Hardware/Razer: Difference between revisions

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 https://superuser.com/questions/1707773/how-to-turn-usb-connected-device-on-and-off-in-linux
+If that does not work, you can reset all usb controllers instead:
+https://unix.stackexchange.com/questions/704341/how-to-reset-usb-controllers<syntaxhighlight lang="nixos" line="1">
+  # Razer usb reset. Since it disables somehow on boot.
+  systemd.services."usb-reset" = {
+    description = "Resets usb port for my Razer Keyboard";
+    after = ["multi-user.target"];
+    serviceConfig = {
+        User = "root";
+        Type = "simple";
+        ExecStart=pkgs.writeShellScript "unit-restart-usb-controller" ''
+          #!/usr/bin/env bash
+          # Resets all USB host controllers of the system.
+          # This is useful in case one stopped working
+          # due to a faulty device having been connected to it.
+          base="/sys/bus/pci/drivers"
+          sleep_secs="1"
+          # This might find a sub-set of these:
+          # * 'ohci_hcd' - USB 3.0
+          # * 'ehci-pci' - USB 2.0
+          # * 'xhci_hcd' - USB 3.0
+          echo "Looking for USB standards ..."
+          for usb_std in "$base/"?hci[-_]?c*
+          do
+              echo "* USB standard '$usb_std' ..."
+              for dev_path in "$usb_std/"*:*
+              do
+                  dev="$(basename "$dev_path")"
+                  echo "  - Resetting device '$dev' ..."
+                  printf '%s' "$dev" | sudo tee "$usb_std/unbind" > /dev/null
+                  sleep "$sleep_secs"
+                  printf '%s' "$dev" | sudo tee "$usb_std/bind" > /dev/null
+                  echo "    done."
+              done
+              echo "  done."
+          done
+          echo "done."
+        '';
+        KillMode = "process";
+        Restart = "on-failure";
+    };
+    wantedBy = ["graphical.target"];
+  };
+  systemd.services."usb-reset".enable = true;
+</syntaxhighlight>