Hello,

I’m adjusting pp_table settings to get most out of my GPU (RX 6800 XT) and it works but every time I restart PC the changes revert back to default. Any idea how I could make them persist?

For me pp_table is located in /sys/class/drm/card1/device/pp_table

I have to use chmod to be able to make changes:

sudo chmod o+w /sys/class/drm/card1/device/pp_table

Then I’m able to write in changes with upp:

upp -p /sys/class/drm/card1/device/pp_table set --write smc_pptable/SocketPowerLimitAc/0=312 smc_pptable/SocketPowerLimitDc/0=293 smc_pptable/TdcLimit/0=300 smc_pptable/FreqTableSocclk/1=1350 smc_pptable/FreqTableFclk/1=2000 smc_pptable/FclkBoostFreq=2000

And just in case you’re wondering if the effort even makes sene, yes it does:

Max OC with LACT with max default limits (left) vs max OC with edited pp_table (right) in the picture.

  • WereCat@lemmy.worldOP
    1·
    13 hours ago

    Thanks a lot. I will look into this.

    Reason why I use chmod is because I cant for the life of me figure out why I can’t just use sudo. Even when I set environment variable for the upp.py it refuses to run it. Even when I directly want to run it via sudo it refuses, I can only run it without sudo for whatever reason… but to overwrite pp_table I need sudo privileges and I’ve been only able to get around with chmod.

    Also I’ve tried to make a script that I will just run and will execute the commands… but I get immediately hard lock and black screen and I need to do hard reset. Same when I try to copy and overwrite the pp_table with sudo priviledges with a pre-modified pp_table.

    So I’m kinda hesitant to now run the commands on runtime, it’s possible it will hardlock during boot. I will give it more though tommorrow.

    edit:

    I just found out how to write the pp_table into VBIOS so I will try flashing modified VBIOS on the card and hope it will work. I’ll leave that for tomorrow though.