为什么我的外接显示器突然停止工作?

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我非常沮丧,因为我被困在家里(COVID-19锁住了),然后我去市区安装扩展坞和显示器,这样我就可以在家工作几天又几天,当我把所有东西都插在家里时,键盘和鼠标工作正常,但监视器完全未被检测到。

In the past I've had this happen for a day or two, but usually a system update resolves it. It's been a week and I still have no external monitor. xrandr ends with:

DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis

我在Lenovo X1上运行18.04.4 LTS。扩展坞只是一个Thinkpad USB-C扩展坞。

Another question ( Ubuntu does not recognize external monitors when attached through docking station) suggests that I might need drivers, but this worked two weeks ago, so that seems unlikely.

在这里我还有其他故障排除步骤吗?

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