Nouveau - Jul 2018 - [Bug 107325] New: Reported temperature of nvidia card with nouveau driver is wrong

https://bugs.freedesktop.org/show_bug.cgi?id=107325

            Bug ID: 107325
           Summary: Reported temperature of nvidia card with nouveau
                    driver is wrong
           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: j.novak at netsystem.cz
        QA Contact: xorg-team at lists.x.org

Hello,

  I use Dell Precision 3530 with NVIDIA Corporation GP107GLM [Quadro P600
Mobile] (rev a1). I use Fedora Core 28 with 4.17.6 x86_64 kernel.
  I found that sensors tool shows wrong temperature:

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:       +511.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

  Temperature is obviously wrong.
  I tried to troubleshoot it on sensors side and it looks that sensors tool
receives this wrong value from driver.
  I made one more observation - right after suspend/wakeup the value is
completely different:

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:       +511.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:        +43.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

$ sensors
nouveau-pci-0100
Adapter: PCI adapter
temp1:       +511.0°C  (high = +95.0°C, hyst =  +3.0°C)
                       (crit = +105.0°C, hyst =  +5.0°C)
                       (emerg = +135.0°C, hyst =  +5.0°C)

  I can provide more information when required.

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Rhys Kidd <rhyskidd at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |rhyskidd at gmail.com

--- Comment #1 from Rhys Kidd <rhyskidd at gmail.com> ---
Thanks for the bug report Jirka,

It would be helpful if you could download and build a nouveau-related debug
toolkit, envytools [0], and run the following commands (inside the nva/
subfolder):

$ ./nvapeek 0x020460

$ ./nvapeek 0x020400

It would also be helpful to see a copy of your GPU's VBIOS attached here.
This
can be produced by running the below command:

$ cat /sys/kernel/debug/dri/0/vbios.rom > vbios.rom


[0] https://github.com/envytools/envytools

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Perhaps when it's runtime-suspended, the readings return all 1's, and we
report
511 (0x1ff). Or some variation thereof.

Jirka - if you boot with nouveau.runpm=0, I suspect the temperature will be
fine -- good to check though.

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--- Comment #3 from Jirka Novak <j.novak at netsystem.cz> ---
Hi,
> It would be helpful if you could download and build a nouveau-related debug
> toolkit, envytools [0], and run the following commands (inside the nva/
> subfolder):
> 
> $ ./nvapeek 0x020460
> 
> $ ./nvapeek 0x020400
Output is there, but I see different output for subsequent calls:

# nvapeek 0x020460
00020460: 20003170
# nvapeek 0x020460
00020460: 20003180
# nvapeek 0x020460
00020460: 200031a8
# nvapeek 0x020460
00020460: 200031a0
# nvapeek 0x020460
00020460: 200031e8

# nvapeek 0x020400
00020400: 00000030
# nvapeek 0x020400
00020400: 00000031
# nvapeek 0x020400
00020400: 00000031
# nvapeek 0x020400
00020400: 00000031
# nvapeek 0x020400
00020400: 00000031
# nvapeek 0x020400
00020400: 00000032
> It would also be helpful to see a copy of your GPU's VBIOS attached
here. This
> can be produced by running the below command:
> 
> $ cat /sys/kernel/debug/dri/0/vbios.rom > vbios.rom
File is attached.

                                        Best regards,

                                                        Jirka Novak

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--- Comment #4 from Jirka Novak <j.novak at netsystem.cz> ---
Hi,
> Perhaps when it's runtime-suspended, the readings return all 1's,
and we report
> 511 (0x1ff). Or some variation thereof.
> 
> Jirka - if you boot with nouveau.runpm=0, I suspect the temperature will be
> fine -- good to check though.
yes, you are correct. It then returns 49-50 degrees.

                                                Best regards,

                                                        Jirka Novak

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Pacho Ramos <pachoramos1 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |pachoramos1 at gmail.com

--- Comment #5 from Pacho Ramos <pachoramos1 at gmail.com> ---
I have the same issue with kernel 4.19.30 still

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--- Comment #6 from Karol Herbst <karolherbst at gmail.com> ---
this is a runtime suspend issue. While the GPU is suspended the temperature
reading fails, but we don't actually check for that, so we return the error
value (-1 & 0x1ff = 511).

I think I had a patch for that somewhere, let me see.

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--- Comment #7 from Roy <nouveau at spliet.org> ---
Will this bug interact with Lyude's recent patch, "drm/nouveau/i2c:
Disable i2c
bus access after ->fini()"?

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--- Comment #8 from Karol Herbst <karolherbst at gmail.com> ---
no. This was mainly for displays afaik and we read out the temperature through
MMIO.

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

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

--- Comment #9 from Martin Peres <martin.peres at free.fr> ---
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