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Bash 脚本redirect-brightness

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Bash 脚本redirect-brightness

操作系统：Ubuntu-18.04 LTS

/sys/class/backlight/我在目录中有 2 个符号链接。

acpi_video0 -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0/
nv_backlight -> ../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-LVDS-1/nv_backlight/

亮度热键可改变 的值acpi_video0/brightness。但这实际上并没有改变显示器的亮度。

但是，手动改变值nv_backlight/brightness实际上会改变显示器的亮度。

因此，将热键链接到nv_backlight而不是acpi_video0将解决我的问题，但我不知道如何做到这一点。

编辑：使用 Fn 键调整亮度（热键）时，屏幕上会出现弹出式滑块进度条。

编辑：

  1. 输入：

    cat /sys/class/backlight/nv_backlight/max_brightness

    输出：

    100

  2. 输入：

    cat /sys/class/backlight/nv_backlight/actual_brightness

    输出（这个值自动变为相同的值，我手动给出了/sys/class/backlight/nv_backlight/brightness）：

    10

  3. 输入：

    cat /sys/class/backlight/acpi_video0/max_brightness

    输出：

    15

答案1

Bash 脚本redirect-brightness

你的问题是增加/减少亮度的功能键正在更新，/sys/class/backlight/acpi_video0/brightness而不是/sys/class/backlight/nv_backlight/brightness

最初的请求是拦截功能键并使用它们来控制nv_backlight驱动程序。这样做的问题是：

  • 棘手的udev脚本
  • 无需复杂的 Python 脚本，无需弹出通知滑块显示亮度。

解决方案是使用inotify来监视 的变化acpi_video0。然后计算亮度百分比并将该百分比应用于nv_backlight。

在下面的 bash 脚本中您需要设置：

WatchDriver="/sys/class/backlight/acpi_video0/brightness"
PatchDriver="/sys/class/backlight/nv_backlight/brightness"

放置脚本/usr/local/bin并使用以下命令使其可执行：

chmod a+x /usr/local/bin/redirect-brightness

首先使用命令行运行脚本

redirect-brightness -l

如果出现问题，请使用以下命令检查日志文件：

cat /tmp/redirect-brightness.log

如果一切顺利，请将其添加redirect-brightness到您的启动应用程序中。

redirect-brightnessbash 脚本

#!/bin/bash

# NAME: redirect-brightness
# PATH: /usr/local/bin
# DESC: Redirect to correct driver when Ubuntu is adjusting the wrong
#       /sys/class/DRIVER_NAME/brightness

# DATE: June 13, 2018. Modified June 14, 2018.

# NOTE: Written for Ubuntu question:
#       https://askubuntu.com/q/1045624/307523

WatchDriver="/sys/class/backlight/intel_backlight"
PatchDriver="/sys/class/backlight/intel_backlight"

# Must be running as sudo
if [[ $(id -u) != 0 ]]; then
    echo >&2 "Root access required. Use: 'sudo redirect-brightness'"
    exit 1
fi

# inotifywait required
type inotifywait >/dev/null 2>&1 || \
    { echo >&2 "'inotifywait' required but it's not installed.  Aborting."; \
      echo >&2 "Use 'sudo apt install inotify-tools' to install it.'"; \
      exit 1; }

# Was right watch driver directory name setup correctly?
if [[ ! -d $WatchDriver ]]; then
    echo >&2 "Watch directory: '$WatchDriver'"; \
    echo >&2 "does not exist. Did you spell it correctly? Aborting.'"; \
    exit 1;
fi

# Was right patch driver directory name setup correctly?
if [[ ! -d $PatchDriver ]]; then
    echo >&2 "Redirect to directory: '$PatchDriver'"; \
    echo >&2 "does not exist. Did you spell it correctly? Aborting.'"; \
    exit 1;
fi

# Get maximum brightness values
WatchMax=$(cat $WatchDriver/max_brightness)
PatchMax=$(cat $PatchDriver/max_brightness)

# PARM: 1="-l" or "--log-file" then write each step to log file.
fLogFile=false
if [[ $1 == "-l" ]] || [[ $1 == "--log-file" ]]; then
    fLogFile=true
    LogFile=/tmp/redirect-brightness.log
    echo redirect-brightness LOG FILE > $LogFile
    echo WatchMax: $WatchMax PatchMax: $PatchMax >> $LogFile
fi

SetBrightness () {
    # Calculate watch current percentage
    WatchAct=$(cat $WatchDriver/actual_brightness)
    WatchPer=$(( WatchAct * 100 / WatchMax ))
    [[ $fLogFile == true ]] && echo WatchAct: $WatchAct WatchPer: $WatchPer >> $LogFile
    # Reverse engineer patch brightness to set
    PatchAct=$(( PatchMax * WatchPer / 100 ))
    echo $PatchAct | sudo tee $PatchDriver/brightness
    [[ $fLogFile == true ]] && echo PatchAct: $PatchAct >> $LogFile
}

# When machine boots, set brightness to last saved value
SetBrightness

# Wait forever for user to press Fn keys adjusting brightness up/down.
while (true); do
    inotifywait --event modify $WatchDriver/actual_brightness
    [[ $fLogFile == true ]] && \
        echo "Processing modify event in $WatchDriver/actual_brightness" >> $LogFile
    SetBrightness
done

原始答案2018 年 6 月 11 日。

正在进行中的答案

许多 nVidia 用户在 Ubuntu 18.04 中遇到类似的问题：

在编写脚本之前

我可以编写一个脚本来模拟 /acpi_video 的变化并填充 /nv_backlight，但在我尝试这个之前：

  • 编辑/etc/default/grub。
  • 寻找quiet splash
  • 添加溅水背景：acpi_backlight=vendor
  • 保存文件
  • 跑步sudo update-grub

根据这个答案它应该适合你：Xubuntu 18.04：使 Fn 亮度键与 /sys/class/backlight/nv_backlight/ 配合使用

韦兰

亮度在 Wayland 下不起作用。确保您没有使用它。请参阅：笔记本电脑屏幕的亮度无法通过按钮或滑块调整。编辑

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