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[Chris <717873@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Doing nothing special, my display flickered and those messages appeared
in the log files:

/var/log/Xorg.0.log
[ 25121.917] (WW) NVIDIA(0): The NVIDIA X driver has encountered too many errors.  Falling
[ 25121.917] (WW) NVIDIA(0):     back to write-back cached memory.

/var/log/kern.log
Feb 12 21:26:57 obiwan kernel: [25078.679920] NVRM: Xid (0001:00): 6, PE0001
Feb 12 21:26:57 obiwan kernel: [25078.701158] NVRM: Xid (0001:00): 6, PE0001
Feb 12 21:26:57 obiwan kernel: [25078.721347] NVRM: Xid (0001:00): 6, PE0001
Feb 12 21:26:57 obiwan kernel: [25078.741324] NVRM: Xid (0001:00): 6, PE0001
Feb 12 21:26:57 obiwan kernel: [25078.761275] NVRM: Xid (0001:00): 6, PE0001
Feb 12 21:26:57 obiwan kernel: [25078.781157] NVRM: Xid (0001:00): 6, PE0001
Feb 12 21:26:57 obiwan kernel: [25078.801296] NVRM: Xid (0001:00): 6, PE0001
Feb 12 21:26:57 obiwan kernel: [25078.821163] NVRM: Xid (0001:00): 6, PE0001

I'm using an (lspci -vv):
01:00.0 VGA compatible controller: nVidia Corporation G92 [Quadro FX 2800M] (rev a2) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 02ef
        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 16
        Region 0: Memory at f5000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 3: Memory at f2000000 (64-bit, non-prefetchable) [size=32M]
        Region 5: I/O ports at df00 [size=128]
        [virtual] Expansion ROM at f6e00000 [disabled] [size=128K]
        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: 0000000000000000  Data: 0000
        Capabilities: [78] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <512ns, L1 <4us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 128 bytes, MaxReadReq 256 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <1us
                        ClockPM- Surprise- LLActRep- BwNot-
                LnkCtl: ASPM L1 Enabled; RCB 128 bytes Disabled- Retrain- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Not Supported, TimeoutDis+
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
                LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
                         Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -6dB
        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: nvidia-current, nvidia-173, nouveau, nvidiafb

System is Kubuntu 10.10:
#uname -a
Linux obiwan 2.6.35-25-generic #44-Ubuntu SMP Fri Jan 21 17:40:44 UTC 2011 x86_64 GNU/Linux

The driver is
nvidia-current                           270.18-0ubuntu1~maverick~xup1

** Affects: nvidia-drivers-ubuntu
     Importance: Undecided
         Status: New

** Affects: nvidia-graphics-drivers (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: binary nvidia xorg

** Also affects: nvidia-graphics-drivers (Ubuntu)
   Importance: Undecided
       Status: New

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which is a direct subscriber.
https://bugs.launchpad.net/bugs/717873

Title:
  NVIDIA X driver causes flickering