Fix SMT toggle always reenabling (fix #73)

backend/src/settings/mod.rs

@@ -23,7 +23,7 @@ pub use traits::{OnResume, OnSet, SettingsRange, TGeneral, TGpu, TCpus, TBattery
 mod tests {
     #[test]
     fn system_defaults_test() {
-        let settings = super::Settings::system_default("idc".into());
+        let settings = super::Settings::system_default("idc".into(), "Cool name".into());
         println!("Loaded system settings: {:?}", settings);
     }
 }

backend/src/settings/steam_deck/cpu.rs

@@ -176,6 +176,7 @@ impl TCpus for Cpus {
     }
 
     fn smt(&mut self) -> &'_ mut bool {
+        log::debug!("CPU driver thinks SMT is {}", self.smt);
         &mut self.smt
     }
 

backend/src/settings/util.rs

@@ -5,3 +5,45 @@ pub fn guess_smt(cpus: &Vec<crate::persist::CpuJson>) -> bool {
     }
     guess
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    use crate::persist::CpuJson;
+
+    #[test]
+    fn smt_guess_test() {
+        let input = vec![
+            cpu_with_online(true),
+            cpu_with_online(true),
+            cpu_with_online(true),
+            cpu_with_online(true),
+            cpu_with_online(true),
+            cpu_with_online(true),
+            cpu_with_online(true),
+            cpu_with_online(true),
+        ];
+        assert_eq!(guess_smt(&input), true);
+
+        let input = vec![
+            cpu_with_online(true),
+            cpu_with_online(false),
+            cpu_with_online(true),
+            cpu_with_online(false),
+            cpu_with_online(true),
+            cpu_with_online(false),
+            cpu_with_online(true),
+            cpu_with_online(false),
+        ];
+        assert_eq!(guess_smt(&input), false);
+    }
+
+    fn cpu_with_online(status: bool) -> CpuJson {
+        CpuJson {
+            online: status,
+            clock_limits: None,
+            governor: "schedutil".to_owned(),
+        }
+    }
+}

src/backend.ts

@@ -146,7 +146,7 @@ export async function setCpuSmt(status: boolean): Promise<boolean[]> {
 }
 
 export async function getCpuSmt(): Promise<boolean> {
-    return await call_backend("CPU_get_smt", []);
+    return (await call_backend("CPU_get_smt", []))[0];
 }
 
 /*export async function getCpuCount(): Promise<number> {