Rebase to flake parts #2

.gitignore

@@ -0,0 +1 @@
+_untracked/

modules/hosts/t2mbp/configuration.nix

@@ -49,7 +49,7 @@
         # Upstream averages 50 samples (~5s); peak tracks spikes so fans hit sysfs max sooner
         # under bursty browser/GPU load (see patches/t2fanrd-use-peak-temperature.patch).
         package = inputs.t2fanrd.packages.x86_64-linux.default.overrideAttrs (old: {
-          patches = (old.patches or [ ]) ++ [ ../../../patches/t2fanrd-use-peak-temperature.patch ];
+          patches = (old.patches or [ ]) ++ [ ../../../patches/t2fanrd-use-peak-temperature.patch ]; #TODO[epic=Moderate] Move patch file to host's directory.
         });
         config = {
           Fan1 = {

patches/t2fanrd-use-peak-temperature.patch

@@ -0,0 +1,27 @@
+--- a/src/main.rs
++++ b/src/main.rs
+@@ -174,19 +174,20 @@ fn start_temp_loop(
+             }
+         }
+ 
+-        let sum_temp: u16 = temps.iter().map(|t| *t as u16).sum();
+-        let mean_temp = sum_temp / (temps.len() as u16);
+-        if mean_temp == last_temp {
++        // Max over the rolling window tracks spikes; the upstream mean can lag several
++        // seconds behind bursty GPU/CPU load.
++        let control_temp = temps.iter().copied().max().expect("non-empty after push_back");
++        if control_temp == last_temp {
+             std::thread::sleep(std::time::Duration::from_secs(1));
+             was_long_sleep = true;
+         } else {
+-            last_temp = mean_temp;
++            last_temp = control_temp;
+             for fan in fans {
+-                fan.set_speed(fan.calc_speed(mean_temp as u8))?;
++                fan.set_speed(fan.calc_speed(control_temp))?;
+             }
+ 
+             std::thread::sleep(std::time::Duration::from_millis(100));
+             was_long_sleep = false;
+         }
+     }