Re: [gentoo-user] Re: Virtualbox-guest-additions-4.3.24 breaks 3D acceleration in linux guests (?)

[Alan McKinnon <alan.mckinnon@gmail.com>]

On Thu, 05 Mar 2015 16:27:25 -0800
walt <w41ter@gmail.com> wrote:

> On 03/05/2015 02:25 PM, walt wrote:
> > Downgrading Virtualbox to 4.3.20-r1 fixes the problem on one ~amd64
> > machine but, of course, not the other one <sigh>.
> 
> For reasons I don't know, the gentoo devs split the "guest-additions"
> into two parts: they put the vboxvideo kernel module into the gentoo
> xf86-video-virtualbox package, and the vboxguest+vboxsf kernel modules
> into the virtualbox-guest-additions package.
> 
> Anyway, starting with a vbox gentoo snapshot from Mar 3 (before the
> update to vbox-4.3.24) I upgraded only the virtualbox-guest-additions
> (not the xf86-video-virtualbox package) and found that everything
> still works normally.
> 
> I then upgraded the xf86-video-virtualbox package and discovered that
> 3D video acceleration was broken, just as before.
> 
> I then downgraded the xf86-video-virtualbox package to 4.3.20 (leaving
> the virtualbox-guest-additions at 4.3.24) and found the 3D
> acceleration working normally again.
> 
> That clearly implicates the vboxvideo.ko kernel module as the cause of
> the breakage, I think.
> 
> Opinions/comments are most welcome.


File a bug at b.g.o.

what you describe has much potential to trip up many people :-)

Alan