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Latest Forum Posts
View PC info
Linux Distribution: Ubuntu 20.04
Graphics Card: RX 5600 XT
GPU Driver Version: AMDGPU
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
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
Last edited by Vinouch on 5 September 2020 at 5:58 pm UTC
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"I can't, as the file is not unlocked, permission deny even with root"
Elaborate on this. Does this file even exist?
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View PC info
Last edited by tuxintuxedo on 5 September 2020 at 1:36 pm UTC
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View PC info
That looks like the relevant set of patches (and more) going into drm-next-5.5.
I don't get the hostility by the way. We're just trying to help. None of this is controversial and all of the information is freely available.
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Last edited by damarrin on 5 September 2020 at 6:18 pm UTC
more info click here
Last edited by Koopacabras on 5 September 2020 at 8:18 pm UTC