Nouveau - Sep 2018 - [Bug 108058] New: After resuming from suspend, discrete GPU is powered on and can't be turned off

https://bugs.freedesktop.org/show_bug.cgi?id=108058

            Bug ID: 108058
           Summary: After resuming from suspend, discrete GPU is powered
                    on and can't be turned off
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: domenico.iezzi.201 at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 141734
  --> https://bugs.freedesktop.org/attachment.cgi?id=141734&action=edit
kernel log

Overall, nouveau works without problem in managing discrete GPU PM, and if I
check power consumption using powertop on a fresh boot it reports an average
battery discharge rate of ~7W like always.
After I resume the laptop from suspend, /sys/kernel/debug/vgaswitcheroo/switch
reports that the device is
dynamically turned off:

0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0

But if I check with powertop, I get a battery discharge rate of ~11W. To better
identify the problem, I tried using bumbleebee+bbswitch+nvidia-driver and see
what bbswitch module reports. On a fresh boot, it works
ok as the nouveau driver, but after resuming from suspend
/proc/acpi/bbswitch reports that the card is turned ON, and there is no way to
power it off:

[root at example user]# cat /proc/acpi/bbswitch 
0000:04:00.0 ON
[root at example user]# tee /proc/acpi/bbswitch <<<OFF
OFF
[root at example user]# cat /proc/acpi/bbswitch 
0000:04:00.0 ON

I attached the kernel log using following parameters when using only nouveau
driver (no bumblebee/bbswitch/nvidia): log_buf_len=1M nouveau.debug=debug.

System specs:
Asus Vivobook S551LN
Intel i7 4500U
NVIDIA 840M
Archlinux 4.18.9-arch1-1-ARCH (but affecting older versions, since early 4.x
version when i started using linux)

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--- Comment #1 from Tolga Cakir <cevelnet at gmail.com> ---
I might have the same issue - I posted it under bug 98386. Happens on a Dell
M3800, Intel Core i7-4702HQ, Nvidia Quadro K1100M, Arch Linux w/ kernel 4.19.2.

Same as you, after fresh boot I get around  ~7W in idle and after S3 resume I
get 15W and more, no matter how long I wait. Contrary to your observations,
bbswitch works for me; nouveau doesn't.

I have found out, that echoing lowest pstate (/sys/kernel/debug/dri/*/pstate)
after S3 resume solves this issue. Power consumption drops back to 7-8W in
idle.

I will post full dmidecode and dmesg in a couple of hours.

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--- Comment #2 from Tolga Cakir <cevelnet at gmail.com> ---
Created attachment 142575
  --> https://bugs.freedesktop.org/attachment.cgi?id=142575&action=edit
dmesg, comments at line 947 and 1051

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--- Comment #3 from Tolga Cakir <cevelnet at gmail.com> ---
Created attachment 142576
  --> https://bugs.freedesktop.org/attachment.cgi?id=142576&action=edit
dmidecode Dell M3800

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--- Comment #4 from Tolga Cakir <cevelnet at gmail.com> ---
Created attachment 142577
  --> https://bugs.freedesktop.org/attachment.cgi?id=142577&action=edit
lspci Dell M3800

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--- Comment #5 from Tolga Cakir <cevelnet at gmail.com> ---
Created attachment 142578
  --> https://bugs.freedesktop.org/attachment.cgi?id=142578&action=edit
lspci verbose Dell M3800

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--- Comment #6 from Tolga Cakir <cevelnet at gmail.com> ---
No longer occurs under stable kernel 4.20.6. Can you confirm this @Domenico?

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--- Comment #7 from Domenico Iezzi <domenico.iezzi.201 at gmail.com> ---
Still occurring to me on linux 5.0.2.

I also noticed that after resuming from suspend, if I run something with the
discrete GPU like this:

    DRI_PRIME=1 glxgears -info

the power consumption returns to normal values. This seems to be the same
behavior already noticed by @Tolga in comment #1

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #8 from Martin Peres <martin.peres at free.fr> ---
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