Via https://bugzilla.redhat.com/show_bug.cgi?id=1047637 on this AMD-Vi box there are constant errors like the following on 3.12.5-302.fc20.x86_64: [ 7.171789] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0012 address=0x0000000000000000 flags=0x0000] [ 7.171791] AMD-Vi: Event logged [IO_PAGE_FAULT device=01:00.0 domain=0x0012 address=0x0000000000000040 flags=0x0000] IOMMU related stuff: [ 0.891828] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40 [ 0.891846] pci 0000:00:00.2: irq 72 for MSI/MSI-X [ 0.899108] AMD-Vi: Lazy IO/TLB flushing enabled [ 0.975349] PCI-DMA: Using software bounce buffering for IO (SWIOTLB) [ 0.975352] software IO TLB [mem 0xceafd000-0xd2afd000] (64MB) mapped at [ffff8800ceafd000-ffff8800d2afcfff] Nouveau related dmesg: [ 3.151771] checking generic (d8000000 300000) vs hw (d8000000 8000000) [ 3.151771] fb: conflicting fb hw usage nouveaufb vs VESA VGA - removing generic driver [ 3.174182] Console: switching to colour dummy device 80x25 [ 3.174276] pcieport 0000:00:02.0: driver skip pci_set_master, fix it! [ 3.174472] [drm] hdmi device not found 1 0 1 [ 3.174564] nouveau [ DEVICE][0000:01:00.0] BOOT0 : 0x043000a4 [ 3.174567] nouveau [ DEVICE][0000:01:00.0] Chipset: NV43 (NV43) [ 3.174569] nouveau [ DEVICE][0000:01:00.0] Family : NV40 [ 3.178621] nouveau [ VBIOS][0000:01:00.0] checking PRAMIN for image... [ 3.267873] nouveau [ VBIOS][0000:01:00.0] ... appears to be valid [ 3.267878] nouveau [ VBIOS][0000:01:00.0] using image from PRAMIN [ 3.267951] nouveau [ VBIOS][0000:01:00.0] BIT signature found [ 3.267955] nouveau [ VBIOS][0000:01:00.0] version 05.43.02.80.00 [ 3.268084] nouveau [ PFB][0000:01:00.0] RAM type: GDDR3 [ 3.268087] nouveau [ PFB][0000:01:00.0] RAM size: 128 MiB [ 3.268089] nouveau [ PFB][0000:01:00.0] ZCOMP: 378880 tags [ 3.294544] nouveau [ PTHERM][0000:01:00.0] FAN control: PWM [ 3.294556] nouveau [ PTHERM][0000:01:00.0] fan management: disabled [ 3.294559] nouveau [ PTHERM][0000:01:00.0] internal sensor: yes [ 3.314625] [TTM] Zone kernel: Available graphics memory: 8167966 kiB [ 3.314628] [TTM] Zone dma32: Available graphics memory: 2097152 kiB [ 3.314630] [TTM] Initializing pool allocator [ 3.314634] [TTM] Initializing DMA pool allocator [ 3.314642] nouveau [ DRM] VRAM: 124 MiB [ 3.314644] nouveau [ DRM] GART: 512 MiB [ 3.314648] nouveau [ DRM] TMDS table version 1.1 [ 3.314651] nouveau [ DRM] DCB version 3.0 [ 3.314653] nouveau [ DRM] DCB outp 00: 01000300 00000028 [ 3.314656] nouveau [ DRM] DCB outp 01: 04011312 00000000 [ 3.314659] nouveau [ DRM] DCB outp 02: 04011310 00000028 [ 3.314661] nouveau [ DRM] DCB outp 03: 020223f1 0040c080 [ 3.314664] nouveau [ DRM] DCB conn 00: 0000 [ 3.314666] nouveau [ DRM] DCB conn 01: 2130 [ 3.314669] nouveau [ DRM] DCB conn 02: 0210 [ 3.314671] nouveau [ DRM] DCB conn 03: 0211 [ 3.314673] nouveau [ DRM] DCB conn 04: 0213 [ 3.316351] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). [ 3.316354] [drm] No driver support for vblank timestamp query. [ 3.316400] nouveau [ DRM] 0xD625: Parsing digital output script table [ 3.366780] Switched to clocksource tsc [ 3.366795] nouveau [ DRM] 2 available performance level(s) [ 3.366801] nouveau [ DRM] 0: core 300MHz shader 300MHz memory 1000MHz voltage 1300mV fanspeed 100% [ 3.366805] nouveau [ DRM] 1: core 500MHz shader 500MHz memory 1000MHz voltage 1400mV fanspeed 100% [ 3.366809] nouveau [ DRM] c: core 299MHz shader 299MHz memory 598MHz voltage 1300mV fanspeed 100% [ 3.367495] nouveau [ DRM] MM: using M2MF for buffer copies [ 3.367501] nouveau [ DRM] Setting dpms mode 3 on TV encoder (output 3) [ 3.485551] nouveau [ DRM] allocated 1920x1080 fb: 0x9000, bo ffff88040d20f400 [ 3.485610] fbcon: nouveaufb (fb0) is primary device [ 3.505918] nouveau [ DRM] 0xD625: Parsing digital output script table [ 3.555882] Console: switching to colour frame buffer device 240x67 [ 3.557572] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device [ 3.557573] nouveau 0000:01:00.0: registered panic notifier [ 3.557577] [drm] Initialized nouveau 1.1.1 20120801 for 0000:01:00.0 on minor 0 PCI related info to 01:00.0: 01:00.0 0300: 10de:0140 (rev a2) (prog-if 00 [VGA controller]) 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 24 Region 0: Memory at f0000000 (32-bit, non-prefetchable) [size=64M] Region 1: Memory at d8000000 (64-bit, prefetchable) [size=128M] Region 3: Memory at f4000000 (64-bit, non-prefetchable) [size=16M] Expansion ROM at f5000000 [disabled] [size=128K] Capabilities: [60] Power Management version 2 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 (v1) 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 512 bytes DevSta: CorrErr- UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend- LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <256ns, L1 <4us ClockPM- Surprise- LLActRep- BwNot- LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- 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 <?> Kernel driver in use: nouveau
FYI: Switching to the proprietary nvidia driver completely eliminates the no-boot problem that is caused by Nouveau on AMD-64 8-core Vi.
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