我正在尝试将两台显示器连接到我的 Ubuntu 14.04.3 桌面。我的第一台显示器通过 RS-232 电缆连接到 CPU，并且已启动并运行。第二台显示器连接到显示链接适配器，其另一端是与 CPU 的 USB 连接。当我启动时，我在第二台显示器上看到一些启动消息，但是当第一台显示器的登录加载时，一旦我登录到第一台显示器，第二台显示器就会崩溃。
这些是我的规格：
foo@bar ~ $ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.3 LTS
Release: 14.04
Codename: trusty
foo@bar ~ $ uname -r
3.16.0-50-generic
foo@bar ~ $
foo@bar ~ $ lsusb
Bus 002 Device 003: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 413c:2107 Dell Computer Corp.
Bus 003 Device 004: ID 17e9:019a DisplayLink
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
foo@bar ~ $
foo@bar ~ $ xrandr --query
Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 16384 x 16384
DVI-I-0 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 518mm x 324mm
1920x1200 60.0*+
1920x1080 60.0
1680x1050 60.0
1600x1200 60.0
1280x1024 60.0
1280x960 60.0
1024x768 60.0
800x600 60.3
640x480 59.9
DVI-I-1 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
~ $ lspci -vnn | grep -i VGA -A 12
02:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK107GL [Quadro K600] [10de:0ffa] (rev a1) (prog-if 00 [VGA controller])
Subsystem: NVIDIA Corporation Device [10de:094b]
Flags: bus master, fast devsel, latency 0, IRQ 82
Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f0000000 (64-bit, prefetchable) [size=32M]
I/O ports at e000 [size=128]
[virtual] Expansion ROM at fb000000 [disabled] [size=512K]
Capabilities: <access denied>
Kernel driver in use: nvidia
02:00.1 Audio device [0403]: NVIDIA Corporation GK107 HDMI Audio Controller [10de:0e1b] (rev a1)
Subsystem: NVIDIA Corporation Device [10de:094b]
~ $ sudo lshw -C video
*-display
description: VGA compatible controller
product: GK107GL [Quadro K600]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:02:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:82 memory:fa000000-faffffff memory:e0000000-efffffff memory:f0000000-f1ffffff ioport:e000(size=128) memory:fb000000-fb07ffff
我尝试了各种帖子，让第二台显示器工作，但都没有奏效。我还尝试将第二台显示器切换为直接使用 RS32 电缆，同时将第一台显示器连接到显示链接适配器，这导致第二台显示器开始工作，而第一台显示器显示黑屏。从设置中检测显示也不起作用。
答案1
我能够使用 DVI 转 Display 电缆和适配器（而不是 DisplayLink USB 适配器）让两个显示器工作。我还将 Ubuntu 升级到了最新版本。我非常确定问题与 DisplayLink 适配器相同。