From d29150307cc19feb2ae61104134ce0ea01549e09 Mon Sep 17 00:00:00 2001
From: Ueda Naoaki <nao.uedder@gmail.com>
Date: Sun, 14 Jan 2024 14:40:57 +0900
Subject: Add cpu-governor service for RPi

Link: https://github.com/coreos/docs/blob/master/os/power-management.md
---
 parts/rpi-cpugovernor.bu | 18 ++++++++++++++++++
 rpi4.bu                  |  1 +
 rpi4.ign                 |  4 ++++
 3 files changed, 23 insertions(+)
 create mode 100644 parts/rpi-cpugovernor.bu

diff --git a/parts/rpi-cpugovernor.bu b/parts/rpi-cpugovernor.bu
new file mode 100644
index 0000000..1348f51
--- /dev/null
+++ b/parts/rpi-cpugovernor.bu
@@ -0,0 +1,18 @@
+variant: fcos
+version: 1.5.0
+systemd:
+  units:
+    - name: cpu-governor.service
+      enable: true
+      contents: |
+        [Unit]
+        Description=Enable CPU power saving
+
+        [Service]
+        Type=oneshot
+        RemainAfterExit=yes
+        ExecStart=/usr/sbin/modprobe cpufreq_conservative
+        ExecStart=/usr/bin/sh -c '/usr/bin/echo "ondemand" | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor'
+
+        [Install]
+        WantedBy=multi-user.target
diff --git a/rpi4.bu b/rpi4.bu
index fee1595..461c8aa 100644
--- a/rpi4.bu
+++ b/rpi4.bu
@@ -6,3 +6,4 @@ ignition:
       - local: parts/users.bu
       - local: parts/timezone.bu
       - local: parts/rpi4-hostname.bu
+      - local: parts/rpi-cpugovernor.bu
diff --git a/rpi4.ign b/rpi4.ign
index e838c8b..1872c45 100644
--- a/rpi4.ign
+++ b/rpi4.ign
@@ -13,6 +13,10 @@
         {
           "compression": "gzip",
           "source": "data:;base64,H4sIAAAAAAAC/yyNTarDMAyE9z7FXODlB/y60G2EqzSCRAqWyPmLS2Y1zPDx3dyVLQlb8yi39FA3wjr9T0uJ9M4foQJsekiMAvzh4twJs2Sbd480PuX3AKe/hbC8an2G5pZi+aAjaoeaEC6tw7mWbwAAAP//HoeGtoMAAAA="
+        },
+        {
+          "compression": "gzip",
+          "source": "data:;base64,H4sIAAAAAAAC/3SQPWvDMBCGd/+KI0ugYKsduhg89CNDt9I0dCglKPLFEdh37t3ZjSE/vjgfTpcOAt0rPTo913uJniyHbWBNehSNTDncZffZbaKDGjZlngB0FE3HDUAK5BvMIbRdWnGPQiyZovQx4PECAJLf1JiDSXeJApMhmeZwOCcAnyuK9jWVz6hBYmuRqVgcX4Cn1xW0/IMC6vtIVXJll6eOV/x9aLFgQt2xTeEbNj7Sw9ZQFvtoxYA6nS32GJbmxQrXqTjdRHINl63wBke7reD3OjCNbt5ij/+RI6g7SAPMpxrDjmHGVGLjqZzBAQwRnA7qShw/ru40Xhfablw37tzSafB1pGp9Ge78j/ULqfm6vlp/eDIsH4ei6WqLaacomXmp0JLfAAAA//8D64rP3AEAAA=="
         }
       ]
     },
-- 
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