[Bug 99482] nouveau driver returns -16 trying to hibernate

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

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https://bugs.freedesktop.org/show_bug.cgi?id=99482

--- Comment #1 from dr_bugzilla-g/b1ySJe57IN+BqQ9rBEUg@public.gmane.org ---
I confirm this bug on Xubuntu 16.04 Xenial, when using a new mainline kernel
from PPA (4.11.3-041103-generic) rather than the stock kernel. My laptop has
hybrid Intel/Nvidia graphics. Any attempts to hibernate (in my case, using
uswsusp's s2disk) fail, with control being returned to the GUI. In the kernel
log, I see the same messages as Brian does, specifically:

May 25 17:18:13 *** kernel: [ 3356.651761] nouveau 0000:01:00.0: DRM: evicting
buffers...
May 25 17:18:13 *** kernel: [ 3356.651765] nouveau 0000:01:00.0: DRM: waiting
for kernel channels to go idle...
May 25 17:18:13 *** kernel: [ 3371.651076] nouveau 0000:01:00.0: DRM: failed to
idle channel 0 [DRM]
May 25 17:18:13 *** kernel: [ 3371.651132] pci_pm_freeze():
nouveau_pmops_freeze+0x0/0x20 [nouveau] returns -16
May 25 17:18:13 *** kernel: [ 3371.651134] dpm_run_callback():
pci_pm_freeze+0x0/0xf0 returns -16
May 25 17:18:13 *** kernel: [ 3371.651136] PM: Device 0000:01:00.0 failed to
freeze async: error -16

With the older stock kernel (4.4.0-78-generic), I think that the underlying
cause of this bug was having an effect, even though I did not see these kernel
messages. I say this because hibernation with the older kernel would fail about
25% of the time, hanging the system completely (hard power-off required, all
work was lost). I believe now that this would happen because the kernel was not
able to idle nouveau but just continued the attempt to hibernate anyway. 
Also, even when hibernate succeeded, my laptop would not actually power off
when writing 'platform' to /sys/power/disk; I would either have to hold the
power button down or set /sys/power/disk to 'shutdown' instead. Again, I think
this was happening because nouveau was not being properly idled.

When I blacklist nouveau and use only Intel graphics (i915), hibernation always
works (including powering off the laptop automatically).

My nouveau is stock Xenial (version 1.0.12-1build2 of package
xserver-xorg-video-nouveau).

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