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[Bug 1515169] Re: [i915_bpo][SKL-U] System hangs when VGA monitor plugged in


The computer is connected to two monitors to the motherboards DVI and VGA outputs.
When I installed Ubuntu version 16.04, i had a problem - after every computer restart VGA-monitor says "going to sleep" and darkens.
If I open "System Settings->Dysplays" and click on the monitor that is connected to the VGA, 
"Switch Off->Apply->Keep Configuration" and then again "Switch On->Apply->Keep Configuration"
then both monitors are working normally, but after each restart i have to repeat these steps again.

The second option is - on the monitor settings, i set a small "Turn off inactive" time (1 minute) 
and when the computer is switched on or restarted, I wait while the first monitor (DVI) is "going to sleep" 
and then moving the mouse wakes up both. But if just turn on the computer and use it then VGA monitor never wakes up.

On two different computers with different motherboards MSI A75MA-P35 and the ASUS F1A75-V EVO,
but the same processors AMD A8-3870K with integrated Radeon graphics, the result is the same.

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  [i915_bpo][SKL-U] System hangs when VGA monitor plugged in

Status in linux package in Ubuntu:
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Wily:
Status in linux source package in Xenial:

Bug description:
  A system being certified hangs hard when a VGA monitor is plugged in.
  The machine has a built-in DP MST bridge, but the driver has no
  support for MST. Upstream recently added a patch to add support for
  it, and it improves the situation that there's no hang anymore.
  Monitor still stays blank but that'll need another SRU once a patch
  for it is available.

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