调节屏幕亮度

[jimxxx]

Debian7 下，笔记本上按Fn+《--- 调节亮度时，可以看到出现的图标亮度减少，可是实际不变。同样，在设置中调亮度也是一样。解决办法：
这种方法的基本使用条件是：intel 显卡对背光亮度起作用，在“/sys/class/backlight”下面有两个目录“acpi_video0”和“intel_backlight”，按亮度调节键时只对“acpi_video0”下面的“brightness”起作用，但真正对背光亮度起作用却是“intel_backlight”下面的“brightness”值

wrote a rules of "/etc/udev/rules.d/99-writeintelbacklight.rules" as below:

ACTION=="change", SUBSYSTEM=="backlight", RUN+="/usr/sbin/writeintelbacklight.sh"

A shell: "/usr/sbin/writeintelbacklight.sh"

#!/bin/bash

intelmaxbrightness=`cat /sys/class/backlight/intel_backlight/max_brightness`
acpimaxbrightness=`cat /sys/class/backlight/acpi_video0/max_brightness`
scale=`expr $intelmaxbrightness / $acpimaxbrightness`
acpibrightness=`cat /sys/class/backlight/acpi_video0/brightness`
newintelbrightness=`expr $acpibrightness \* $scale`
curintelbrightness=`cat /sys/class/backlight/intel_backlight/actual_brightness`
if [ "$newintelbrightness" -ne "$curintelbrightness" ]
then
echo $newintelbrightness > /sys/class/backlight/intel_backlight/brightness
fi
exit 0

Of course, you need do a "sudo chmod +x /usr/sbin/writeintelbacklight.sh"

反正我是通过这种方法解决了这个问题，特此分享

[warmsun]

虽然无此问题～还是感谢分享

[xdyplaystation]

Debian7 下，笔记本上按Fn+《--- 调节亮度时，可以看到出现的图标亮度减少，可是实际不变。同样，在设置中调亮度也是一样。解决办法：
这种方法的基本使用条件是：intel 显卡对背光亮度起作用，在“/sys/class/backlight”下面有两个目录“acpi_video0”和“intel_backlight”，按亮度调节键时只对“acpi_video0”下面的“brightness”起作用，但真正对背光亮度起作用却是“intel_backlight”下面的“brightness”值

wrote a rules of "/etc/udev/rules.d/99-writeintelbacklight.rules" as below:

ACTION=="change", SUBSYSTEM=="backlight", RUN+="/usr/sbin/writeintelbacklight.sh"

A shell: "/usr/sbin/writeintelbacklight.sh"

#!/bin/bash

intelmaxbrightness=`cat /sys/class/backlight/intel_backlight/max_brightness`
acpimaxbrightness=`cat /sys/class/backlight/acpi_video0/max_brightness`
scale=`expr $intelmaxbrightness / $acpimaxbrightness`
acpibrightness=`cat /sys/class/backlight/acpi_video0/brightness`
newintelbrightness=`expr $acpibrightness \* $scale`
curintelbrightness=`cat /sys/class/backlight/intel_backlight/actual_brightness`
if [ "$newintelbrightness" -ne "$curintelbrightness" ]
then
echo $newintelbrightness > /sys/class/backlight/intel_backlight/brightness
fi
exit 0

Of course, you need do a "sudo chmod +x /usr/sbin/writeintelbacklight.sh"

反正我是通过这种方法解决了这个问题，特此分享

非常感谢楼主，解决了我的问题。唯一的差别是我的环境需要脚本中读 acpi_video1 这个， 这两天眼睛要被亮瞎了。 非常感谢！！

[napoleonlijun]

thank you me too but my file is video1

[onlylove]

核心显卡？

[eexpress]

这只是hack下udev的设置错误。

[jzhur0726]

Debian7 下，笔记本上按Fn+《--- 调节亮度时，可以看到出现的图标亮度减少，可是实际不变。同样，在设置中调亮度也是一样。解决办法：
这种方法的基本使用条件是：intel 显卡对背光亮度起作用，在“/sys/class/backlight”下面有两个目录“acpi_video0”和“intel_backlight”，按亮度调节键时只对“acpi_video0”下面的“brightness”起作用，但真正对背光亮度起作用却是“intel_backlight”下面的“brightness”值

wrote a rules of "/etc/udev/rules.d/99-writeintelbacklight.rules" as below:

ACTION=="change", SUBSYSTEM=="backlight", RUN+="/usr/sbin/writeintelbacklight.sh"

A shell: "/usr/sbin/writeintelbacklight.sh"

#!/bin/bash

intelmaxbrightness=`cat /sys/class/backlight/intel_backlight/max_brightness`
acpimaxbrightness=`cat /sys/class/backlight/acpi_video0/max_brightness`
scale=`expr $intelmaxbrightness / $acpimaxbrightness`
acpibrightness=`cat /sys/class/backlight/acpi_video0/brightness`
newintelbrightness=`expr $acpibrightness \* $scale`
curintelbrightness=`cat /sys/class/backlight/intel_backlight/actual_brightness`
if [ "$newintelbrightness" -ne "$curintelbrightness" ]
then
echo $newintelbrightness > /sys/class/backlight/intel_backlight/brightness
fi
exit 0

Of course, you need do a "sudo chmod +x /usr/sbin/writeintelbacklight.sh"

反正我是通过这种方法解决了这个问题，特此分享

chmod: 无法访问"/usr/sbin/writeintelbacklight.sh": 没有那个文件或目录

[陈小草]

多此一举

gnome3有个扩展可以调节亮度
支持开机自动恢复关机时的亮度

[blueyi]

很久没回帖了，今天特别登录上回复一次，这个问题让我花了好多个夜晚未搞定，非常感谢，想知道原文在哪，为何我google如此多的帖子未找到这个，谢谢

[blueyi]

另外一个问题想楼主是如何解决的，就是这样调整亮度之后，重启机器亮度就又变成最大了。突然想起来很多年前，大学时使用ubuntu8.04,一安装完系统就什么都看不见了，明显能感觉到机子已经启动了，难道是由于屏幕亮度自动变成最低导致什么也看不见了吗。还好，现在是最亮的，请问楼主是否可以保存亮度呢，谢谢