[Bug 86503] New: Discrete card seems to be powered on even if reported as Off

[Bug 86503] New: Discrete card seems to be powered on even if reported as Off

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=86503

            Bug ID: 86503
           Summary: Discrete card seems to be powered on even if reported
                    as Off
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: mszpak-5tc4TXWwyLM@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Following up Bug 70895.

On Fedora 21 with 3.17.3-300.fc21.x86_64 when booting with nouveau.runpm=0 I
have both cards on:
$ $ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Pwr:0000:01:00.0

and after:
# echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

I have:
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0

Looks ok, but I still see 3 providers:
$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x90 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
3 outputs: 5 associated providers: 2 name:Intel
Provider 1: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
Provider 2: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload
crtcs: 2 outputs: 2 associated providers: 2 name:nouveau

and system temperature could suggest that the card is still on.

When I use (on the second kernel) bbswitch with bumblebee I see only one
provider and the temperature is a few (~6) degrees lower.

I see no messages from VGA switcheroo in the system log (as there were in
3.11.6). Can I make output more verbose or do something else to provide more
details about the situation?


System specification:
Asus N43SN
GeForce GT 550M + integrated Intel card using i915 driver (NVidia Optimus)
kernel-3.17.3-300.fc21.x86_64
xorg-x11-drv-nouveau-1.0.11-1.fc21.x86_64
xorg-x11-server-Xorg-1.16.1-1.fc21.x86_64

Btw, on that system there is also problem with auto-suspending (with not
disabled nouveau.runpm) - a card is always in DynPwr - Bug 70875.

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[Bug 86503] Discrete card seems to be powered on even if reported as Off

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https://bugs.freedesktop.org/show_bug.cgi?id=86503

--- Comment #1 from fredgib-GANU6spQydw@public.gmane.org ---
I have the same problem but found a workaround that may give a hint to
developers.

My system is an up-to-date Kali Linux (kernel 4.16, nouveau package:
'xserver-xorg-video-nouveau/kali-rolling,now 1:1.0.15-2 amd64'). I don't have
bumblebee or prime installed.

If I don't blacklist nouveau in /etc/modprobe.d/, there are 2 possibilities:
- either I disable runtime management in the kernel options of
/etc/default/grub, then the discrete card will be on (vgaswitcheroo would say
'Pwr') and I can turn it off by writing in vgaswitcheroo/switch.
- or I don't disable runtime management, then vgaswitcheroo indicates "DynPwr"
and whatever I do, I cannot change that state.

In both cases, the power consumption remains the same, typical of when the
discrete card is on.

Now my preferred scenario, explaining the workaround:

If I blacklist nouveau in /etc/modprobe.d/ and reboot, I still have a high
consumption, typical of when the discrete card is on. I have only one provider
indicated by xrandr (the integrated i915 in modesetting) and
/sys/kernel/debug/vgaswitcheroo/switch does not exist. THEN I launch nouveau
("sudo modprobe nouveau") and that's it: my consumption is 5 Watts less
(typical of what I had with bumblebee and bbswitch before), vgaswitcheroo
indicates "DynOff".

There is however a limitation: if I connect an HDMI screen (knowing the HDMI
port of my laptop is fostered by the discrete card) and use it with 'xrandr
--setprovideroutputsource 1 0', nouveau will automatically turn on the discrete
card (and switcheroo will indicate "DynPwr"), but there is no return; the
discrete card will remain ON, whatever I do (I even tried to 'sudo modprobe
bbswitch' at that point and write "OFF" in /proc/acpi/bbswitch).

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[Bug 86503] Discrete card seems to be powered on even if reported as Off

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https://bugs.freedesktop.org/show_bug.cgi?id=86503

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

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

--- Comment #2 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/152.

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