Public bug reported:


 * VirtualBox Version 5.2.8 r121009 (Qt5.6.2)
 * Windows 7 host
 * VirtualBox 3D Acceleration enabled, given 128MB video memory
 * VirtualBox guest additions installed.
 * Log in with either Ubuntu (Xorg) or GNOME (Xorg) (both are actually 
 * Open a File browser or a Terminal, or probably anything
 * Maximize the window (this part is also pretty slow)
 * Unmaximize the window


 * Maximize and unmaximize take a fraction of a second. System operates
as normal afterwards.


 * Maximize is already pretty slow - the first frame of the animation takes a 
few seconds to render and then freezes, then a few more seconds later the 
window is full screen.
 * Unmaximize just locks up gnome-shell for 30s or so. Eventually it repaints, 
but the shell is now completely unusable - no more repaints. I waited minutes 
and it still didn't come back to life. This happens 100% of the time.

I *can* switch to another VT, and log in in text mode, and see that
gnome-shell is occasionally showing activity at 40+%. I can switch back
to GNOME and still see the frozen screen.

NB: Unity works fine, as it did in 17.04.

I suspect something that gnome-shell does with OpenGL that unity didn't
do is triggering a software fallback or something. Is there any way to
run a diagnostic to test / benchmark the OpenGL capabilities used by

Thanks, apologies in advance if I missed any critical information. Happy
to provide more system details.

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: New

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  17.10: gnome-shell regularly locks up in VirtualBox - unity is still

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