video mode switches make graphical processes unstable?

[Shevek]

Not sure what to hang this on. I have a Lenovo T550 with an Intel HD5500.

It barely worked in Ubuntu 14.04 so here we are on 15.04 beta.

light-locker seems to change video mode, so logging out and logging in again breaks the desktop.
xscreensaver does not suffer from this problem.

Sometimes I get weird sideways-scrolling of the entire display (analogue tv anyone?)

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
Uname: Linux 3.19.0-9-generic x86_64
ApportVersion: 2.16.2-0ubuntu3
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Mar 19 11:05:36 2015
InstallationDate: Installed on 2015-03-05 (14 days ago)
InstallationMedia: Xubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to vivid on 2015-03-19 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[nLinked (nlinked-deactivatedaccount)]

Can confirm same sideways-scrolling of the entire display on Lenovo Yoga 3 11, same Intell HD5500 graphics on 15.04.

[Alberto Salvia Novella (es20490446e)]

Please:
  1. Report to <https://bugs.freedesktop.org/>.
  2. Paste the new report URL here.
  3. Set this bug status back to "confirmed".

Thank you.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[penalvch (penalvch)]

Shevek, 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 xorg 1434219

Please ensure you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

[Shevek (r-launchpad-anarres-org)]

This was months ago, and I have taken another solution which does not involve the Ubuntu intel xserver or light-locker.

[Launchpad Janitor (janitor)]

[Expired for xserver-xorg-video-intel (Ubuntu) because there has been no activity for 60 days.]