How to make amdgpu.ppfeaturemask work with kernel 5.4.0 of ubuntu 20.04?

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I can unlock the access to adjust clocks and voltages of my AMD GPU by appending the Kernel parameter amdgpu.ppfeaturemask=0xffffffff with kernel 5.8.x of Ubuntu 20.04 but not with kernel 5.4. Why not with kernel 5.4 ? With kernel 5.8, I can edit the file /sys/class/drm/card0/device/pp_od_clk_voltage but with kernel 5.4, I can't, as the file is not unlocked, permission deny even with root. I confirm I update grub after each modify. I followed the procedure from: https://wiki.archlinux.org/index.php/AMDGPU

Wiki Achlinux: ยง OverclockingSince Linux 4.17, it is possible to adjust clocks and voltages of the graphics card via /sys/class/drm/card0/device/pp_od_clk_voltage.

Some of my data:

$ cat /etc/default/grub | grep GRUB_CMDLINE_LINUX_DEFAULT
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.ppfeaturemask=0xffffffff"
$ ls /sys/class/drm/card0/device | grep pp_od
pp_od_clk_voltage
$ cat /sys/class/drm/card0/device/pp_od_clk_voltage
$ uname -a
Linux ASUS-xxx 5.4.0-45-generic #49-Ubuntu SMP Wed Aug 26 13:38:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
ubuntu
kernel
overclocking
asked on Super User Sep 5, 2020 by NicolasSmith • edited Sep 5, 2020 by NicolasSmith

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