[Nouveau] [Bug 87361] [NV4C] GPU lock-up after booting to desktop in Fedora 20 & 21 (Nvidia Geforce 6100 IGP)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87361

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
We did make some wild assumptions that nv4c msi worked like nv4e msi. Perhaps
they were unwarranted. Could you change
drivers/gpu/drm/nouveau/core/engine/device/nv40.c to have

device->oclass[NVDEV_SUBDEV_MC     ] =  nv44_mc_oclass

instead of nv4c_mc_oclass for the 0x4c case? (and remove NvMSI=0 from your
boot)

BTW, to answer some questions from the IRC log:

<4>[    1.628331] nouveau W[     DRM] DCB type 4 not known
<4>[    1.628335] nouveau W[     DRM] Unknown-1 has no encoders, removing

This is just the DVI connector on your motherboard which is implemented as an
external encoder. nouveau doesn't support that, there's a bug open about it.

<3>[   25.103513] nouveau E[    PBUS][0000:00:0d.0] MMIO write of 0x01000001
FAULT at 0x00b000

And the others -- these come from VPE, I have no idea how they happen since I'm
sure you're not even using VPE. But I've seen them on a bunch of people's boot
logs and they appear harmless. If you wanted to disable VPE, you'd boot with
nouveau.config=PMPEG=0. However it's unlikely to have any effect. PVP=0 should
have had literally 0 effect since you don't have a (functioning) VP engine on
those boards (you have VP1, but it's wholly unsupported by nouveau).

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