5-5GT/s, Crosslink- Retimer- 2Retimers- DRS-
		LnkCtl2: Target Link Speed: 5GT/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=01
			Status:	NegoPending- InProgress-
	Capabilities: [128 v1] Power Budgeting <?>
	Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>
	Kernel driver in use: nvidia
	Kernel modules: nouveau, nvidia_drm, nvidia
######################