启用systemd-backlight@intel_backlight而不是@acpi_video0 0

Question

我在/sys/class/backlight/ - acpi_video0和intel_backlight中有两个文件.intel_backlight控制我的屏幕亮度(echo/cat)，而acpi_video0是默认的。

默认情况下，服务systemd-backlight@acpi_video0.service是启用的，它应该在关机/启动时保存/恢复亮度，但由于指向错误的文件，它无法工作。

在尝试启用systemd-backlight@intel_backlight.service时，我得到以下消息：

The unit files have no [Install] section. They are not meant to be enabled
using systemctl.
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
   .wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
   a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
   D-Bus, udev, scripted systemctl call, ...).

我该怎么解决这个问题？

Answer 1

您可能只是缺少了命令的backlight:部分：

# systemctl enable systemd-backlight@backlight:intel_backlight.service

您还可能需要转义:，即：

# systemctl enable systemd-backlight@backlight\:intel_backlight.service

因为在/sys/class/backlight/中有两个文件夹，所以您可能有两个显卡。拱维基建议在引导加载程序中添加以下内核参数之一：

acpi_backlight=video
acpi_backlight=vendor
acpi_backlight=native
acpi_backlight=none