System lockup during boot if not i915.modeset=0 or nomodeset is used

[Maurits Lamers]

Booting without the nomodeset or i915.modeset=0 results in a complete system lockup during boot.
This has increasingly been happening in the later versions of Lubuntu 14.10, but after upgrade to 15.04 has become permanent.

The only way to start is using the nomodeset or i915.modeset=0 settings, which reduces the resolution which can be used.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2.1
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: LXDE
Date: Sun Apr 26 19:17:48 2015
InstallationDate: Installed on 2015-03-18 (39 days ago)
InstallationMedia: Lubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to vivid on 2015-04-26 (0 days ago)

[penalvch (penalvch)]

Maurits Lamers, 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 1448720

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

[Launchpad Janitor (janitor)]

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