diff --git a/app/igneum-app/src/engine.rs b/app/igneum-app/src/engine.rs
index 096eec0c2..6a8e28bec 100644
--- a/app/igneum-app/src/engine.rs
+++ b/app/igneum-app/src/engine.rs
@@ -123,7 +123,7 @@ impl Shared {
         st.mining.accepted_total = settings.accepted_total;
         st.mining.fee_total = settings.fee_total;
         st.address = address_state(&settings, &wallet_path);
-        st.settings = crate::state::SettingsState { identities: settings.identities, vote: settings.vote, start_at_login: crate::platform::start_at_login_is_on(), auto_update: settings.auto_update, remote_jobs: settings.remote_jobs, prove: settings.prove, sweep: settings.sweep, power_control: settings.power_control, power_note: String::new(), tuning_off: false, tuning_note: String::new(), tune_goal: settings.tune_goal.clone(), power_price_pence: settings.power_price_pence, tune_climb: settings.tune_climb, dev_fee: settings.dev_fee, proof_verify_trust: settings.proof_verify_trust };
+        st.settings = crate::state::SettingsState { identities: settings.identities, vote: settings.vote, start_at_login: crate::platform::start_at_login_is_on(), auto_update: settings.auto_update, remote_jobs: settings.remote_jobs, prove: settings.prove, sweep: settings.sweep, power_control: settings.power_control, power_note: String::new(), tuning_off: false, tuning_note: String::new(), tune_goal: settings.tune_goal.clone(), power_price_pence: settings.power_price_pence, tune_climb: settings.tune_climb, tune_period_s: crate::ember::PERIOD_S, dev_fee: settings.dev_fee, proof_verify_trust: settings.proof_verify_trust };
         st.dev_fee = crate::state::DevFeeState { on: settings.dev_fee, percent: if settings.dev_fee { 1 } else { 0 }, address: String::new(), line: String::new() };
         st.live_page = packaged.live_page.clone();
         st.finality.message = "waiting for the miner".into();
@@ -2176,6 +2176,7 @@ impl Engine {
             let mut st = self.st();
             st.settings.tuning_off = !ember.enabled;
             st.settings.tuning_note = if ember.enabled { String::new() } else { "tuning paused fleet-wide by the signed manifest".into() };
+            st.settings.tune_period_s = ember.period_s;
         }
         if paused || !ember.enabled {
             return;
diff --git a/app/igneum-app/src/state.rs b/app/igneum-app/src/state.rs
index cf0ccd395..90ef51fd3 100644
--- a/app/igneum-app/src/state.rs
+++ b/app/igneum-app/src/state.rs
@@ -297,6 +297,9 @@ pub struct SettingsState {
     pub tune_goal: String,
     pub power_price_pence: f64,
     pub tune_climb: bool,
+    /// the manifest's tune period in seconds (tuning.ember.period_s, default 7 days): a card is due again at
+    /// sweep_at + tune_period_s, or at once after a driver major or program-class change
+    pub tune_period_s: u64,
     /// the miner software's dev fee switch (settings; `--dev-fee 0` when off)
     pub dev_fee: bool,
     /// devnet only: the node trusts proof records without a verifier (`IGNEUM_PROOF_VERIFY=trust`)