我在 ThinkPad T14s Gen 2 上运行 Ubuntu，并使用 ThinkPad Universal USB-C 扩展坞。Ubuntu 可以判断两个显示器都已连接，xrandr输出也证实了这一点。但是，我一次只能打开一个，并且无法在显示设置菜单中应用更改。我也尝试在显示设置中将两者设置为 60hz，但即使如此，它仍然不允许我应用更改。两个显示器都是 27 英寸 LG，通过显示端口连接到扩展坞，并且笔记本电脑已关闭，因此内置显示器不应使用资源。
如果我将一台显示器直接插入笔记本电脑，而不是两台都来自扩展坞，那么我就可以同时使用这两台显示器。
Ubuntu 信息：
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 22.04.3 LTS
Release: 22.04
Codename: jammy
xrandr 输出：
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-4 disconnected (normal left inverted right x axis y axis)
DP-3-1 disconnected (normal left inverted right x axis y axis)
DP-3-2 connected (normal left inverted right x axis y axis)
1920x1080 144.00 + 120.00 119.88 119.98 99.93 74.99 60.00 50.00 59.94
1280x1024 119.96 75.02 60.02
1440x900 119.98
1280x960 99.91
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 119.93 75.03 60.00
800x600 119.93 99.86 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 119.80 75.00 60.00 59.94
720x400 70.08
DP-3-3 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
1920x1080 144.00*+ 120.00 119.88 119.98 99.93 74.99 60.00 50.00 59.94
1280x1024 119.96 75.02 60.02
1440x900 119.98
1280x960 99.91
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 119.93 75.03 60.00
800x600 119.93 99.86 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 119.80 75.00 60.00 59.94
720x400 70.08
DVI-I-4-4 disconnected (normal left inverted right x axis y axis)
DVI-I-3-3 disconnected (normal left inverted right x axis y axis)
DVI-I-2-2 disconnected (normal left inverted right x axis y axis)
DVI-I-1-1 disconnected (normal left inverted right x axis y axis)
设置菜单：
