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 the 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 lockups.
> > 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 monitor
> > has received the signal from the new Xserver.
> >
> > If I kill the kdm process and then restart it everything will be ok. (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 = 0;
> > + pMga->reg_ien = 0;
> > }
> >
> > /* Cleanup DMA */
>
> Can anyone explain to me what exactly this patch or the one for radeon
> do? My guess/understanding is that this prevents interrupts from being
> 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 Dänzer \ Debian (powerpc), XFree86 and DRI developer
Software libre enthusiast \ http://svcs.affero.net/rm.php?r=daenzer
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