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

 

Public bug reported:

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.

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "combined file of the lightdm logs"
   https://bugs.launchpad.net/bugs/1456531/+attachment/4400095/+files/lightdm.files.log

-- 
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Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1456531

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

Status in lightdm package in Ubuntu:
  New

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1456531/+subscriptions


Follow ups

References