group.of.nepali.translators team mailing list archive

[Timo Aaltonen <tjaalton@xxxxxxxxxx>]

and the patch is in -hwe-16.04 backport for xenial

** Changed in: xorg-server (Ubuntu Xenial)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1720133

Title:
  USB 3.0 displays are black on Ubuntu after x.org update to 1.18.3 or
  newer

Status in xorg-server package in Ubuntu:
  Fix Released
Status in xorg-server source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * This impacts all Ubuntu releases which received an update of x.org
  to 1.18.3 or newer, i.e. Ubuntu 16.04, 16.10, 17.04 & 17.10

   * End users are unable to use their USB displays unless they
  workaround the problem which currently involves disabling pageflip for
  modesetting in x.org.conf file

   * The fix which has been submitted to x.org extends blacklisting
  mechanism so the EVDI kernel module which is essential for DisplayLink
  USB 3.0 devices to work is correctly recognised by x.org. Then the
  PRIME sync is disabled in such case; The patch can be found here:
  https://cgit.freedesktop.org/xorg/xserver/commit/?id=fbd80b2c8ebe9fd41229dc5438524d107c071ff1

  [Test Case]

  1. On a PC device with Ubuntu install DisplayLink SW for Ubuntu v1.3.54 downloaded from http://www.displaylink.com/downloads/ubuntu. Detailed requirements and instructions can be found here:  
  2. Plug in a DisplayLink USB 3.0 compatible device, e.g. Dell D3100 docking station
  3. Plug in an external monitor (HDMI or DisplayPort) to the docking station

  Expected result: 
  The external monitor should light up and show the desktop

  Actual result: 
  The monitor remains black or shows frozen desktop.

  [Regression Potential]

   * The patchset extends number of modules for which x.org changes its
  functionality. It checks if "evdi" string is in the syspath so it is
  quite unlikely there would be any impact on anything else then USB 3.0
  displays which use EVDI module.

  [Other Info]
   
   * The patch has been applied to Ubuntu x.org source code built and tested.

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