macos 10.15.6 更改的 hidpi 文件 RDM 切换分辨率无法生效呢？大佬帮忙

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13 寸 mac pro 配置 2k 显示器，想用 RDM 切换 1920*1080 ,之前可以的今天突然不行了。以下是设备信息

/AppleDisplay-10ac-200c"

以下是 hidpi 配置文件

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
  <key>DisplayProductName</key>
  <string>DELL D2421DS</string>
  <key>DisplayProductID</key>
  <integer>8205</integer>
  <key>DisplayVendorID</key>
  <integer>4268</integer>
  <key>scale-resolutions</key>
  <array>
    <data>AAAKAAAABaAAAAABACAAAA==</data>
    <data>AAAFAAAAAtAAAAABACAAAA==</data>
    <data>AAAHgAAABDgAAAABACAAAA==</data>  <!--1920*1080-->
  </array>
</dict>
</plist>

执行过 sudo defaults write /Library/Preferences/com.apple.windowserver DisplayResolutionEnabled -bool YES 命令，重启后还是没有效果求大佬帮忙，之前挺好的起来就不行了