| 21 Oct 2025 |
 Luke | Let me check the specs, it's long but within the DisplayPort standard | 20:03:02 |
| Luke | https://www.newegg.com/p/N82E16812399301 | 20:04:05 |
| Luke | It's one of these - I have an adjustable desk and keep my machine on the floor | 20:04:29 |
| Luke | Hence the length | 20:04:37 |
 K900 | I would try a shorter cable before anything else tbh | 20:04:41 |
| Luke | Let me grab the one from the box and report back | 20:05:00 |
| Luke | No dice, DisplayPort cable included with the monitor is also capped at 95Hz | 20:10:48 |
| Luke | Also, if that cable can truly do what is specified then the 8k@60Hz is an equivalent amount of data to 4k@240Hz | 20:13:01 |
| Luke | Shouldn't be a problem | 20:13:09 |
| K900 | Also are you using the AMDGPU DDX or modesetting | 20:19:02 |
| Luke | From inxi:
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Vega 20 [Radeon VII]
driver: amdgpu v: kernel arch: GCN-5 pcie: speed: 8 GT/s lanes: 16 ports:
active: DP-3 empty: DP-1,DP-2,HDMI-A-1 bus-ID: 0c:00.0 chip-ID: 1002:66af
class-ID: 0300
Display: unspecified server: X.org v: 1.21.1.18 driver: X: loaded: amdgpu
dri: radeonsi gpu: amdgpu display-ID: :0 screens: 1
Screen-1: 0 s-res: 3840x2160 s-size: <missing: xdpyinfo>
Monitor-1: DP-3 mapped: DisplayPort-2 model: LG (GoldStar) ULTRAGEAR+
serial: <filter> res: N/A dpi: 140 size: 697x392mm (27.44x15.43")
diag: 800mm (31.5") modes: max: 3840x2160 min: 640x480
API: EGL v: 1.5 hw: drv: amd radeonsi platforms: device: 0 drv: radeonsi
device: 1 drv: swrast gbm: drv: kms_swrast surfaceless: drv: radeonsi x11:
drv: radeonsi inactive: wayland
API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 25.2.4 glx-v: 1.4
direct-render: yes renderer: AMD Radeon VII (radeonsi vega20 ACO DRM 3.61
6.12.51) device-ID: 1002:66af
Info: Tools: api: clinfo, eglinfo, glxinfo x11: xprop,xrandr
| 20:21:40 |
| Luke | uhhhhh | 20:21:54 |
| Luke | amdgpu? | 20:22:01 |
| Luke | I think? | 20:22:04 |
| K900 | Do you have services.xserver.videoDrivers set to anything? | 20:22:29 |
| Luke | Yeah:
xserver = {
enable = true;
xkb.layout = "us";
videoDrivers = [
"amdgpu"
"radeonsi"
];
displayManager.startx = {
enable = true;
};
desktopManager = {
xterm.enable = false;
};
windowManager.bspwm.enable = true;
};
| 20:23:02 |
| K900 | Delete this | 20:23:13 |
| K900 | Just entirely | 20:23:17 |
| K900 | Then rebuild and reboot | 20:23:21 |
| Luke | I am running bspwm with a userspace config | 20:23:49 |
| Luke | Deleting this and rebuilding will remove my desktop environment? | 20:24:06 |
| K900 | No, delete videoDrivers | 20:24:13 |
| K900 | Keep everything else | 20:24:15 |
| Luke | Ah gotcha | 20:24:19 |
| Luke | Will do and report back | 20:24:27 |
| Luke | K900: any concern about these excerpts?
hardware.graphics = {
enable = true;
enable32Bit = true;
extraPackages = with pkgs; [
rocmPackages.clr.icd
rocmPackages.clr
rocmPackages.rocminfo
rocmPackages.rocm-runtime
];
};
boot.initrd.availableKernelModules = [
"nvme"
"xhci_pci"
"ahci"
"usbhid"
"usb_storage"
"sd_mod"
];
boot.initrd.kernelModules = [ "amdgpu" ];
boot.kernelModules = [ "radeonsi" ];
| 20:26:30 |
| K900 | Remove boot.kernelModules = ["radeonsi"] | 20:26:59 |
| K900 | It's unised | 20:27:01 |
| K900 | * It's unused | 20:27:03 |
| K900 | You may want to also remove rocm stuff because I don't think that even supports Vega anymore | 20:27:13 |
