How to overclock Vega on Linux...?

Hardware Hub GPU
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64

I have an issue with AMDGPU on kernel 5.0.3 after applying below custom table

#!/bin/bash
echo 300000000 > /sys/class/drm/card0/device/hwmon/hwmon0/power1_cap

echo “manual” > /sys/class/drm/card0/device/power_dpm_force_performance_level

echo “s 1 991 850” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “s 2 1084 900” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “s 3 1138 950” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “s 4 1200 975” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “s 5 1401 990” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “s 6 1536 1050” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “s 7 1630 1080” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “m 3 1100 1000” > /sys/class/drm/card0/device/pp_od_clk_voltage
fan at 100%
echo “1” > /sys/class/drm/card0/device/hwmon/hwmon0/pwm1_enable
echo “255” > /sys/class/drm/card0/device/hwmon/hwmon0/pwm1
#commit and apply max states
echo “c” > /sys/class/drm/card0/device/pp_od_clk_voltage
echo “3” > /sys/class/drm/card0/device/pp_dpm_mclk
echo “7” > /sys/class/drm/card0/device/pp_dpm_sclk

Voltage stucks at 1.2V and card heavily thermal throttles. Such table works without issues on other OS. I read thru kernel documentation at https://www.kernel.org/doc/html/latest/gpu/amdgpu.html but did not find any clue why voltages don’t apply.