Gnome-Shell freezes/crashes after resuming from suspend

[Cerin]

In Ubuntu 14.04.2 LTS using the Nouveau graphics driver on a Macbook Pro 5,5, if I suspend (either by closing the lid or by running pm-suspend), the computer correctly suspends, but after it resumes, my screen activates and I see my entire desktop and can move my mouse, but all the other controls and windows are frozen.

Expected result:
After resuming from suspend, a login prompt should be shown to unlock my desktop.

Actual result:
A frozen unusable desktop is shown.

Attempted fixes:

Initially, I'm able to switch the a console via Alt+F4 and login, so I can confirm the kernel hasn't crashed. From this console, I've tried restarting gnome-shell with:

    gnome-shell --replace

but that has no effect. I've also tried restarting lightdm with:

    sudo service lightdm restart

which does immediately kick me out of the shell and back to lightdm/gnome-shell, but the interface is still frozen, but now also the Fn keys, so now I'm unable to return to the console. At this point, I'm forced to do a hard-reboot. This bug essentially disables the suspend/resume feature on my laptop, making it significantly less useful, since I suspend my laptop frequently.

Thinking it may be a problem with Nouveau, I tried purging it and installing the proprietary Nvidia drivers with the "Additional Drivers" dialog, but after rebooting, my screen was almost completely unusable. It displays a window showing "Your screen is running in low-resolution mode" with an OK button that allows selection of possible alternatives, like reconfiguring X or exiting to a console, but these options either immediately jump back to this menu, or freeze the screen entirely. Attempting to "continue with the current resolution" results in a completely black flickering screen.

This may still be a bug in Nouveau, as google shows several similar bug reports with resuming using this driver. However, since none of those reports were able to confirm this, much less fix it, I can't say for sure. Also, since on a fresh reboot with Nouveau, my desktop works and even after resuming from suspend, I can see my desktop, I'm inclined to think the problem may be some other component. Please let me know if there's someway I can more positively identify the source of the problem. I causally checked the Xorg.log and dmesg and didn't see any errors, but I'm not sure what I should be looking for. Nouveau seemed to report resuming from suspend had succeeded.

Some users reported a similar problem happened after upgrading kernels, such as from 3.13.0-24 to 3.13.0-49, so I tried reverting to the 3.13.0-24 kernel, but that didn't fix the problem and caused my wireless to stop working as well.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gnome-shell 3.10.4-0ubuntu5.2
ProcVersionSignature: Ubuntu 3.13.0-49.83-generic 3.13.11-ckt17
Uname: Linux 3.13.0-49-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue Apr 21 08:58:04 2015
DisplayManager: lightdm
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to trusty on 2015-04-19 (1 days ago)

[Cerin (chrisspen)]

One bizarre "workaround" I just discovered was if I attach a second monitor via the mini-display port, it fixes it! The login screen still doesn't come up, so this bug creates a minor security issue, but my desktop is otherwise again fully usable.

[Cerin (chrisspen)]

Unfortunately, the workaround seems to be somewhat unstable. A few times, gnome-shell completely froze on me. The first 2 times, I was able to fix it by unplugged and replugging my external monitor.

The third time, that didn't work, but I was till able to login via a shell. I tried running `gnome-shell --replace` and `xrefresh` and even `xrandr --output LVDS1 --auto` but they all reported "unable to open X display".

I didn't see any other options, but then I realized my fan was on full blast so I checked `top -c` and saw that a python3 process running apport was consuming 100% CPU. When I killed that, a lightdm login screen immediately came up.

Looking in my /var/log/apport.log, it seems Xorg is crashing, but also apport is experiencing some exceptions.

[Launchpad Janitor (janitor)]

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

[Omission5311 (omission5311)]

Has nothing to do with Nouveau for me. Been using proprietary Nvidia drivers from day one and 100% of suspend sessions freeze after resuming usually within a minute or less.

Base system is a fresh Ubuntu GNOME 16.04.1 install.

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1262201, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.