diff --git a/lib/provision.sh b/lib/provision.sh
index 93fd71e..307a613 100644
--- a/lib/provision.sh
+++ b/lib/provision.sh
@@ -242,6 +242,9 @@ provision_install_wifi_helper() {
         log_warning "Couldn't set up the kiosk WiFi screen's permission - Ctrl+Alt+Super+W won't be able to connect"
     fi
     rm -f "$tmp"
+    # Flaky cheap dongles (RTL8188CUS...) need WiFi power saving off.
+    provision_install_file "etc/udev/rules.d/70-kiosk-wifi-power.rules" /etc/udev/rules.d/70-kiosk-wifi-power.rules
+    sudo udevadm control --reload-rules 2>/dev/null || true
 }
 
 provision_configure_firewall() {
diff --git a/provision/files/etc/udev/rules.d/70-kiosk-wifi-power.rules b/provision/files/etc/udev/rules.d/70-kiosk-wifi-power.rules
new file mode 100644
index 0000000..4064080
--- /dev/null
+++ b/provision/files/etc/udev/rules.d/70-kiosk-wifi-power.rules
@@ -0,0 +1,11 @@
+# Keep WiFi adapters awake. Power saving (the adapter dozing between
+# packets, and the USB port suspending an idle dongle) is what makes
+# cheap dongles like the Realtek RTL8188CUS drop or stall a connection.
+# Both are ordinary software settings, so nothing here can harm the
+# hardware: the cost is a fraction of a watt.
+
+# Radio power save off on every WiFi interface as it appears.
+ACTION=="add", SUBSYSTEM=="net", KERNEL=="wl*", RUN+="/usr/sbin/iw dev $name set power_save off"
+
+# No USB autosuspend for the common RTL8188/8192 CU/CUS/RU dongles.
+ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="0bda", ATTR{idProduct}=="8176|8177|8178|8179|817a|817b|817c|817d|817e|8191", TEST=="power/control", ATTR{power/control}="on"