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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Mainline commit ecb7e16 is in 15.04 as of the Ubuntu-3.19.0-12.12 kernel as commit  b610fbd:
b610fbd drm: add helper to get crtc timings (v5)


Mainline commit 455a680 may not be needed.  Can you test the latest 15.04 kernel and see if this bug still exists?  The latest version is 3.19.0-15.15.

Thanks, in advance!

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https://bugs.launchpad.net/bugs/1446979

Title:
  [bug] screen is black after xrandr  rotate command

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Triaged

Bug description:
  When running "xrandr --output xxxxx --rotate inverted " on intel
  platforms with ubuntu 15.04, screen becomes black.

  Steps to reproduce:
  1. install ubuntu 15.04 with intel graphic card  and boot up into desktop
  2. run xrandr --output eDP1 --rotate inverted

  Expect result:
  eDP screen rotate inverted

  Actual result:
  eDP screen is black.

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