PROBLEM: Re: [PATCH] pci: Rework ASPM disable code

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
stepping : 6
cpu MHz : 1596.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow
bogomips : 4799.83
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz
stepping : 6
cpu MHz : 1596.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes

cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts tpr_shadow
bogomips : 4799.83
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

   [  486.937753] vgaarb: device changed decodes: PCI:0000:01:00.0,olddecodes=none,decodes=none:owns=io+mem [  486.937781] NVRM: The NVIDIA GPU 0000:01:00.0 (PCI ID: 10de:0ca3) installed
   [  486.937782] NVRM: in this system is not supported by the 302.17 NVIDIA Linux
   [  486.937783] NVRM: graphics driver release.  Please see 'Appendix A -
   [  486.937784] NVRM: Supported NVIDIA GPU Products' in this release's README,
   [  486.937786] NVRM: available on the Linux graphics driver download page at
   [  486.937787] NVRM: www.nvidia.com.
   [  486.937797] nvidia: probe of 0000:01:00.0 failed with error -1

  01:00.0 VGA compatible controller: NVIDIA Corporation GT215 [GeForce GT 240] (rev a2) (prog-if 00 [VGA controller])
          Subsystem: ASUSTeK Computer Inc. Device 8326
          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-
          Interrupt: pin A routed to IRQ 16
          Region 0: [virtual] Memory at a0000000 (32-bit, non-prefetchable) [size=16M]
          Region 1: Memory at 80000000 (64-bit, prefetchable) [size=256M]
          Region 3: Memory at 90000000 (64-bit, prefetchable) [size=32M]
          Region 5: I/O ports at 3000 [size=128]
          [virtual] Expansion ROM at a1080000 [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: 0000000000000000  Data: 0000
          Capabilities: [78] Express (v2) Endpoint, MSI 00
                  DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s unlimited, L1 <64us ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
                  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                          RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                          MaxPayload 128 bytes, MaxReadReq 512 bytes
                  DevSta: CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend-
                  LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <1us, L1 <4us ClockPM+ Surprise- LLActRep- BwNot-
                  LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk-
                          ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                  LnkSta: Speed 2.5GT/s, Width x1, 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, EqualizationComplete-, EqualizationPhase1- EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
          Capabilities: [b4] Vendor Specific Information: Len=14 <?>
          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: [128 v1] Power Budgeting <?>
          Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1 Len=024 <?>

0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-0060 : keyboard
0064-0064 : keyboard
0070-0071 : rtc0
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : 0000:00:1f.1
0170-0177 : ata_piix
01f0-01f7 : 0000:00:1f.1
01f0-01f7 : ata_piix
0376-0376 : 0000:00:1f.1
0376-0376 : ata_piix
03c0-03df : vga+
03c0-03df : uvesafb
03f6-03f6 : 0000:00:1f.1
03f6-03f6 : ata_piix
03f8-03ff : serial
0400-047f : pnp 00:06
0400-0403 : ACPI PM1a_EVT_BLK
0404-0405 : ACPI PM1a_CNT_BLK
0408-040b : ACPI PM_TMR
0410-0415 : ACPI CPU throttle
0420-0420 : ACPI PM2_CNT_BLK
0428-042f : ACPI GPE0_BLK
0500-053f : pnp 00:06
0680-06ff : pnp 00:06
0779-0780 : pnp 00:01
0cf8-0cff : PCI conf1
1000-1fff : PCI Bus 0000:05
1100-111f : 0000:05:01.0

    1100-111f : EMU10K1

1120-1127 : 0000:05:01.1
2000-2fff : PCI Bus 0000:04
2000-201f : 0000:04:00.0
3000-3fff : PCI Bus 0000:01
3000-307f : 0000:01:00.0
4000-401f : 0000:00:1f.3
4000-401f : i801_smbus
4020-403f : 0000:00:1d.3
4020-403f : uhci_hcd
4040-405f : 0000:00:1d.2
4040-405f : uhci_hcd
4060-407f : 0000:00:1d.1
4060-407f : uhci_hcd
4080-409f : 0000:00:1d.0
4080-409f : uhci_hcd
40a0-40af : 0000:00:1f.2
40a0-40af : ata_piix
40b0-40bf : 0000:00:1f.1
40b0-40bf : ata_piix
40c0-40c7 : 0000:00:1f.2
40c0-40c7 : ata_piix

40c8-40cf : 0000:00:1f.2
40c8-40cf : ata_piix
40e0-40e3 : 0000:00:1f.2
40e0-40e3 : ata_piix
40e4-40e7 : 0000:00:1f.2
40e4-40e7 : ata_piix
5000-5fff : PCI Bus 0000:02
6000-6fff : PCI Bus 0000:03

Hello.

This patch (aka commit 3c076351c, https://lkml.org/lkml/2011/11/10/467) makes my GPU (NVidia GT 240) become undetectable by the NVidia proprietary driver. The issue used to surface before, but I resolved it by disabling ASPM altogether (adding «pcie_aspm=off» to the kernel parameter line). This no more works since the commit is in order. The driver not being loaded causes me some obvious trouble, such as uvesafb and X not being able to start.
This only happens during regular boot — if I thaw from hibernation or load the same kernel atop the currently running instance with kexec everything works fine. Upon reverting the patch and rebuilding the kernel, everything returns to normal permanently and I can live without kexec again.
Tested on 3.4.4 and 3.5.0-rc7+, everything earlier than 3.3.x works as expected (due to not having its ASPM disable code reworked).

24.07.2012, 00:17, "Rafael J. Wysocki" <[email protected]>:

Quoted 1 line

Does nouveau detect your GPU with the Matthews commit?

Yes, nouveau does work but its performance leaves a _lot_ to be wished.
I do game development and so am pretty much forced to use the proprietary driver whether I want to or not.

24.07.2012, 00:17, "Rafael J. Wysocki" <[email protected]>:

Quoted 1 line

Does nouveau detect your GPU with the Matthews commit?

Yes, nouveau does work but its performance leaves a _lot_ to be wished. I do game development and so am pretty much forced to use the proprietary driver whether I want to or not.