Comment 13 for bug 1224098

Not sure whether this is the correct place to post the following -

I have been running lubuntu 13.10.1 with XFCE4.

I wanted to install nvidia-prime, so I decided to try the fix reported here to minimize any problems with nvidia prime. However, after installing the nvidia-prime_0.4.2~ubuntu13.10.1_all.deb, I am no longer able to log into xfce sessions and I can now only use lubuntu sessions.

laptop ASUS N550JV (Intel gpu & GT750M gpu)
Lubuntu 13.10.1 amd64 alternate install
                                        (dual boot encrypted Win 7 & encrypted LVM lubuntu)
Linux version 3.11.0-12-generic
                    (buildd@allspice) (gcc version 4.8.1 (Ubuntu/Linaro 4.8.1-10ubuntu7) )
Architecture: amd64
InstallationDate: Lubuntu Installed on 2013-10-28

Nvidia-319.32 x86_64 installed 2013-11-03

xfce4 4.10.1 metapackage
xfce4-goodies 4.10 metapackage
xbindkeys & xbindkeys-config packages
policykit-1-gnome

How I installed the drivers:
installed nvidia-319 using Synaptic
installed nvidia-settings using Synaptic
downloaded nvidia-prime_0.4.2~ubuntu13.10.1_all.deb
  from ux51vz.blogspot.com/2013/10/install-lubuntu1310-saucy-salamander.html which cited this launchpad bug entry (I think that is a blog post by Sebastien Coquelin, who posted at #10 here)
rebooted

Normal grub2 screen. Normal unlocking of encryption for the LVM.
But when attempt to login to xfce session, screen turns dark black for a couple of sessions, then slightly grey, then dark black again. Have to reboot and choose lubuntu session.

Initially in lubuntu session, multiple error message windows appeared:

The [xfce] panel has closed unexpectedly.
The application desktop [xfce] has closed unexpectedly.
Sorry, the application xbindkeys-config has stopped unexpectedly.
Sorry, Lubuntu 13.10 has experienced an internal error.
Invalid problem report (This problem report is damaged and cannot be processed. Permission error (1,'Operation not permitted')
Permission denied

I removed xbindkeys. On reboot, still couldn't log into xfce sessions.
I removed xfce4 and xfce4-goodies metapackages via Synaptic (marked for complete removal). Then reinstalled.

Still can't log into xfce sessions. Black screen. Have to reboot.
I can log into lubuntu sessions still (and now no longer see the multiple error messages when logging into lubuntu sessions).

nvidia-prime does seem to be working though (or maybe video limits have been removed?) because
- before installed nvidia-319 driver and nvidia-prime, glxspheres gave 60 fps, 67 Mpixels/sec
- after installed nvidia-319 and nvidia-prime, glxspheres gives 1300+ fps, 1500 Mpixels/sec