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Found interesting article although quite dated now at https://linuxreviews.org/HOWTO_undervolt_the_AMD_RX_4XX_and_RX_5XX_GPUs#cite_note-1 "Booting with amdgpu.ppfeaturemask=0xffffffff will make a special file called /sys/class/drm/card0/device/pp_od_clk_voltage appear" The "amd_shared.h" file that is set with binary code 0xffffffff doesn't appear in my file system, may be outdated from current kernel ? Anyway I got onto some other threads and ended up at https://github.com/azeam/powerupp where this method adjust settings in the "pp_table" file, which I have, but cannot be edited by Text Editor, hence the creation of this app. Also it may have something to do with "AMD Polaris Architecture" ? So anyway I have Power-Limit, GPU and Memmory setting in Advanced option at the moment, and by reducing Watt from 145 to 135 ,GPU MHz from 1350 to 1300 and Memmory MHz from 2000 to 1000, I got the desired affect, to shut the beeping on my 1000VA/550W UPS when playing high graphic games. Thanks for taking the time to help out, maybe someone can build on and provide some more info on these Advanced Settings for Corectrl Application in Pop_OS. Its a good application and currently maintained On Github; there were some older threads of "amdgpu.ppfeaturemask=0xffffffff" working in some kernels and breaking in another, it would be nice to be able to adjust the individual Voltage-States