最近建造了一台用于数据处理的计算机。以下是其组件：
- 主板：Tuf Gaming Z690-plus Wifi D4
- CPU：第 12 代英特尔® 酷睿™ i7-12700K × 20
- 无 GPU
- 操作系统：Ubuntu 20.04.4 LTS
- GNOME 版本 3.36.8
我有两个显示器，它们互相连接并互相镜像。我想更改设置，让一个显示器扩展另一个显示器，但系统似乎没有识别其中一个显示器。
设置窗格如下所示：
这是运行的结果xrandr：
$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080
default connected primary 1920x1080+0+0 0mm x 0mm
1920x1080 77.00*
再次，我知道两个显示器都可以工作，因为它们都显示相同的屏幕。一个通过 HDMI 连接，另一个通过 DP 连接。
编辑：
以下是gpu-manager.log
log_file: /var/log/gpu-manager.log
last_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
new_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
can't access /run/u-d-c-nvidia-was-loaded file
can't access /opt/amdgpu-pro/bin/amdgpu-pro-px
Looking for nvidia modules in /lib/modules/5.13.0-37-generic/kernel
Looking for nvidia modules in /lib/modules/5.13.0-37-generic/updates/dkms
Looking for amdgpu modules in /lib/modules/5.13.0-37-generic/kernel
Looking for amdgpu modules in /lib/modules/5.13.0-37-generic/updates/dkms
Is nvidia loaded? no
Was nvidia unloaded? no
Is nvidia blacklisted? no
Is intel loaded? yes
Is radeon loaded? no
Is radeon blacklisted? no
Is amdgpu loaded? no
Is amdgpu blacklisted? no
Is amdgpu versioned? no
Is amdgpu pro stack? no
Is nouveau loaded? no
Is nouveau blacklisted? no
Is nvidia kernel module available? no
Is amdgpu kernel module available? no
Vendor/Device Id: 8086:4680
BusID "PCI:0@0:2:0"
Is boot vga? yes
Error: can't access /sys/bus/pci/devices/0000:00:02.0/driver
The device is not bound to any driver.
Error : Failed to open /dev/dri
Error : Failed to open /dev/dri
Error : Failed to open /dev/dri
Error : Failed to open /dev/dri
Does it require offloading? no
last cards number = 1
Has amd? no
Has intel? yes
Has nvidia? no
How many cards? 1
Has the system changed? No
Single card detected