[Nouveau] 4.20.0-rc3 nouveau/Quadro P2000 Mobile: runpm causing ACPI errors, lockups

[Michael S. Tsirkin]

On Thu, Nov 29, 2018 at 12:21:31AM +0100, Karol Herbst wrote:
> this was already debugged and there is no point in searching inside
> the Firmware. It's not a firmware bug or anything.
> 
> The proper fix is to do something inside Nouveau so that we don't
> upset the device and being able to runtime resume it again.
> 
> The initial thing we do inside Nouveau to cause those issues is to run
> that so called "DEVINIT" script inside the vbios to initialize the
> GPU, problem is, it changes something on the PCIe configuration so
> that the GPU isn't able to runtime resume anymore. I am in contact
> with Nvidia about that issue and hopefully we get the proper answers.
> When I was digging into that myself I was able to make the situation
> more stable by setting the PCIE link speed to the boot defaults, but
> that was still pretty unstable.
> 
> Anyway, because the binary driver fails here as well (through
> bumblebee and so on) there isn't much of reverse engineering we can do
> besides guessing and trying it on literally every hardware until it
> works.
> 
> We also have an upstream bug for this issue:
> https://bugzilla.kernel.org/show_bug.cgi?id=156341

If you like I can probably dump the pcie registers on card
and/or the pcie port under windows. The card works there :)
Let me know.

-- 
MST