Re: [Dri-devel] [volodya@mindspring.com: [Xpert]Guide to debugging DRI installations]

[Jens O. <je...@je...>]

Vladimir,

Your page looks very helpful.  Thanks for putting it together.  The only
comment I have is regarding your first miscellaneous comment:

"While hardware 3d is active nothing except your Xserver should be
accessing your video card - or your system will lockup hard. In
particular, frame grabber cards that write directly to video memory
should be turned off. If you want to use these cards try out v4l module
in XFree 4.x.x."

I think the intent of this message is good for users--but it's
misleading to developers trying to understand our architecture.  To
clarify, direct rendering is completely based on the idea of a client
side driver accessing the hardware directly without using the Xserver to
exclusively access the device.

However, all access to the video device must be closely coordinated, and
come from a suite of drivers that know each other well.  Using drivers
that don't cooperate closely, or even mixing older and newer driver
components can introduce the lockups you describe.

I hope this helps.

Regards,
Jens

Daryll Strauss wrote:
> 
> This might be useful to some of the folks here, so I thought I would
> pass it along.
> 
>                                                 - |Daryll
> 
> ----- Forwarded message from vo...@mi... -----
> 
> Date: Wed, 20 Jun 2001 14:41:18 -0400 (EDT)
> From: vo...@mi...
> To: liv...@li..., xp...@xf...
> Subject: [Xpert]Guide to debugging DRI installations
> 
> I've put up a "Guide to debugging DRI installations" at
> 
>  http://www.linuxvideo.org/gatos/dri-debug.html
> 
> Comments are very welcome. In particular I seem to have lost the e-mail
> with comparison of FPS numbers from glxgears with software versus hardware
> 3d. Can whoever wrote it remind me ?
> 
>                      Vladimir Dergachev
> 
> _______________________________________________
> Xpert mailing list
> Xpert@XFree86.Org
> http://XFree86.Org/mailman/listinfo/xpert
> 
> ----- End forwarded message -----
> 
> _______________________________________________
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> Dri...@li...
> http://lists.sourceforge.net/lists/listinfo/dri-devel

--                            /\
    Jens Owen                /  \/\ _    
  je...@je...             /    \ \ \   Steamboat Springs, Colorado