unity crashes with Bus Error when I enable my second monitor.

[Raymond Wells]

My Setup:

Version: Ubuntu 13.10
Video Card: ATI Radeon 2600XT on Open Source Drivers (fglrx is unavailable for this card on 13.10)
Montor #1@1920x1080
Monitor #2:@1440x900 on left of Monitor #1

How to reproduce:

Open "Displays" from the dash. Select the secondary monitor. Turn the secondary monitor off (in the settings, not the physical button on the monitor), and click "Apply."
Close "Displays". Reopen it.
Select the secondary monitor. Turn the secondary monitor on (in the settings; not on the monitor, itself.)
Put the secondary monitor to the left of the primary monitor.
Click "Apply"

Expected Results:
Secondary Display turns on, and I am prompted to keep my settings or revert.

Actual Results:
Brief screen garbage, followed by unity crashing. Whenever I try to resurrect Unity from a either VT or a terminal emulator running in X, I see "Bus Error (core dumped)". This continues until I end my session.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity 7.0.0daily13.04.18~13.04-0ubuntu1
ProcVersionSignature: Ubuntu 3.9.0-1.5-generic 3.9.1
Uname: Linux 3.9.0-1-generic x86_64
ApportVersion: 2.10-0ubuntu3
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,compiztoolbox,grid,mousepoll,place,imgpng,gnomecompat,session,move,resize,regex,vpswitch,unitymtgrabhandles,animation,wall,wobbly,workarounds,fade,expo,scale,ezoom,unityshell,dbus]
Date: Sat May 11 18:20:31 2013
InstallationDate: Installed on 2013-02-28 (72 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130225)
MarkForUpload: True
SourcePackage: unity
UpgradeStatus: Upgraded to saucy on 2013-05-05 (6 days ago)

[Raymond Wells (rfw2nd)]

I should mention these things I've tried:

$ unity --replace
$ sudo unity --distro

And resetting org.compiz in gconf.

these steps did not help :(

[Raymond Wells (rfw2nd)]

This time I had to reboot the computer to get Unity back. I tried restarting LightDM, killing dbus-daemon, that didn't work, so I rebooted and unity came back.

[Launchpad Janitor (janitor)]

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

[Andrea Azzarone (azzar1)]

Can you still reproduce the bug? Can you provide a stacktrace?

[Launchpad Janitor (janitor)]

[Expired for Unity because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

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