[Bug 205977] New: [amdgpu] Vega10 dpm defaults cause card to overvolt and overboost

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205977

            Bug ID: 205977
           Summary: [amdgpu] Vega10 dpm defaults cause card to overvolt
                    and overboost
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4.6-gentoo
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: stefanspr94 at gmail.com
        Regression: No

On a Vega 64 with completely stock settings, boost clocks of 1800mhz+ can be
observed when running Minecraft with shader mod or Outward (DXVK) or any OpenCL
workload, sometimes leading to driver crashes. When no changes to overdrive
settings are made, AVFS will also overvolt the card accordingly (I've seen up
to 1.35V Vcore). This can potentially damage the hardware.

When disabling AVFS through enabling ppfeaturemask=fffd7fff and using a custom
pp_table, the max voltage of 1.2V is respected, but the core clocks are still
exceeded like before.

But there is a workaround: pp_table + echoing "profile_peak" or "high" to
"power_dpm_force_performance_level", leads to max clocks AND voltages being
respected. Even when setting it to "auto" afterwards. Maybe this points to
where to look for the bug.

This is also an issue under Windows, so hopefully resolving this bug on Linux
will also lead to a fix on that platform (I figure, there is some code sharing,
considering I get the same behavior on both). This behaviour is present since
the launch of Vega.

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