我连接了两个屏幕。
xrandr --listmonitors
Monitors: 2
0: +*DVI-I-1-1 1920/598x1080/336+1600+0 DVI-I-1-1
1: +HDMI-1 1600/621x1200/341+0+0 HDMI-1
xrandr --current | grep connected
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 621mm x 341mm
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
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 connected primary 1920x1080+1600+0 (normal left inverted right x axis y axis) 598mm x 336mm
但是，当我尝试改变第一个的亮度时，视觉上没有任何变化。
xrandr --output DVI-I-1-1 --brightness 0.6 --verbose
crtc 0: 1920x1080 60.00 +1600+0 "DVI-I-1-1"
我试图改变其亮度的屏幕已通过 HDMI 转 USB 适配器连接。运行 Ubuntu 20.04.6。