[Novalug] Fedora 12 video question

[greg pryzby]

On Wed, Oct 21, 2009 at 11:56 AM, Bryan J Smith <b.j.smith at ieee.org> wrote:

> Yes, overlays often have issues with spanned framebuffers.
> The overlay often only works on the first framebuffer,
> although it may not work on either, depending on implementation.
>
> Are you using Xinerama?  Or is the X driver doing the spanning?
>

Display from pull down menu, so I am pretty sure it is X.


> In a nutshell, anytime you use a hardware feature - overlay
> buffers (motion video), z-buffer (3D), etc..., it's not going work
> over Xinerama, possibly only one display or neither.  You must
> use an X driver that still supports these features when spanned
> across multiple screens.
>
> Most X drivers use a single framebuffer for multiple screens
> to solve this issue, although it introduces other issues, because
> X doesn't know about the individual screens like it would with
> Xinerama.  Fortunately FreeDesktop standards have defined many
> settings/APIs so even single framebuffer X drivers can correctly
> communicate where individual displays start and end.
>
> In-a-nutshell:
>
> Unless I'm using a nVidia card, I don't span screens and expect
> overlay support.  For my T60, I mirror screens instead of
> spanning so they are the same framebuffer.


Bad on me because I thought I broken something and rebuild the server. Good
thing it was a new build w/o any configuration/tweaking.



-- 
greg pryzby                              greg at pryzby dot org
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