Help: problem with X11 / XFree86-DRI ; who to blame?

[Jonathan Underwood]

On 09/01/2008, Rob <spamrefuse at yahoo.com> wrote:
>
> Hi,
>
> My OS is an up-to-date version of Fedora 7 on a Intel based PC.
>
> I use a particular academic/scientific video rendering software VMD
> ( http://www.ks.uiuc.edu/Research/vmd/ ).
> This software uses GLX/Mesa heavily.
>
> My day-to-day window manager is XFCE. When I use VMD, it immediately
> freezes keyboard/mouse on my console as soon as any video rendering
> activity occurs. The typical error message in /var/log/messages is:
>
>     kernel: [drm:i915_wait_irq] *ERROR* i915_wait_irq: EBUSY --
>                rec: 147447 emitted: 147473
>
> However, when I switch to KDE window manager, all this does not occur.
>
> Obviously I first blamed XFCE, but the developers there are convinced
> that the Xorg and/or related X11-video drivers are to be blamed.
>
> Eventually I solved the problem: I disabled XFree86-DRI in the file
> /etc/X11/xorg.conf.
>
> Is there anybody who knows about this matter and can help me
> understand what's going on?
> I'd like to report this problem somewhere, but who is to be blamed?
>   XFCE ? (they deny)
>   Xorg ?
>   Fedora ?
>   XFree86-DRI ?

It would be well worth reporting this in bugzilla.redhat.com if you
can give a recipe for reproducing the problem. I'm not sure what
component you should file it against (maybe even the kernel), but if
you make an educated guess, and it is wrong, the bug will be
re-assigned.