[Bug 100228] [NV137] bus: MMIO read of 00000000 FAULT at 409800 [ TIMEOUT ]

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=100228

--- Comment #44 from Andrey Melentyev <andrey+freedesktop-TVrNfIo4idvLoDKTGw+V6w@public.gmane.org> ---
Got some time to test runpm_fixes branch by Karol Herbst:
https://github.com/karolherbst/linux/commits/runpm_fixes

Applying the two latest commits bbb0b9a16c86fc54fe296df73000da3fba4e91b6 and
749a9c843f646ceac39e14601b64e5bbf202a47c from this branch to kernel version
5.3.8 allows me to use nouveau on Thinkpad X1 Extreme Gen 1 laptop with GP107M
[GeForce GTX 1050 Ti Mobile] (rev a1)

What works

- Offloading with DRI_PRIME
- Reverse PRIME: HDMI port wired to the NVIDIA GPU works
- Power management (see note below)
- Suspend and resume

I was testing under X11 with modesetting DDX for both iGPU and dGPU. Haven't
tried Wayland or any sort of video decoding acceleration.

Power management

After loading nouveau module, idle dGPU doesn't power down, albeit power
control is set to "auto" for both the GPU and its audio device via sysfs. This
can be worked around by setting the power to on and then back to auto:

echo -n "on" >/sys/bus/pci/devices/0000:01:00.1/power/control && echo -n "auto"
>/sys/bus/pci/devices/0000:01:00.1/power/control

Once the idle audio device and GPU itself are powered down correctly, I get
power usage similar (same?) to when bbswitch is used.

Not sure if https://bugzilla.kernel.org/show_bug.cgi?id=156341 is relevant
here.

Thanks Karol and everyone involved, hope to see it mainlined eventually.

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