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[Tim Chen <1471708@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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

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

Summary:
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

Steps:
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)

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);
         }

** Affects: oem-priority
     Importance: Critical
         Status: New

** Affects: oem-priority/trusty
     Importance: Critical
         Status: New

** Affects: unity-settings-daemon (Ubuntu)
     Importance: Undecided
         Status: New

** Also affects: oem-priority
   Importance: Undecided
       Status: New

** Also affects: oem-priority/trusty
   Importance: Undecided
       Status: New

** Changed in: oem-priority
   Importance: Undecided => Critical

** Changed in: oem-priority/trusty
   Importance: Undecided => Critical

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

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

Status in OEM Priority Project:
  New
Status in OEM Priority Project trusty series:
  New
Status in unity-settings-daemon package in Ubuntu:
  New

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

  Summary:
  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

  Steps:
  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)

  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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