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howtos:hp_and_cpu_fan_constantly_on_after_resume

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howtos:hp_and_cpu_fan_constantly_on_after_resume [d/m/Y H:i] (current)
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 +Reference from: https://​bugs.launchpad.net/​ubuntu/​+source/​linux/​+bug/​77370
  
 +/​etc/​pm/​sleep.d/​cpu-fan:​
 +
 +<​file>​
 +#!/bin/sh
 +
 +case $1 in
 +     ​suspend|suspend_hybrid|hibernate)
 +        ;;
 +     ​resume|thaw)
 +        # No need to do anything here, kernel unsuspends USB devices
 +        echo -n "​1"​ > /​sys/​devices/​virtual/​thermal/​cooling_device11/​cur_state
 +        sleep 10
 +        echo -n "​0"​ > /​sys/​devices/​virtual/​thermal/​cooling_device11/​cur_state
 +        ;;
 +esac
 +
 +
 +
 +
 +
 +
 +</​file>​
 +
 +or
 +
 +/​etc/​pm/​sleep.d/​99fancontrol.sh
 +
 +<​file>​
 +#!/bin/sh
 +#
 +# https://​bugs.launchpad.net/​ubuntu/​+source/​linux-source-2.6.17/​+bug/​77370
 +# file /​etc/​pm/​sleep.d/​99fancontrol.sh
 +
 +case "​$1"​ in
 + ​hibernate|suspend)
 +  # Stopping is not required.
 +  ;;
 + ​thaw|resume)
 +  echo -n "​1"​ > /​sys/​devices/​virtual/​thermal/​cooling_device11/​cur_state
 +  ;;
 + *) exit $NA
 +  ;;
 +esac
 +</​file>​
 +
 +This will work on Ubuntu 13.04 Raring Ringtail:
 +<​code>​
 +touch /​etc/​pm/​sleep.d/​99fancontrol.sh
 +chmod +x /​etc/​pm/​sleep.d/​99fancontrol.sh
 +
 +cat > /​etc/​pm/​sleep.d/​99fancontrol.sh
 +</​code>​
 +<​file>​
 +#!/bin/sh
 +#
 +# https://​bugs.launchpad.net/​ubuntu/​+source/​linux-source-2.6.17/​+bug/​77370
 +# file /​etc/​pm/​sleep.d/​99fancontrol.sh
 +
 +case "​$1"​ in
 +    hibernate|suspend)
 +    # Stopping is not required.
 +    ;;
 +
 +    thaw|resume)
 +    # In background.
 +    ls /​sys/​devices/​virtual/​thermal/​cooling_device*/​cur_state | while read A; do echo 1 > $A; echo 0 > $A; done
 +    ;;
 +
 +    *) exit $NA
 +    ;;
 +esac
 +</​file>​
 +
 +Note from the bug:
 +
 +//"pd (petr-danecek) wrote on 2013-04-06: #94
 +
 +I can also confirm that the above solves the problem. Apparently the kernel does not know what state are the fans in. 
 +This can be solved by turning them on and off for a brief period of time. Note that this does not turn the fans off permanently,​ the cooling is not affected and the fans continue to work normally. (Well, at least on my laptop.)
 +"//
howtos/hp_and_cpu_fan_constantly_on_after_resume.txt · Last modified: d/m/Y H:i (external edit)