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[Timo Aaltonen <tjaalton@xxxxxxxxxx>]

I've backported this commit:

commit e404ba8d06ff2a1bdb916a9e5d2c09cacd7e5ca3
Author: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Date:   Mon Aug 17 18:46:20 2015 +0300

    drm/i915: Setup DDI clk for MST on SKL
    
    Set up the DDI->PLL mapping on SKL also for MST links. Might help make
    MST operational on SKL.
    
    v2: Rebased due to KBL
        Improve the patch subject, Jesse provided the new one
    
    Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
    Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
    Link: http://patchwork.freedesktop.org/patch/msgid/1439826380-18403-1-git-send-email-ville.syrjala@xxxxxxxxxxxxxxx
    References: https://bugs.freedesktop.org/show_bug.cgi?id=91791
    Reviewed-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>

for our i915_bpo driver, and it has been tested to fix the hang.

** Changed in: linux (Ubuntu Vivid)
   Importance: Undecided => High

** Changed in: linux (Ubuntu Vivid)
       Status: New => In Progress

** Changed in: linux (Ubuntu Vivid)
     Assignee: (unassigned) => Timo Aaltonen (tjaalton)

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https://bugs.launchpad.net/bugs/1515169

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

Status in linux package in Ubuntu:
  New
Status in linux source package in Vivid:
  In Progress
Status in linux source package in Wily:
  New
Status in linux source package in Xenial:
  New

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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