ubuntu系统每次启动屏幕都是最大亮度问题的解决方法
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>这个方法你尝试过没</p>
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首先你要确保有这个文件:</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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/sys/class/backlight/acpi_video0/brightness</div>
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cat出来的值就是你当前的屏幕亮度.<br>
我们修改下面的文件加入一些用户启动设置:</p>
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<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
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<span><u>复制代码</u></span>
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代码如下:</div>
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sudo gedit /etc/rc.local</div>
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在 exit 0 的上方加入以下代码(确保exit 0没有被注释掉):</p>
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<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
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<span><u>复制代码</u></span>
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代码如下:</div>
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echo 屏幕亮度值 > /sys/class/backlight/acpi_video0/brightness</div>
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这样开机最后读取这个文件将 屏幕亮度值 动态写入 brightness文件中,以更改当前亮度.</p>
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下面这个方法与上面差不多，但是确定可以使用</p>
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进入系统后，先调整合适的亮度，然后查询该亮度的数值，</p>
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然后按下面步骤操作即可</p>
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<div class="msgheader" style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
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<span><u>复制代码</u></span>
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代码如下:</div>
<div class="msgborder" id="phpcode21" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
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$ cat /sys/class/backlight/intel_backlight/brightness <br>
976<br>
$ sudo vim /etc/rc.local</div>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'> </span><br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>#加上下面一行命令，下次开机的时候就会显示现在调整的亮度</span>
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<span><u>复制代码</u></span>
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代码如下:</div>
<div class="msgborder" id="phpcode22" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
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echo 976 > /sys/class/backlight/intel_backlight/brightness</div>
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如果上面的无效，则把brightness换成actual_brightness</p>
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<span><u>复制代码</u></span>
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代码如下:</div>
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/sys/class/backlight/intel_backlight/actual_brightness</div>
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