XGetImage returns junk with Xorg/dummy_drv/VTs

Daniel Stone daniel at fooishbar.org
Fri Nov 21 20:42:47 PST 2008

On Fri, Nov 21, 2008 at 03:23:03PM -0700, McDonald, Michael-p7438c wrote:
>   I'm trying to run the Xorg server using the dummy driver in the
> "background" in Linux. Everything works fine as long as the dummy Xorg
> has the VT "focus". If it's in the background, then XGetImage returns
> junk data.
>   It seems like the VT code is somehow causing the framebuffer to get
> swapped out. Can someone give me a hint as to what's going on? And how
> to work around it if there is a work around?
>   Or how to compile Xorg with VT support?

Yeah, when you don't have vtSema, your rendering is just random crap.
You probably want Xvfb instead of Xorg+dummy.

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