diff --git a/bert/configuration.nix b/bert/configuration.nix
index 2e30685..1e4be01 100644
--- a/bert/configuration.nix
+++ b/bert/configuration.nix
@@ -74,6 +74,14 @@
   services.openssh.settings.PasswordAuthentication = false;
   users.users.root.openssh.authorizedKeys.keys = [''ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEhPyyqS3BGYor3zLbjc8hZuhem3mS8TNmvWogXcnz/b chandler@chandlerswift.com'' ];
 
+  users.users.kathe = {
+    isNormalUser = true;
+    description = "Käthe Swift";
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIMJFkFEKuT9v9B9ynAf5QfLZF54jWhzEnQIeW2kQWKJ+"
+    ];
+  };
+
   users.users.isaac = {
     isNormalUser = true;
     description = "Isaac Swift";
diff --git a/oscar/hardware-configuration.nix b/oscar/hardware-configuration.nix
index ed7c834..a950bd3 100644
--- a/oscar/hardware-configuration.nix
+++ b/oscar/hardware-configuration.nix
@@ -11,7 +11,20 @@
   boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "thunderbolt" "usb_storage" "sd_mod" ];
   boot.initrd.kernelModules = [ ];
   boot.kernelModules = [ "kvm-amd" ];
-  boot.kernelPackages = pkgs.linuxPackages_latest;
+  # It's been a busy month with dock issues! Two specific kernel constraints:
+  # 1. We're, for the moment, stuck on the LTS kernel because kernels >6.15.?
+  #    break wired networking on the dock. This has been reported in Fedora
+  #    fora:
+  #    https://discussion.fedoraproject.org/t/fedora-42-driver-issues-with-kernel-6-15-thunderbolt-docking-station-igb-usb/157039
+  # 2. "drm/dp: Change AUX DPCD probe address from DPCD_REV to LANE0_1_STATUS"
+  #    (included in 6.12.44, so we're pinned to one release earlier) breaks
+  #    external DisplayPort displays on the Thunderbolt Dock. Issue tracker:
+  #    https://gitlab.freedesktop.org/drm/amd/-/issues/4500
+  #    A patch has been developed as of 2025-09-03, but no fix yet. Also
+  #    believed to be broken in 6.16.0 and newer.
+  #    via https://discuss.cachyos.org/t/thunderbolt-dock-dp-displays-no-longer-working/14695/2
+  boot.kernelPackages = (import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/b98378bf28d97644078e1c56d10dc7819d643cbf~.tar.gz") {}).linuxPackages; # before 6.12.44 upgrade
+
   boot.extraModulePackages = [ ];
 
   fileSystems."/" =