Make rpi poe fan less noisy in cool environments #4222
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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.
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For me, with the default thresholds that causes the fan to spin permanently, but near silently. With a light load it speeds up slightly. The jump is now more pronounced, but most of the time one won't hit it. Any comments, @ghollingworth ? |
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Ah this is PoE fan... not case fan... For the case fan, we only toggle on/off at a relatively high temperature (80 degrees by default) since it would otherwise be on when it's not required... |
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@XECDesign is happy to give this new curve a try. There was some concern about older, dusty fans taking a bit more drive to get started, but in that case the temperature would rise and one of the higher levels would kick in. |
popcornmix
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kernel: Make rpi poe fan less noisy in cool environments See: raspberrypi/linux#4222 kernel: overlays: Add pcie-32bit-dma overlay See: raspberrypi/linux#4216 kernel: ARM: dts: bcm2711: Add aliases for additional SPIs kernel: Revert i2c: bcm2835: Handle untimely DONE signal See: Hexxeh/rpi-firmware#261
popcornmix
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Mar 23, 2021
kernel: Make rpi poe fan less noisy in cool environments See: raspberrypi/linux#4222 kernel: overlays: Add pcie-32bit-dma overlay See: raspberrypi/linux#4216 kernel: ARM: dts: bcm2711: Add aliases for additional SPIs kernel: Revert i2c: bcm2835: Handle untimely DONE signal See: #261
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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.