☰

bash腳本redirect-brightness

tag-icon • tag-icon brightness acpi
bash腳本redirect-brightness

作業系統：Ubuntu - 18.04 LTS

我的目錄中有 2 個符號連結/sys/class/backlight/。

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/

亮度熱鍵可變更 的值acpi_video0/brightness。但這其實並沒有改變顯示器的亮度。

但是，手動更改該值nv_backlight/brightness實際上會改變顯示器的亮度。

因此，將熱鍵連結到nv_backlight而不是acpi_video0可以解決我的問題，但我不知道該怎麼做。

編輯：操作Fn鍵調整亮度（熱鍵）時，螢幕上會出現彈出滑桿進度條。

編輯：

  1. 輸入：

    cat /sys/class/backlight/nv_backlight/max_brightness

    輸出：

    100

  2. 輸入：

    cat /sys/class/backlight/nv_backlight/actual_brightness

    輸出（這個值自動改為相同的值，我手動輸入/sys/class/backlight/nv_backlight/brightness）：

    10

  3. 輸入：

    cat /sys/class/backlight/acpi_video0/max_brightness

    輸出：

    15

答案1

bash腳本redirect-brightness

您的問題是增加/減少亮度的功能鍵正在更新/sys/class/backlight/acpi_video0/brightness而不是/sys/class/backlight/nv_backlight/brightness

最初的請求是攔截功能鍵並用它們來控制nv_backlight驅動程式。這樣做的問題是：

  • 棘手的udev腳本
  • 沒有彈出通知滑桿顯示亮度，無需複雜的 Python 腳本。

解決方案是使用來inotify監視acpi_video0.然後計算亮度百分比並將相同的百分比套用到nv_backlight。

在下面的 bash 腳本中您需要設定：

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

將腳本放入/usr/local/bin並使用以下命令使其可執行：

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

首先使用命令列運行腳本

redirect-brightness -l

如果出現問題，請使用以下命令檢查日誌檔案：

cat /tmp/redirect-brightness.log

如果一切正常，請添加redirect-brightness到您的啟動應用程式中。

redirect-brightnessbash腳本

#!/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

原答案 2018 年 6 月 11 日。

正在進行中的工作答案

有許多 nVidia 用戶在 Ubuntu 18.04 中遇到類似問題：

在編寫腳本之前

我可以編寫一個腳本來模擬對 /acpi_video 的更改並填充 /nv_backlight 但在嘗試此操作之前：

  • 編輯/etc/default/grub。
  • 尋找quiet splash
  • 在飛濺後面添加：acpi_backlight=vendor
  • 儲存檔案
  • 跑步sudo update-grub

根據這個答案，它應該適合你：Xubuntu 18.04：讓 Fn 亮度鍵與 /sys/class/backlight/nv_backlight/ 一起使用

韋蘭

亮度在 Wayland 下不起作用。確保您沒有使用它。看：筆記型電腦螢幕的亮度無法透過按鈕或滑桿調整。編輯

相關內容