lightdm crashes with systemd

[Hugo Venhorst]

system:
hardware: BTO laptop
CPU: Intel Core i7-3630qm @ 2,4 GHz x 8
RAM: 7,7 GiB
GPU 1: intel ivybridge Mobile
GPU 2: discrete NVIDIA card, optirun and nouveau installed.
OS: Ubuntu 15.04 64-bit

what i expected to happen:

After upgrade to 15.04, I restarted as per request. i expected the login screen to appear, and after entering my password, the Unity Desktop to load as it always did in 14.04 and 14.10.

What actually happens:

- plymouth (i have a custom theme with a loading bar) zips by real fast!
- in between Plymouth and Lightdm, a message appears, but time is too short for me to read.
- then Lightdm appears to load, but freezes up at varying points.
-the mouse pointer appears, but disappears.
-all input is lost! keyboard and mouse not responding
-any notifications about networking or other on screen at the moment of freeze are frozen along with it.
-lightdm screen elements load or don't at varying rates, sometimes a wallpaper, sometimes not. same with password box, dotted pattern, logo etc.
- no VT's available
- judging by HD activity LED, linux is still running somewhere in there.

i have to reboot using REISUB

this started happening after the upgrade.
I suspect is has to do with either:
- systemd,
- the latest linux kernel,
- GPU switching (laptop boots with NVIDIA card on, switches to Intel when lightdm loads)

Current workaround:
installed sddm (KDE's display manager i believe) and let it handle login instead of lightdm. it has no issues.

i tried starting from grub in Upstart mode, and with older kernels, and resuls vary. i was able to log in using lightdm succesfully more often at least.

i submitted this bug using "ubuntu-bug lightdm"

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: lightdm 1.14.0-0ubuntu2
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: Unity
Date: Sat Apr 25 23:53:02 2015
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=nl_NL.UTF-8
 SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Alberto Salvia Novella (es20490446e)]

With "optirun" you mean "primus", don't you?

[Hugo Venhorst (yougo)]

Yes, that'd be the correct name, sorry.

Should i run "ubuntu-bug primus" and report back here?

[Alberto Salvia Novella (es20490446e)]

No, that won't be necessary. But instead:
  1. Follow the instructions at <https://github.com/Bumblebee-Project/Bumblebee/wiki/Reporting-Issues>.
  2. Set this bug status back to "confirmed".

Thank you.

[Hugo Venhorst (yougo)]

followed instructions on https://github.com/Bumblebee-Project/Bumblebee/wiki/Reporting-Issues as requested

[Alberto Salvia Novella (es20490446e)]

Thank you.