20.04 Intel HD Graphics 4000 多显示器

20.04 Intel HD Graphics 4000 多显示器

我是 Linux 菜鸟。自从从 Bionic 升级到 Focal 后,我支持多台显示器的能力实际上已经消失了。我见过类似的问题,但我还没有找到可行的解决方案。系统信息和 Xrandr 输出如下

  • HP Revolve 810 G1 合盖
  • 英特尔酷睿 i5-3437U CPU @ 1.90GHz
  • 2 台戴尔 U2415 显示器连接到带有 2 个 DP 输出的 HP 超薄扩展坞(我相信它们是 DP 1.2)
  • 英特尔® 高清显卡 4000 (IVB GT2)
  • Ubuntu 20.04.1 LTS
  • GNOME 3.36.3 X11
  • X.Org 版本 1.20.8

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)  
    DeviceName: 64  
    Subsystem: Hewlett-Packard Company 3rd Gen Core processor Graphics Controller  
    Kernel driver in use: i915  
    Kernel modules: i915  

Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384  
LV-DS-1 connected (normal left inverted right x axis y axis)  
VGA-1 disconnected (normal left inverted right x axis y axis)  
HDMI-1 disconnected (normal left inverted right x axis y axis)  
DP-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm   
   1920x1200     59.95*+  
HDMI-2 disconnected (normal left inverted right x axis y axis)  
HDMI-3 disconnected (normal left inverted right x axis y axis)  
DP-2 disconnected (normal left inverted right x axis y axis)  
   1920x1080     60.00  
DP-3 disconnected (normal left inverted right x axis y axis)

  *-display                 
       description: VGA compatible controller
       product: 3rd Gen Core processor Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:32 memory:d0000000-d03fffff memory:c0000000-cfffffff ioport:2000(size=64) memory:c0000-dffff

似乎对 DP-2 有所了解,但无论我如何连接电缆或使用哪种电缆(直接连接到基座、连接到笔记本电脑的内置 DP 输出或菊花链式连接),都没有任何变化,我的第二台显示器是黑色的。

我知道它支持多台显示器,因为当我打开盖子时,我可以看到多台显示器(LVDS 和 DP-1)。如果有更多信息或我需要采取的故障排除步骤,请告诉我。

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