Re: Direct rendering causing lock ups?

[Benoit Joseph <benoit.joseph@teledisnet.be>]

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Hello,

I'm using an ATI radeon QD with DRI inabled and openGL without any 
problem. 

Benoit

Le Mercredi 16 Octobre 2002 20:45, Glynn Clements a écrit :
> Paul Furness wrote:
> > I just (for various reasons) re-built my workstation from scratch,
> > using Red Hat 7.3 and then applying updates.
> >
> > After getting it all working nicely, I noticed that when I switch
> > from X to a text terminal (ctrl-alt-F1) and then back to X, the
> > whole box hangs. It won't allow telnet or ssh and I can't kill the
> > X server (ctrl-alt-BS) so the only fix is the 'Big Red Switch'
> > solution.
> >
> > After some messing around, and chatting to a friend who also found
> > this problem, we have come to the conclusion that it is related to
> > DRI mode Radeon configuration; if we turn on DRI, X is much faster
> > but crashes the box when switching VT. If we turn off DRI, no
> > crash.
> >
> > My questions:
> >
> > 1) Has anyone else seen this behavior? Is it restricted just to ATI
> > Radeon cards?
>
> I haven't seen that exact behaviour. However, my experience (with a
> Matrox G400) is that DRI problems tend to be fatal. If an OpenGL
> program crashes when using DRI, any recovery is normally limited to
> Alt-SysRq-K to kill the X server (requires "Magic SysRq" support in
> the kernel), followed by Ctrl-Alt-Delete for a clean shutdown. Trying
> to do anything else normally results in a hard lockup that even
> Alt-SysRq-* can't touch.
>
> > 2) Does anyone know how to _stop_ this behavior? I'd really like to
> > keep DRI because of the speed, but I'd also really like to have a
> > system that lets me do what it's supposed to!
>
> I'm pretty sure that you have to choose between DRI or reliability;
> they seem to be mutually exclusive.
>
> Personally, I set LIBGL_ALWAY_INDIRECT=1 in /etc/profile, so OpenGL
> uses indirect (i.e. software) rendering by default, and explicitly
> unset it if I need the perfomance (but I'll save files, close
> programs and run "sync" beforehand).

- -- 
JOSEPH Benoit
	benoit.joseph@teledisnet.be
	joker@baby-linux.net
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