I am trying to hook up two monitors to my Ubuntu 14.04.3 desktop. My First monitor is connected to the CPU via an RS-232 cable, and is up and running. The second monitor is connected to a display link adapter, whose other end is a USB connection to the CPU. When I boot up, I see some startup messages on the second monitor, but when the first monitor's login loads, the second monitor crashes once I login to the first monitor.
These are my specs:
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 : 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 : 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
I have tried various posts on getting the second monitor to work, butnone have worked. I also tried switching the second monitor to use the RS32 cable directly while connecting the first monitor to the display link adapter, which caused the second to start working and first to show a black screen. The detect displays from the settings did not work either.