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[Launchpad Bug Tracker <1471708@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package unity-settings-daemon -
14.04.0+14.04.20150825-0ubuntu1

---------------
unity-settings-daemon (14.04.0+14.04.20150825-0ubuntu1) trusty; urgency=medium

  [ Alberto Milone ]
  * Make touchscreen mapping non-blocking, and kill it if it takes more
    than 3 seconds; finally, in case of failure, try again after a few
    seconds. This helps on resume from S3 (LP: #1471708). (LP: #1471708)

 -- CI Train Bot <ci-train-bot@xxxxxxxxxxxxx>  Tue, 25 Aug 2015 09:20:43
+0000

** Changed in: unity-settings-daemon (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1471708

Title:
  SRU: For skylake system, u-s-d cause a black screen when resume from
  S3 via Lid Close

Status in OEM Priority Project:
  Triaged
Status in OEM Priority Project trusty series:
  Triaged
Status in unity-settings-daemon package in Ubuntu:
  Fix Released
Status in unity-settings-daemon source package in Trusty:
  Fix Released

Bug description:
  OEM LP private bug: https://bugs.launchpad.net/bugs/1466441

  Title: Sometimes system turns a black screen when resume from S3 via
  Lid Close

  [Impact]

  Sometimes system turns a black screen when resume from S3 via Lid Close
  It only has cursor on screen but still can switch to tty1.
  Failure rate ~ 1/5

  [Test Case]
  1. install Ubuntu 14.04.2 & 3.19+ kernel and boot to OS
  2. Close the lid
  3. Open the lid
  4. check the display status

  Expected results: System should resume to the log in screen when open
  the lid

  Actual results:
  System sometimes fails to resume back to the log in screen but blackscreen instead.
  (Failure rate~ 1/5)

  [Regression Potential]
  Low. Killing touchscreen mapping after 3 seconds should not affect any other input device.

  Details:

  unity-settings-deamon will call "xinput --map-to-output 11 eDP1" at background,
  and it's being blocked so only cursor will show on screen.

  1. Switch to tty1 when this happen
  2. Login with user account on tty1.
  3. Use "DISPLAY=:0 xrandr " on commandline you'll see it's being blocked.

  Since xinput is being blocked for some unknown reason (in gdb it shows
  polling on xcb_connect_to_fd() in XOpenDisplay() ),

  a possible workaround is to set a timeout for xinput in u-s-d.

  === modified file 'plugins/xrandr/gsd-xrandr-manager.c'
  --- plugins/xrandr/gsd-xrandr-manager.c	2014-06-05 11:56:15 +0000
  +++ plugins/xrandr/gsd-xrandr-manager.c	2015-07-01 08:59:56 +0000
  @@ -2199,7 +2199,7 @@
           if (gnome_rr_output_info_is_active(output)) {
                   g_debug ("Mapping touchscreen %d onto output %s",
                            device_id, name);
  - sprintf (command, "xinput --map-to-output %d %s",
  + sprintf (command, "timeout 3s xinput --map-to-output %d %s",
                            device_id, name);
                   status = system (command);
           }

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