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由 acpi 和 udev 事件调用时脚本行为不正常

tag-icon • tag-icon udev acpi xrandr
由 acpi 和 udev 事件调用时脚本行为不正常

/etc/acpi/events我在和中有以下文件/etc/udev/rules.d。

  • /etc/acpi/events/lidclose

    # Pass all events to our one handler script
event=button/lid
action=/etc/acpi/monitors.sh

  • /etc/udev/rules.d/80-monitor.rules

    # change monitor settings when monitor is plugged in or o$
ACTION=="change", SUBSYSTEM=="drm", HOTPLUG=="1", RUN+="/etc/acpi/monitors.sh"

  • 现在，（可执行文件并由root拥有）/etc/acpi/monitors.sh

    #!/bin/sh

# default monitor is LVDS1
STATE=internal
INTERNAL=LVDS1
EXTERNAL=HDMI3

# functions to switch from LVDS1 to VGA and vice versa
function internal {
    echo "Switching to internal"
    xrandr --output $EXTERNAL --off --output $INTERNAL --auto
    STATE=internal
}
function external {
    echo "Switching to external"
    xrandr --output $EXTERNAL --auto --output $INTERNAL --off
    STATE=external
}
function both {
    echo "Switching to both"
    xrandr --output $EXTERNAL --auto --right-of $INTERNAL --output $INTERNAL --auto --primary
    STATE=both
}

# functions to check if VGA is connected and in use
function externalConnected {
    ! xrandr | grep "^$EXTERNAL" | grep disconnected >/dev/null
}
function lidOpen {
    ! cat /proc/acpi/button/lid/LID/state | grep closed >/dev/null
}

# actual script
if ! [ $STATE == "both" ] && externalConnected && lidOpen
then
    both
fi

if ! [ $STATE == "external" ] && externalConnected && ! lidOpen
then
    external
fi

if ! [ $STATE == "internal" ] && ! externalConnected && lidOpen
then
    internal
fi

现在，我以 root 和我的用户身份测试了该脚本，它的工作非常顺利。我还在echo bla > /home/me/test其中放入了一些测试输出，当调用 by 时udev，acpid它会生成输出，因此它会被执行。唯一的事情是，什么也没有发生xrandr。

我缺少什么？如何记录脚本的输出以查找错误？

答案1

在对我的问题发表评论的人的帮助下，我找出了问题所在并在脚本中修复了它。

现在这里更新了如何使用笔记本电脑进行自动屏幕切换的例程。您需要 acpid、kms 和 udev。

为 acpi 和 udev 创建以下规则

/etc/acpi/events/lidclose

# Pass all events to our one handler script
event=button/lid
action=/etc/acpi/monitors.sh

/etc/udev/rules.d/80-monitor.rules

# change monitor settings when monitor is plugged in or o$
ACTION=="change", SUBSYSTEM=="drm", HOTPLUG=="1", RUN+="/etc/acpi/monitors.sh"

现在创建/etc/acpi/monitors.sh

#!/bin/sh

# specify the monitors to use
INTERNAL=LVDS1
EXTERNAL=HDMI3
USERNAME=oli

# set some variables needed to control the x server
export XAUTHORITY=/home/$USERNAME/.Xauthority
export DISPLAY=:0

# functions to switch from internal screen to external screen and vice versa or to use both screens together
function internal {
    echo "Switching to internal" >> /var/log/monitors.log
    xrandr --verbose --output $EXTERNAL --off --output $INTERNAL --auto >> /var/log/monitors.log 2>&1
}
function external {
    echo "Switching to external" >> /var/log/monitors.log
    xrandr --verbose --output $EXTERNAL --auto --output $INTERNAL --off >> /var/log/monitors.log 2>&1
}
function both {
    echo "Switching to both" >> /var/log/monitors.log
    xrandr --verbose --output $EXTERNAL --auto --right-of $INTERNAL --output $INTERNAL --auto --primary >> /var/log/monitors.log 2>&1
}

# functions to check if external monitor is connected and in use
function externalConnected {
    ! xrandr | grep "^$EXTERNAL" | grep disconnected >/dev/null
}
function lidOpen {
    ! cat /proc/acpi/button/lid/LID/state | grep closed >/dev/null
}

# actual script
if externalConnected && lidOpen
then
    both
fi

if externalConnected && ! lidOpen
then
    external
fi

if ! externalConnected && lidOpen
then
    internal
fi

希望它能起作用。

答案2

贾诺利弗溶液工作得几乎很好。一个小修复终于在我的系统上解决了有关 HOTPLUG 变量的问题：

/etc/udev/rules.d/80-monitor.rules:

# change monitor settings when monitor is plugged in or off
ACTION=="change", SUBSYSTEM=="drm", ENV{HOTPLUG}=="1", RUN+="/etc/acpi/monitors.sh"

即，更改HOTPLUG为ENV{HOTPLUG}.

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