[Bug 109887] vega56 undervolting/overclocking voltage issues

[Bug 109887] vega56 undervolting/overclocking voltage issues

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

            Bug ID: 109887
           Summary: vega56 undervolting/overclocking voltage issues
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: kgkggl+bugs.freedesktop.org@gmail.com

Created attachment 143547
  --> https://bugs.freedesktop.org/attachment.cgi?id=143547&action=edit
dmesg output

I overwrite "pp_od_clk_voltage" to control the voltage, but I have a problem.

The GPU voltage represents the value of
"/sys/class/drm/card0/device/hwmon/hwmon0/in0_input"

If I set "pp_od_clk_voltage" before starting Xorg/compton/WM, the GPU voltage
will be locked at 1200mv.
If I set "pp_od_clk_voltage" after starting Xorg/compton/WM, the GPU is locked
to 1200mv after a heavy load.

Unless I set "echo c > /sys/class/drm/card0/device/pp_od_clk_voltage" again,
the idle voltage will return to 900-950mv.But still higher than the set value.

Then we have a new problem.I can't control the "P7" voltage by setting
"pp_od_clk_voltage". The value in "pp_od_clk_voltage" can be changed, but the
reading is always 1200mv when the GPU jumps to "P7".

I set "P6" and "P7" to the same value to prevent the GPU from jumping to "P7"

My "pp_od_clk_voltage" setting:
OD_SCLK:
0:        852Mhz        800mV
1:        974Mhz        825mV
2:       1096Mhz        850mV
3:       1218Mhz        875mV
4:       1340Mhz        900mV
5:       1462Mhz        925mV
6:       1584Mhz        950mV
7:       1584Mhz        950mV
OD_MCLK:
0:        167Mhz        800mV
1:        500Mhz        800mV
2:        700Mhz        900mV
3:        800Mhz        950mV
OD_RANGE:
SCLK:     852MHz       2400MHz
MCLK:     167MHz       1500MHz
VDDC:     800mV        1200mV

Default "pp_od_clk_voltage" setting
OD_SCLK:
0:        852Mhz        800mV
1:        991Mhz        900mV
2:       1138Mhz        950mV
3:       1269Mhz       1000mV
4:       1312Mhz       1050mV
5:       1474Mhz       1100mV
6:       1538Mhz       1150mV
7:       1590Mhz       1200mV
OD_MCLK:
0:        167Mhz        800mV
1:        500Mhz        800mV
2:        700Mhz        900mV
3:        800Mhz        950mV
OD_RANGE:
SCLK:     852MHz       2400MHz
MCLK:     167MHz       1500MHz
VDDC:     800mV        1200mV

RYZEN 1700
MSI B350M MORTAR
PowerColor Radeon RX Vega 56

Linux 5.0.0-arch1-1-ARCH #1 SMP PREEMPT Mon Mar 4 14:11:43 UTC 2019 x86_64
GNU/Linux

Thanks!

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #1 from kgkggl+bugs.freedesktop.org@gmail.com ---
Created attachment 143548
  --> https://bugs.freedesktop.org/attachment.cgi?id=143548&action=edit
Xorg.log

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #2 from kgkggl+bugs.freedesktop.org@gmail.com ---
Created attachment 143549
  --> https://bugs.freedesktop.org/attachment.cgi?id=143549&action=edit
pp_table

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #3 from fin4478@hotmail.com ---
You need to have a kernel command line parameter and c is used to commit
changes. See: https://wiki.archlinux.org/index.php/AMDGPU#Overclocking

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #4 from kgkggl+bugs.freedesktop.org@gmail.com ---
(In reply to fin4478 from comment #3)
> You need to have a kernel command line parameter and c is used to commit
> changes. See: https://wiki.archlinux.org/index.php/AMDGPU#Overclocking

Yes, I use "c" to commit changes, the GPU frequency can always be modified, but
the voltage does not take effect.

I use parameters:

# echo s 1 974 825 > /sys/class/drm/card0/device/pp_od_clk_voltage
# echo s 2 1096 850 > /sys/class/drm/card0/device/pp_od_clk_voltage
# echo s 3 1218 875 > /sys/class/drm/card0/device/pp_od_clk_voltage
# echo s 4 1340 900 > /sys/class/drm/card0/device/pp_od_clk_voltage
# echo s 5 1462 925 > /sys/class/drm/card0/device/pp_od_clk_voltage
# echo s 6 1584 950 > /sys/class/drm/card0/device/pp_od_clk_voltage
# echo s 7 1584 950 > /sys/class/drm/card0/device/pp_od_clk_voltage
# echo c > /sys/class/drm/card0/device/pp_od_clk_voltage

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #5 from bednarczyk.pawel@outlook.com ---
Did you manage to get this resolved. I have the same issue and in my case
setting P6 = P7 Frequency, the memory clock gets stuck at P0 167 Mhz. I tried
5.1 RC-3 but no joy either.

