[vbox-dev] Monitor count limitations

Rūdolfs Bundulis rudolfs.bundulis at gmail.com
Wed Sep 3 22:39:01 GMT 2014


>I just tested a VBoxHeadless VM with 24 monitors at 1920x1200 and 256 MB
>of guest VRAM and it seems to work fine.

I fixed errors on my side, and still got the same (which is still much
better than with the WDDM driver) but it seems that you actually cannot run
that many monitors on full hd. I tried 25,24,20,16 and all these numbers
resized to 1280x720, didn't go much lower, but I will find the boundary. I
looked at VBoxHeadless, since it was mentioned that it did work, and I saw
that VBoxHeadless actually injects only one IFramebuffer instance. So can
that actually affect the behaivor? What happens if no IFramebuffer
implementation is provided for the a display? Does that count as a
disconnected video output or what?

2014-09-03 12:01 GMT+03:00 Rūdolfs Bundulis <rudolfs.bundulis at gmail.com>:

> Hi,
> I made a new Windows 7 machine and installed the guest additions without
> the 3D support, verified that the XPDM files were installed and now the
> machine booted to 1280x720 at all 25 monitors and my software acutally run
> out of memory for the NV12/H264 buffers so I guess if I fix that I should
> be able to go to 1920x1200, thanks for the pointers on XPDM, I'll fix
> everything on my side with the memory and try again.
> 2014-09-02 17:07 GMT+03:00 Rūdolfs Bundulis <rudolfs.bundulis at gmail.com>:
>  Yes. However HGSMI is "The Interface" between the vitual graphics card
>>> and the host and
>>> therefore can not be disabled.
>>> Moreover HGSMI does not affect the memory allocation much.
>>> The monitor count is limited by the screen surface memory.
>> Thanks a lot for the explanation.
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