Управление вентилятором Radeon RX-6xx0

Вдохновлённый решением одного немца, сваял собственный сильно упрощённый вариант.

Понадобится создать два файла.

1. Собственно скрипт запуска /usr/local/sbin/amdgpufan:

   #!/bin/bash
   # amdgpufan
   
   [ $UID -eq 0 ] || { # Check root privileges.
       echo "Writing to /sys requires root privileges."
       exit 1
   }
   
   ###########################
   ## Maintained variables: ##
   card=0
   rate=5
   min_tmp=40
   
   ###########################
   ## Calculated variables: ##
   sys_dir=`ls -d /sys/class/drm/card$card/device/hwmon/*`
   ## temp# - 1:edge, 2:junction, 3:memory
   sys_tmp=${sys_dir}/temp2_input
   sys_pwm=${sys_dir}/pwm1
   sys_fan=${sys_pwm}_enable
   
   cur_tmp=$[`cat $sys_tmp`/1000]
   max_tmp=$[`cat ${sys_dir}/temp*_crit | sort -V | head -1`/1000]
   gap_tmp=$[min_tmp/2]
   
   cur_pwm=`cat ${sys_pwm}`
   min_pwm=`cat ${sys_pwm}_min`
   max_pwm=`cat ${sys_pwm}_max`
   ###########################
   
   reset(){
       printf "Exiting and setting fan mode"
       fanmode auto
       exit 0
   }
   
   fanmode(){
       case $1 in
           manual) mode=1;;
           auto)   mode=2;;
           *)      mode=0 # max
       esac
       echo " to '$1'."
       echo $mode >$sys_fan
   }
   
   main(){
       cur_pwm=`cat $sys_pwm`
       cur_tmp=$[`cat $sys_tmp`/1000]
       [[ `cat $sys_fan` -eq 1 ]] || {
           printf "Wrong fan mode, setting"
           fanmode manual
       }
       if  [[ $cur_tmp -gt $max_tmp ]]; then
           echo "$cur_tmp°C above critical, setting PWM to $max_pwm for max speed."
           new_pwm=$max_pwm
       else
           [[ $cur_tmp -le $min_tmp ]] && new_pwm=$min_pwm || {
               for n in `seq 0 4`; do
                   case $n in
                       0) add=70;;
                       1) add=90;;
                       2) add=140;;
                       3) add=210;;
                   esac
                   [[ $cur_tmp -gt $[min_tmp+gap_tmp*n - 1] ]] &&
                   [[ $cur_tmp -le $[min_tmp+gap_tmp*(n+1)] ]] && {
                       new_pwm=$[min_pwm+add]
                       break
                   }
               done
           }
       fi
       printf "%3d°C @%3d PWM" $cur_tmp $cur_pwm
       [[ $cur_pwm -ge $[new_pwm-2] ]] &&
       [[ $cur_pwm -le  $new_pwm    ]] &&
       echo "." || { ## Change PWM if differ.
           printf ", changing to %3d.\n" $new_pwm
           echo $new_pwm >$sys_pwm
       }
   }
       
   trap "reset" SIGINT SIGTERM # Handle signals.
       
   while :; do # run daemon
       main
       sleep ${rate}s
   done
   

2. Запускающий его юнит /lib/systemd/system/amdgpufan.service:

   [Unit]
   Description = AMD GPU fan control
   
   [Service]
   ExecStart = /usr/local/sbin/amdgpufan
   Restart = on-failure
   RestartSec = 5
   
   [Install]
   WantedBy = default.target
   

Пример его работы:

Вечер: веб-сёрфинг, редактирование и пр. Колебания Т°C при PWM 69
 54°C @ 69 PWM.
...Запуск игры.
 60°C @ 69 PWM, changing to  90.
 59°C @ 89 PWM, changing to  70.
 60°C @ 69 PWM, changing to  90.
 57°C @ 89 PWM, changing to  70.
 54°C @ 69 PWM.
 59°C @ 69 PWM.
 62°C @ 69 PWM, changing to  90.
 77°C @ 89 PWM.
...Активная фаза игры.
 82°C @ 89 PWM, changing to 140.
 62°C @138 PWM, changing to  90.
 59°C @ 89 PWM, changing to  70.
 62°C @ 69 PWM, changing to  90.
 60°C @ 89 PWM.
...
 61°C @ 89 PWM.
 62°C @ 89 PWM.
 58°C @ 89 PWM, changing to  70.
 60°C @ 69 PWM, changing to  90.
 75°C @ 89 PWM.
...Игра завершена, плавное падение температуры.
 53°C @ 89 PWM, changing to  70.
 52°C @ 69 PWM.
 40°C @ 69 PWM.
 39°C @ 69 PWM, changing to   0.
 40°C @  0 PWM, changing to  70.
 39°C @ 69 PWM, changing to   0.
 39°C @  0 PWM.
...Ночь: колебания 35-38°C с отключёнными вентиляторами видюхи.
...Утро: вход в систему, веб-сёрфинг, редактирование и пр.
 40°C @  0 PWM, changing to  70.
 41°C @ 69 PWM.
...Колебания 42-55°C