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #6 from Jon Doane <jrdoane@gmail.com> ---
I'm also having this particular issue with a Vega 64. It appears that setting
any non-stock voltage to any of the power states will cause the voltage at any
clock to jump to 1.20v. I haven't been able to find a way around it yet.

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #7 from hagar-dunor <hagar-dunor@wanadoo.fr> ---
Met the same annoyance, and found a rather convoluted way to get around it. It
would be better overclocking/undervolting work by setting pp_od_clk_voltage
only.

https://forum.level1techs.com/t/how-to-overclock-vega-on-linux/132771/65

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #8 from Andrew Sheldon <asheldon55@gmail.com> ---
I also can confirm the problem, and it seems to have gotten worse since
5.3.0-rcX.

In past kernels, you could kind of work around it by setting slightly less
conservative undervolts and it would work. If you go past a certain point (a
point that works fine if the pp table is overridden), it would wrap around to
1.2V. For reference this around 950mv at state 6/7.

Now with 5.3, even that same relatively conservative undervolt would
immediately jump to 1.2V under load.

As hagar-dunor suggested, manually overriding the entire PP table, works around
the problem.

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #9 from Andrew Sheldon <asheldon55@gmail.com> ---
Here's a linux pp table editor that also seems to support more options (such as
raising the power cap) than OverDriveNTool:
https://github.com/amezin/powerplay-table-editor

I will note that you might still see raised voltages if you do a too aggressive
overclock/undervolt with modded PP tables, but it seems to only overvolt as
much as is needed (say 975mv -> 1.05V) if you set a too high clock, rather than
jumping to the maximum possible voltage that you see by editing
pp_od_clk_voltage.

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #10 from Andrew Sheldon <asheldon55@gmail.com> ---
(In reply to Andrew Sheldon from comment #9)
> I will note that you might still see raised voltages if you do a too
> aggressive overclock/undervolt with modded PP tables, but it seems to only
> overvolt as much as is needed (say 975mv -> 1.05V) if you set a too high
> clock, rather than jumping to the maximum possible voltage that you see by
> editing pp_od_clk_voltage.

Replying to myself here. I've found that the raised voltage occurs when forcing
GPU state to "high". If I then re-write the PP table again, it settles on the
correct voltage, and successfully switches to "high" after. I'm not sure if
this is related to some of the other voltage issues, but there you go. This
occurs on both 5.2.3 and 5.3-rc2, for the record.

I have to do this every time I force to "high", BTW.

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #11 from Stefan Springer <stefanspr94@gmail.com> ---
Loading a powerplay table only temporarily alleviates the issue. It comes back
after a while of desktop usage.

I think the culprit might be here:
https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c#L348

Why set the voltage for a state to max_vddc in the first place?

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #12 from Stefan Springer <stefanspr94@gmail.com> ---
Actually, it gets reset to 1200mV every time the resolution changes. I.e. when
launching a fullscreen game or restarting the display manager.

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

Stefan Springer <stefanspr94@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wslatem@gmail.com

--- Comment #13 from Stefan Springer <stefanspr94@gmail.com> ---
*** Bug 110113 has been marked as a duplicate of this bug. ***

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[Bug 109887] vega56 undervolting/overclocking voltage issues

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #14 from Stefan Springer <stefanspr94@gmail.com> ---
*** Bug 110347 has been marked as a duplicate of this bug. ***

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[Bug 109887] [Vega10][powerplay] P7 gets reset to max_vddc (1.2V/1.25V) after applying any custom settings via pp_od_clk_voltage and/or pp_table

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

Stefan Springer <stefanspr94@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|vega56                      |[Vega10][powerplay] P7 gets
                   |undervolting/overclocking   |reset to max_vddc
                   |voltage issues              |(1.2V/1.25V) after applying
                   |                            |any custom settings via
                   |                            |pp_od_clk_voltage and/or
                   |                            |pp_table

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[Bug 109887] [Vega10][powerplay] P7 gets reset to max_vddc (1.2V/1.25V) after applying any custom settings via pp_od_clk_voltage and/or pp_table

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

--- Comment #15 from Stefan Springer <stefanspr94@gmail.com> ---
The patch Pelle van Gils proposed here works flawlessly for me:
https://bugzilla.kernel.org/show_bug.cgi?id=205277

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[Bug 109887] [Vega10][powerplay] P7 gets reset to max_vddc (1.2V/1.25V) after applying any custom settings via pp_od_clk_voltage and/or pp_table

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

haro41@gmx.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugzilla.kernel.org
                   |                            |/show_bug.cgi?id=205277

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[Bug 109887] [Vega10][powerplay] P7 gets reset to max_vddc (1.2V/1.25V) after applying any custom settings via pp_od_clk_voltage and/or pp_table

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https://bugs.freedesktop.org/show_bug.cgi?id=109887

haro41@gmx.de changed:

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

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