显示屏亮度无法调节18.04
我最近在XPS 15 9560上安装了Ubuntu mate 18.04。我无法通过任何方式调整显示亮度。我尝试了以下方法： 在启动参数中设置acpi_backlight = vendor 使用了xbacklight，可以得到以下结果 。 xypnox@xypnox-xps:~$ xbacklight -set 50 No outputs have backlight property 我也在xbacklight上关注了另一个问题：没有输出具有背光属性-没有/ sys / class / backlight文件夹，并且的输出sudo find /sys/ -type f -iname '*brightness*'是 xypnox@xypnox-xps:~$ sudo find /sys/ -type f -iname '*brightness*' /sys/devices/platform/dell-laptop/leds/dell::kbd_backlight/brightness_hw_changed /sys/devices/platform/dell-laptop/leds/dell::kbd_backlight/max_brightness /sys/devices/platform/dell-laptop/leds/dell::kbd_backlight/brightness /sys/devices/platform/i8042/serio0/input/input4/input4::capslock/max_brightness /sys/devices/platform/i8042/serio0/input/input4/input4::capslock/brightness /sys/devices/platform/i8042/serio0/input/input4/input4::numlock/max_brightness /sys/devices/platform/i8042/serio0/input/input4/input4::numlock/brightness /sys/devices/platform/i8042/serio0/input/input4/input4::scrolllock/max_brightness /sys/devices/platform/i8042/serio0/input/input4/input4::scrolllock/brightness /sys/module/video/parameters/brightness_switch_enabled /sys/module/i915/parameters/invert_brightness