virtualbox.org

at least I think it's VBoxTestOGL, but it might be a different process communicating through dbus. The log from VBoxTestOGL with the --test 2D option says 2D is supported, but the segfault means that the GUI didn't get the message and ends up thinking that 2D Graphics Acceleration isn't supported, as a workaround I have VBoxTestOGL a symlink to /bin/true until this is resolved. I don't know whether this is a VirtualBox problem or a Qt problem, think I should file a bug report?

VBoxTestGL 5.1.0_OSE r108711 linux.amd64 (Jul 19 2016 20:43:56) release log

It seems you're not using the "official" version from https://www.virtualbox.org/wiki/Downloads . Could you test with the one you download from there?

404
http://download.virtualbox.org/virtualb ... _amd64.run

seems they just updated it to 5.1.2, I'm going to check if they fixed the issue and report back

ok, wasn't fixed in 5.1.2, just tried the PUEL version and it no longer segfaults, but 2D is still not available, although at least VBoxTestOGL now actually says it's not available in the log

OK, that's a different problem then, isn't it?
I'm thinking that you should open a new thread with an appropriate title and mark this one as solved.
You'll need to launch a VM and capture the log. See: Minimum information needed for assistance before you post your problem.

I'm pretty sure 2D is not available to a Linux guest. In fact it should show as invalid if you try to enable it.

Perryg wrote:I'm pretty sure 2D is not available to a Linux guest. In fact it should show as invalid if you try to enable it.

I'm on a Linux Host (Arch Linux to be specific) with a Windows Guest, I keep a Windows VM around as a last resort

Works for me. Maybe it is your build that is faulty.

seems to work perfectly fine as root, also this didn't happen with version 5.0

ok, seems to be caused by my widget theme, despite it not having a GUI