Intel Killer AX1675x very poor performance

Hello community,

I have a PC in my office with an Intel AX1675x Wireless Adapter and get very poor performance. According to a speedtest ping is 70ms, download-rate about 500kbps and upload arount 40mbits. The upload is oddly fine for 100/60 internet access.

I have a fresh installation of NixOS unstable with gnome and added these options:
hardware.enableAllFirmware = true;
hardware.enableRedistributableFirmware = true;
boot.extraModprobeConfig = ‘’ options iwlwifi disable_ax11=1 ‘’;
boot.kernelPackages = pkgs.linuxPckages_latest;
environment.systemPackages = with pkgs; [ linux-firmware ];

But nothing helps. Any clue how to fix this?

Thanks!

Did you try with a different OS?