[Nouveau] [Bug 98386] [NVE7] bus: MMIO write of FAULT at [ IBUS ], Pointer to {TDMS, flat panel) table invalid

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98386

--- Comment #2 from bruno.pagani at ens-lyon.org ---
(In reply to Ilia Mirkin from comment #1)
> (In reply to bruno.pagani from comment #0)
> > [  454.919271] nouveau 0000:02:00.0: bus: MMIO write of 00000002 FAULT at
> > 4188ac [ IBUS ]
> 
> That's bad.
> 
> 4188ac = PGRAPH.GPC_BROADCAST.FFB.PART_CONFIG
> 
> I believe we do this here:
> 
> drm/nouveau/nvkm/engine/gr/gk104.c:     nvkm_wr32(device, GPC_BCAST(0x08ac),
> nvkm_rd32(device, 0x100800));
> 
> > [  470.245180] nouveau 0000:02:00.0: bus: MMIO write of ffffff1f FAULT at
> > 6013d4 [ IBUS ]
> 
> That's bad too. This is related to the legacy 0x3d4 VGA IO port (which still
> has to be used for various display-related things). Unless you've skimped on
> the dmesg, you don't have any DCB entries and it may be reasonable to
> believe you don't have a display block at all. (I assume there are no
> outputs wired up to the NVIDIA GPU?) In that case, we should probably track
> down where we're trying to do this from and skip it. Based on the location
> in the logs, probably something VBIOS- or other early-init-related.
> 
> Unfortunately I don't have any actual debugging steps for you. Perhaps Ben
> will.

Indeed, this is an Optimus laptop with no output wired to the NVIDIA GPU.

Also, now that you mention it, the second hex chain is indeed always 6013d4 on
following attempts (only the first hex chain changes).

Will wait for Ben requests of information/debug trial then. ;)

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