使用xrandr
设置多屏显示
$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 294mm x 165mm
1920x1080 59.93*+
1680x1050 59.95 59.88
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1280x800 59.99 59.97 59.81 59.91
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
700x525 59.98
800x450 59.95 59.82
640x512 60.02
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
640x400 59.88 59.98
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
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+ 60.00 50.00 59.94
1920x1080i 60.00 60.00 50.00 59.94
1600x1200 60.00
1280x1024 75.02 60.02
1152x864 75.00
1280x720 60.00 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00 50.00
720x576i 50.00 50.00
720x480 60.00 60.00 59.94 59.94 59.94
720x480i 60.00 60.00 59.94 59.94
640x480 75.00 60.00 59.94 59.94
720x400 70.08
观察输出可知,连接了两个显示器 (eDP-1, HDMI-2),其中 eDP-1 是主显示器。如果第二块屏幕无显示,执行下面的命令。
xrandr --output HDMI-2
又,指定分辨率为 1920x1080,
xrandr --output HDMI-2 --mode 1920x1080
又,设置为右侧扩展屏,即光标向右可移动至第二块屏,
xrandr --output HDMI-2 --right-of eDP-1
又,连接上第二块屏,想关掉内置显示屏,(警告:不要随便关掉内置屏)
xrandr --output eDP-1 --off
又,开启内置屏。
xrandr --output eDP-1 --auto
某些情况下会无法检测显示器的最大分辨率,此时需要手动设置显示器的分辨率。参考此处。
# 获取参数值
$ cvt 2560 1440
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync
# 新建 mode
$ xrandr --newmode "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493 -hsync +vsync
# 为指定显示设备 add mode
$ xrandr --addmode HDMI2 "2560x1440_60.00"
# 指定显示器分辨率
$ xrandr --output HDMI2 --mode "2560x1440_60.00"
如果显示屏分辨率更改成功但窗口显示不完整(即只有左上角以指定分辨率显示,其他部分空白),可以尝试关闭内置显示屏,此时显示器应该能以完整窗口显示内容。