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ubuntu 20.04 未检测到第三个显示器

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ubuntu 20.04 未检测到第三个显示器

我正在运行带有 2 个显卡的 Ubuntu 20.04，一个 AMD Radeon 550 和一个 nvidia GeForce GT420。我试图同时运行 4 个显示器，但无论我将它们插入哪张卡或哪个端口，都只能检测到其中 2 个。

sudo lshw -c video下面是在 amd 上有 2 个显示器、在 nvidia 上有 2 个显示器的输出：

  *-display UNCLAIMED       
       description: VGA compatible controller
       product: GF108 [GeForce GT 420]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:25:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller cap_list
       configuration: latency=0
       resources: memory:f6000000-f6ffffff memory:e8000000-efffffff memory:f0000000-f1ffffff ioport:d000(size=128) memory:f7000000-f707ffff
  *-display
       description: VGA compatible controller
       product: Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:26:00.0
       version: c7
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
       configuration: driver=amdgpu latency=0
       resources: irq:63 memory:d0000000-dfffffff memory:e0000000-e01fffff ioport:f000(size=256) memory:f7a00000-f7a3ffff memory:c0000-dffff

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