从 Ubuntu 暂停恢复后如何配置 cpu 频率？

问题：

在 Ubuntu 16.04 中，我运行我的 shell 脚本来将我的 cpu 频率缩减为 1600000，并且它的调控器是“用户空间”：

sudo /home/t/program_files/hardware/cpu/cpuFreq/changeCpuFreq.sh 1600000

分别写入 1600000 和“用户空间/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed” /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor。

但是，在我的Ubuntu挂起然后唤醒后，cpu频率又回到了2667000，因为/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed被一些未知的程序重写为2667000。我希望从挂起恢复后cpu频率保持在1600000。

暂定解决方案：

我尝试了https://superuser.com/a/733336/9265（见下文）的一种解决方案，并添加了一个文件/etc/pm/sleep.d/20_cpu_freq，其内容为：

#!/bin/sh
# upon resume from suspension, scale down the cpu freq
case "$1" in
   thaw|resume)
     /home/t/program_files/hardware/cpu/cpuFreq/changeCpuFreq.sh 1600000
     ;;
esac

并使其可执行chmod a+x *，使其权限为-rwxrwxr-x. 但它不会在从暂停中恢复后将 cpu 频率降低到 1600000。

是/etc/pm/sleep.d/20_cpu_freq从暂停中恢复时实际运行的吗？我该如何验证呢？

是否/etc/pm/sleep.d/20_cpu_freq被其他配置文件覆盖？

没有其他脚本/etc/pm/sleep.d/可以处理 CPU 频率。

有一个系统默认脚本/usr/lib/pm-utils/sleep.d/94cpufreq，它处理 CPU 频率（其内容见下文）。有人知道脚本的作用吗？它是覆盖还是被覆盖/etc/pm/sleep.d/20_cpu_freq？（请注意，如果我重命名/etc/pm/sleep.d/20_cpu_freq为 /etc/pm/sleep.d/95cpufreqor /etc/pm/sleep.d/93cpufreq，为了更改它和 之间的顺序/usr/lib/pm-utils/sleep.d/94cpufreq，`两者仍然不会在暂停恢复后将 cpu 频率缩减到 1600000。）

在中，如果我在 case之后/usr/lib/pm-utils/sleep.d/94cpufreq添加，它也不起作用。/home/t/program_files/hardware/cpu/cpuFreq/changeCpuFreq.sh 1600000thaw_cpufreqresume|thaw)

/home/t/program_files/hardware/cpu/cpuFreq/changeCpuFreq.sh 1600000如果不在，我应该跑到哪里去/etc/pm/sleep.d/20_cpu_freq？

内容/usr/lib/pm-utils/sleep.d/94cpufreq

#!/bin/sh                                                                                                                                                                          
# Ensure cpu governor is set to something sane.                                                                                                                                    
# TODO: Which of the cpu governors is still insane?  File bugs against                                                                                                             
#       those that are.                                                                                                                                                            

. "${PM_FUNCTIONS}"

[ -d /sys/devices/system/cpu/ ] || exit $NA

hibernate_cpufreq()
{
  ( cd /sys/devices/system/cpu/
  for x in cpu[0-9]*; do
    # if cpufreq is a symlink, it is handled by another cpu. Skip.                                                                                                                 
    [ -L "$x/cpufreq" ] && continue
    gov="$x/cpufreq/scaling_governor"
    # if we do not have a scaling_governor file, skip.                                                                                                                             
    [ -f "$gov" ] || continue
    # if our temporary governor is not available, skip.                                                                                                                            
    grep -q "$TEMPORARY_CPUFREQ_GOVERNOR" \
            "$x/cpufreq/scaling_available_governors" || continue
    savestate "${x}_governor" < "$gov"
    echo "$TEMPORARY_CPUFREQ_GOVERNOR" > "$gov"
  done )
}

thaw_cpufreq()
{
  ( cd /sys/devices/system/cpu/
  for x in cpu[0-9]*/cpufreq/scaling_governor ; do
    [ -f "$x" ] || continue
    state_exists "${x%%/*}_governor" || continue
    restorestate "${x%%/*}_governor" > "$x"
  done )
}

case "$1" in
  suspend|hibernate)
    hibernate_cpufreq
    ;;
  resume|thaw)
    thaw_cpufreq
    ;;
  *) exit $NA
    ;;
esac

复制自https://superuser.com/a/733336/9265

从手册页pm-action(8)：

/etc/pm/sleep.d, /usr/lib/pm-utils/sleep.d
     Programs in these directories (called hooks) are combined
     and executed in C sort order before suspend and hibernate
     with as argument ´suspend´ or ´hibernate´. Afterwards they
     are called in reverse order with argument ´resume´ and
     ´thaw´ respectively. **If both directories contain a similar
     named file, the one in /etc/pm/sleep.d will get preference.**
     It is possible to disable a hook in the distribution
     directory by putting a non-executable file in
     /etc/pm/sleep.d, or by adding it to the HOOK_BLACKLIST
     configuration variable.

因此，您可以简单地放置一个这样的 shell 脚本：

#!/bin/bash

case "$1" in
suspend|hibernate)
    actions to
    take
    on suspend
    or hibernate
    ;;
resume|thaw)
    other actions
    to trigger
    on resume
    ;;
esac

进入例如99-myhooks.sh并使其可执行。

Enter~.Enter顺便说一句，您可以通过进入SSH 会话来终止陈旧的 SSH 连接 。