Re: [Dri-devel] MGA and lockups during shutdown or switchmode

[Panagiotis P. <pap...@cs...>]

Also I forgot to say that I got a lockup again when I tried to switch to a
VT with the previous patch and also that I believe that with 2.5.6X
kernels I get lockups sooner, than with 2.4.X.

Regards
=09Panagiotis Papadakos

On Sat, 5 Apr 2003, Panagiotis Papadakos wrote:

> Could this be a kernel problem?
>
> I have been using 2.4.21-preX and 2.5.6X and all show for me the same
> behaviour, with IO-APIC enabled or not.
> It reminds me the problem I have with my Promise controller
> which after a while if I have dma enabled it completely locks my machine.
>
> What kernel are you using at the moment to just try and test it?
>
> My system is an Athlon 600, on an ASUS K7V with KX133, Matrox G400 and a
> Live!
>
> Regards
> =09Panagiotis Papadakos
>
> On Sat, 4 Apr 2003, Michel [ISO-8859-1] D=E4nzer wrote:
>
> > On Fre, 2003-04-04 at 22:38, Eric Anholt wrote:
> > > On Fri, 2003-04-04 at 11:12, Panagiotis Papadakos wrote:
> > > > For some months now I am experiencing lockups when I switched to th=
e VTs,
> > > > or changed the video modes or if I tried to shutdown the Xserver.
> > > >
> > > > So I applied the following patch, after looking the related radeon =
patch
> > > > and now I can switch to the VTs or change the videomode without loc=
kups.
> > > > But when I press Ctrl+Alt+Delete, sometimes my machine will lockup =
before
> > > > kdm starts a new Xserver or it will lockup right away after my moni=
tor
> > > > has received the signal from the new Xserver.
> > > >
> > > > If I kill the kdm process and then restart it everything will be ok=
=2E (At
> > > > least when I tried it)
> > > >
> > > > So can anyone please help?
> > > >
> > > > This is the patch:
> > > >
> > > > --- mga_dri.c   2003-04-04 22:02:21.000000000 +0300
> > > > +++ mga_dri.c_new       2003-04-04 16:26:31.000000000 +0300
> > > > @@ -1359,6 +1359,7 @@
> > > >     if (pMga->irq) {
> > > >        drmCtlUninstHandler(pMga->drmFD);
> > > >        pMga->irq =3D 0;
> > > > +      pMga->reg_ien =3D 0;
> > > >     }
> > > >
> > > >     /* Cleanup DMA */
> > >
> > > Can anyone explain to me what exactly this patch or the one for radeo=
n
> > > do?  My guess/understanding is that this prevents interrupts from bei=
ng
> > > reenabled on server reset before the irq handler is readded.
> >
> > That's my understanding as well.
> >
> > > But why does this cause a hang?
> >
> > I'm not sure, maybe some kernels and/or machines don't like the
> > interrupt being enabled without the handler being installed. I couldn't
> > reproduce the problem on my Macs.
> >
> >
> > --
> > Earthling Michel D=E4nzer   \  Debian (powerpc), XFree86 and DRI develo=
per
> > Software libre enthusiast  \     http://svcs.affero.net/rm.php?r=3Ddaen=
zer
> >
> >
> >
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