Release Vulpes OS 2.7-preview.24

tundra/runtime/enable-cpuidle.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: MPL-2.0
+"""Enable the Sargo Qualcomm low-power states when the kernel exposes them."""
+from pathlib import Path
+import time
+
+
+PARAMETER = Path('/sys/module/lpm_levels/parameters/sleep_disabled')
+
+
+def main():
+    deadline = time.monotonic() + 8
+    while time.monotonic() < deadline and not PARAMETER.exists():
+        time.sleep(.1)
+    if not PARAMETER.exists():
+        print('Qualcomm lpm_levels parameter unavailable; leaving kernel defaults')
+        return
+    current = PARAMETER.read_text().strip()
+    if current == 'N':
+        print('Qualcomm low-power states are already enabled')
+        return
+    if current != 'Y':
+        print('Unknown sleep_disabled value; leaving kernel setting unchanged:', current)
+        return
+    PARAMETER.write_text('N')
+    if PARAMETER.read_text().strip() != 'N':
+        raise RuntimeError('Could not enable Qualcomm CPU low-power states')
+    print('Enabled Qualcomm CPU low-power states')
+
+
+if __name__ == '__main__':
+    main()