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From 6e4cd276213a20bc55146588b0ec2fc6b622a9d7 Mon Sep 17 00:00:00 2001
From: ProBackup-nl <515451+ProBackup-nl@users.noreply.github.com>
Date: Thu, 18 Mar 2021 18:21:43 +0100
Subject: [PATCH] Make rpi poe fan less noisy in cool environments
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Run the PoE hat fan with reduced noise when possible. The PoE hat fan will spin even at PWM=1 and spins almost silent. Tested at 17ºC, the fan PWM alternates between 1 and 10, which is a lot less noisy then alternating between PWM levels 0 and 31.
---
arch/arm/boot/dts/overlays/rpi-poe-overlay.dts | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
+++ b/arch/arm/boot/dts/overlays/rpi-poe-overlay.dts
@@ -16,7 +16,7 @@
cooling-min-state = <0>;
cooling-max-state = <4>;
#cooling-cells = <2>;
- cooling-levels = <0 31 63 150 255>;
+ cooling-levels = <0 1 10 100 255>;
status = "okay";
};
};
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