我刚刚将笔记本电脑升级到 20.04，但无法让第二台显示器工作。
仅限英特尔硬件。
lshw 仅显示一个屏幕
teknopaul@pc:~$ sudo lshw -C display
*-display
description: VGA compatible controller
product: HD Graphics 530
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 06
width: 64 bits
clock: 33MHz
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:131 memory:de000000-deffffff memory:c0000000-cfffffff ioport:f000(size=64) memory:c0000-dffff
dmesg 中没有明显信息。
使用相同的硬件，在以前的 Ubuntu 版本上一切正常，尝试了几个显示器和电缆。
uname -a
Linux pc 5.4.0-26-generic #30-Ubuntu SMP Mon Apr 20 16:58:30
内核日志
...] [drm] Initialized i915 1.6.0 20190822 for 0000:00:02.0 on minor 0
...] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
...] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input31
...] fbcon: i915drmfb (fb0) is primary device
...] Console: switching to colour frame buffer device 240x67
...] i915 0000:00:02.0: fb0: i915drmfb frame buffer device