操作系统：Ubuntu 20.04.3 x86_64 内核：5.11.0-36-generic CPU：Intel Celeron B800 (2) @ 1.5GHz 显卡：Intel HD Graphics
我强制 xrandr 输出到 VGA-1，它可以工作，但那个显示器上的 gnome 不行，我可以将鼠标移到那里，我可以拖动窗口到那里，但没有背景，什么都没有。Gnome 设置也无法检测到它。
我用了xrandr --output VGA-1 --mode 1920x1080_60.00 --right-of LVDS-1
xrandr输出是
Screen 0: minimum 320 x 200, current 3286 x 1080, maximum 8192 x 8192
LVDS-1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
1366x768 59.99*+ 40.00
1360x768 59.80 59.96
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 60.06
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
2560x1440_60.00 60.00
2432x1368_60.00 60.00
2176x1224_60.00 60.00
1920x1080_60.00 60.00
1664x936_60.00 60.00
1600x900_60.00 60.00
1536x864_60.00 60.00
1440x810_60.00 60.00
VGA-1 disconnected 1920x1080+1366+0 (normal left inverted right x axis y axis) 0mm x 0mm
1920x1080_60.00 60.00*
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
a1920x1080_60.00 (0x161) 172.800MHz -HSync +VSync
h: width 1920 start 2040 end 2248 total 2576 skew 0 clock 67.08KHz
v: height 1080 start 1081 end 1084 total 1118 clock 60.00Hz