Raising the power limit on my AMD RedDevil 6900XT

Support Graphics & Display
1

Hello everyone. I am trying to raise the power limit on my AMD GPU. I’ve tried CoreCtrl, but it didn’t let me raise it as high as I wanted. I also tried to change it like the arch wiki mentions on the manual overclocking section, but it seemingly doesn’t support going higher than 293W? I know that my card can handle close to 340W (that’s around the point I had while I was on Windows).

Any and all help appreciated.

~ screenfetch
 ██████████████████  ████████     monni@monni-monjaro
 ██████████████████  ████████     OS: Manjaro 22.1.0 Talos
 ██████████████████  ████████     Kernel: x86_64 Linux 6.1.25-1-MANJARO
 ██████████████████  ████████     Uptime: 1h 10m
 ████████            ████████     Packages: 1520
 ████████  ████████  ████████     Shell: zsh 5.9
 ████████  ████████  ████████     Resolution: 6560x2560
 ████████  ████████  ████████     DE: KDE 5.104.0 / Plasma 5.27.4
 ████████  ████████  ████████     WM: KWin
 ████████  ████████  ████████     GTK Theme: Breeze [GTK2/3]
 ████████  ████████  ████████     Icon Theme: candy-icons
 ████████  ████████  ████████     Disk: 383G / 924G (44%)
 ████████  ████████  ████████     CPU: AMD Ryzen 9 3900X 12-Core @ 24x 3.8GHz
 ████████  ████████  ████████     GPU: AMD Radeon RX 6900 XT (navi21, LLVM 15.0.7, DRM 3.49, 6.1.25-1-MANJARO)
                                  RAM: 4082MiB / 15881MiB

~ inxi -a -G
Graphics:
  Device-1: AMD Navi 21 [Radeon RX 6800/6800 XT / 6900 XT] vendor: Tul /
    PowerColor Red Devil driver: amdgpu v: kernel arch: RDNA-2 code: Navi-2x
    process: TSMC n7 (7nm) built: 2020-22 pcie: gen: 4 speed: 16 GT/s
    lanes: 16 ports: active: DP-1,DP-2 empty: DP-3,HDMI-A-1 bus-ID: 0c:00.0
    chip-ID: 1002:73bf class-ID: 0300
  Device-2: Logitech C922 Pro Stream Webcam type: USB
    driver: snd-usb-audio,uvcvideo bus-ID: 7-2:2 chip-ID: 046d:085c
    class-ID: 0102 serial: AA79661F
  Display: x11 server: X.Org v: 21.1.8 with: Xwayland v: 23.1.1
    compositor: kwin_x11 driver: X: loaded: amdgpu unloaded: modesetting,radeon
    alternate: fbdev,vesa dri: radeonsi gpu: amdgpu display-ID: :0 screens: 1
  Screen-1: 0 s-res: 6560x2560 s-dpi: 96 s-size: 1735x677mm (68.31x26.65")
    s-diag: 1862mm (73.32")
  Monitor-1: DP-1 mapped: DisplayPort-0 pos: primary,bottom-l
    model: Samsung LC49G95T serial: H4ZN601010 built: 2020 res: 5120x1440
    hz: 120 dpi: 109 gamma: 1.2 size: 1190x340mm (46.85x13.39")
    diag: 1239mm (48.8") modes: max: 5120x1440 min: 720x400
  Monitor-2: DP-2 mapped: DisplayPort-1 pos: top-right
    model: Gigabyte AORUS AD27QD serial: 19120B001035 built: 2019 res: 1440x2560
    dpi: 103 gamma: 1.2 size: 355x609mm (13.98x23.98") diag: 705mm (27.8")
    ratio: 15:9 modes: max: 2560x1440 min: 720x400
  API: OpenGL v: 4.6 Mesa 23.0.2 renderer: AMD Radeon RX 6900 XT (navi21
    LLVM 15.0.7 DRM 3.49 6.1.25-1-MANJARO) direct-render: Yes
2

You need to unlock all (dangerous) features with this flag in kernel parameters:

amdgpu.ppfeaturemask=0xffffffff

https://wiki.archlinux.org/title/AMDGPU#Overclocking

3

Sorry I didn’t mention it in the post, I did do the

printf 'amdgpu.ppfeaturemask=0x%x\n' "$(($(cat /sys/module/amdgpu/parameters/ppfeaturemask) | 0x4000))"

and placed the value in my grub config files kernel parameters and ran mkconfig again.
CoreCtrl still has limit of 293W.

When trying to edit /sys/class/drm/card0/device/hwmon/hwmon5/power1_cap directly changing the value of 293000000 to 340000000 is met with “invalid argument” error in nano.

4

Probably that’s bug, see 7900 XTX unable to set power1_cap (#2356) · Issues · drm / amd · GitLab

5

I’m reading through it and found this linked in the thread 7900 XTX Default Power Cap lower than on Windows (#2400) · Issues · drm / amd · GitLab

Based on that it might be reporting the right value already? But then after that somebody is reporting unclear values that got later fixed to the appropriate ones. :confused: unsure of how to proceed. I’m on 6.1.25 so shouldn’t the patch mentioned in your thread be applied to the kernel already?

6

Yes it should be applied since kernel 6.1 as you can check in sources

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/gpu/drm/amd/pm/swsmu/smu13?h=linux-6.1.y