From 776cdf6e92c1fcd1839bee8a1bdfeed711aaa8d2 Mon Sep 17 00:00:00 2001
From: Thomas Gebert <thomas.gebert@iternity.com>
Date: Wed, 24 Sep 2025 15:28:30 +0200
Subject: [PATCH] Add MAX CSTATE

---
 cpupower/cpupower    |  1 +
 cpupower/cpupower.sh | 15 ++++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/cpupower/cpupower b/cpupower/cpupower
index d17ec34..2b99100 100644
--- a/cpupower/cpupower
+++ b/cpupower/cpupower
@@ -1,2 +1,3 @@
 CPU_GOVERNOR="performance"
+CPU_CSTATE_MAX="C1"
 CPU_CSTATES_DISABLE_BY_LATENCY="3"
diff --git a/cpupower/cpupower.sh b/cpupower/cpupower.sh
index 4323c8a..7fac44b 100644
--- a/cpupower/cpupower.sh
+++ b/cpupower/cpupower.sh
@@ -26,8 +26,21 @@ else
   echo "CPU governor is not set."
 fi
 
+# Set the Cstate by Max C-State
+if [ ! "${CPU_CSTATE_MAX}" == "" ]; then
+  print_header "Setting CPU CStates to max \"${CPU_CSTATE_MAX}\""
+  CPU_POWER_SET_ACTION="-e"
+  CPU_POWER_CSTATE=0
+  for CPU_CSTATE_NAME in /sys/devices/system/cpu/cpu0/cpuidle/state*/name; do
+    cpupower idle-set "${CPU_POWER_SET_ACTION}" "${CPU_POWER_CSTATE}" &> /dev/null
+    CPU_POWER_CSTATE=$((CPU_POWER_CSTATE+1))
+    if grep -q "\b${CPU_CSTATE_MAX}\b" "${CPU_CSTATE_NAME}"; then
+      CPU_POWER_SET_ACTION="-d"
+    fi
+  done
+  cpupower idle-info
 # Set the Cstate by latency
-if [ ! "${CPU_CSTATES_DISABLE_BY_LATENCY}" == "" ]; then
+elif [ ! "${CPU_CSTATES_DISABLE_BY_LATENCY}" == "" ]; then
   print_header "Setting CPU CStates by latency to ${CPU_CSTATES_DISABLE_BY_LATENCY}"
   cpupower idle-set --disable-by-latency "${CPU_CSTATES_DISABLE_BY_LATENCY}" &> /dev/null
   cpupower idle-info