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I am having better luck than others at using e1649Fwu monitor; at least I can see my desktop, albeit not at the same time as on the other screen. (see Using AOC USB monitor on Ubuntu for an existing unsolved issue)

I seem to be stuck at Xorg configuration stage. I am unable to configure Xorg to use both screens, laptop-internal and e1649Fwu USB screen, at the same time. Here's some info to start with:

Laptop: MacBook Pro 9,1
USB Monitor: AOC e1649Fwu

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 12.04.4 LTS
Release:    12.04
Codename:   precise

$ uname -a
Linux work 3.11.0-19-generic #33~precise1-Ubuntu SMP Wed Mar 12 21:16:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
(#Latest kernel installed by `sudo apt-get install linux-image-generic-lts-saucy`)

$ nvidia-xconfig --version

nvidia-xconfig:  version 331.20  (buildmeister@swio-display-x86-rhel47-05)  Wed Oct 30 18:20:53 PDT 2013
  The NVIDIA X Configuration Tool.

Following are hardware configurations I am trying, and the associated files I use as /etc/X11/xorg.conf.

Hardware Configurations:

  1. Laptop-only, xorg.conf.backup
  2. Boot with USB monitor attached, xorg.conf.backup
  3. Boot with USB monitor attached, xorg.conf.displaylink_nvidia

The xorg.conf.displaylink_nvidia file was generated by nvidia-xconfig, and then I added 'DisplayLink' settings to it.

Here's the description of behaviour I see in the above configurations:

In HW-Config-1

  1. I am able to see my Ubuntu desktop, and work normally. No external screens, no complications.

In HW-Config-2

  1. The USB monitor gets the initial boot-time Ubuntu splash screen, complete with the dots under the logo changing color indicating progress.

  2. But the login screen, and the subsequent Desktop, show up on the laptop screen.

  3. When switching to console mode by Ctrl-Alt-{1,6} the laptop screen goes blank and the USB montor shows those console-mode screens, which are perfectly usable (the display does get garbled when I run less, but top and vim work just fine).

  4. I can easily switch back to GUI desktop by Ctrl-Alt-7, and the laptop screen shows the desktop while the USB screen freezes with whatever content it had at the time of switching.

  5. The framebuffer device shows up as /dev/fb0

    crw-rw---- 1 root video 29, 0 Apr 9 17:56 /dev/fb0

(Also see images hw-config-2.*.jpg at http://gurjeet.singh.im/e1649Fwu/)

In HW-Config-3

  1. The boot sequence starts with laptop screen, but after it detects the USB screen, everything moves to that screen. The laptop screen is left with the initial boot-time warning messages, which never change.

  2. When switching to console mode and back to GUI mode, using Ctrl-Alt-{1,7}, all activity happens on USB screen, and it all works flawlessly! But no activity on the laptop screen.

(Also see images hw-config-3.*.jpg at http://gurjeet.singh.im/e1649Fwu/)

I have uploaded the dmesg outputs and Xorg.0.log files for the different hardware configurations at http://gurjeet.singh.im/e1649Fwu/. I don't see anything obviously wrong in those logs, except that in configuration-3's Xorg.0.log I see that Xorg chooses to unload nvidia driver on line 163.

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