[Bug 111762] RX 5700 XT Navi - amdgpu.ppfeaturemask=0xffffffff causes stuttering and does not unlock clock/voltage/power controls

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111762

            Bug ID: 111762
           Summary: RX 5700 XT Navi - amdgpu.ppfeaturemask=0xffffffff
                    causes stuttering and does not unlock
                    clock/voltage/power controls
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: tempel.julian at gmail.com

Hello,
with Polaris and Vega, setting amdgpu.ppfeaturemask=0xffffffff worked without
issues here: It unlocked pp_od_clk_voltage and didn't cause any issues for me.

But with Navi, it doesn't work. I'm still not allowed to open
/sys/class/drm/card0/device/pp_od_clk_voltage
as root with specifying that flag.

Also, I can't increase the GPU's power consumption, as
/sys/class/drm/card0/device/hwmon/hwmon0/power1_cap_max
only allows the default 100% Powertune limit, meaning I can't set any higher
value in
/sys/class/drm/card0/device/hwmon/hwmon0/power1_cap

Apart from not being able to change the aforementioned parameters, setting
amdgpu.ppfeaturemask=0xffffffff causes stuttering, even on the desktop and also
affects the mouse cursor.

This is with kernel drm-next-5.5-wip 73cdff347343504287feae8b36fa7317f04dcc61
and an MSI 5700 XT Gaming X.

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