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[Bug 1456531] Re: LightDM (?) blank/white screen after resume from suspend

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sun, 27 Sep 2015 19:54:34 -0000
Reply-to: Bug 1456531 <1456531@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

lxg, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal:
apport-collect -p linux 1456531

When reporting bugs in the future please use apport by using 'ubuntu-
bug' and the name of the package affected. You can learn more about this
functionality at https://wiki.ubuntu.com/ReportingBugs.

** Package changed: xserver-xorg-video-intel (Ubuntu) => linux (Ubuntu)

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

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1456531

Title:
  LightDM (?) blank/white screen after resume from suspend

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On Xubuntu 15.04, when I suspend the machine and resume afterwards,
  the screen remains completely white/blank. I can move the mouse
  cursor, but I don't see any screen elements. Clicking or wildly
  pressing keys doesn't do anything.

  I can switch to a different console with Ctrl+Alt+F1 and log in, just
  fine.

  For this bug report, I have removed all files from /var/log/lightdm,
  then rebooted, suspended, resumed, and switched to VT1. Then copied
  the /var/log/lightdm files to a different location. See their contents
  attached to this bug report.

  Other parameters:

  - Simply locking and unlocking the screen works, ALTHOUGH I also see
  the white screen there at first, and have to click a mouse button for
  the login form to show up.

  - I'm running a system with a fully encrypted hard-drive and have
  configured LightDM to log me in automatically.

  - System is up-to-date.

  - No experimental packages, although I had an experimental version of
  xserver-xorg-video-intel running, but removed it shortly after.

  - System is a Thinkpad T450s with Intel HD 5500 graphics.

  Hope I didn't forget to mention anything important. If you need more
  information or want me to try something, let me know.

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