On Tue, 2006-06-27 at 15:30 +0200, Martijn van Oosterhout wrote:
> On 6/27/06, Martijn van Oosterhout <[EMAIL PROTECTED]> wrote:
> > > See r128FlushVerticesLocked(), e.g.
> >
> > The thing is there's this optimisation that avoid loading the
> > cliprects everytime if there are less than three. However, that relies
> > on people notifying eachother when they've changed.
>
> And we have a winner! If I remove the optimisation that avoids
> uploading the cliprects everytime, the problem vanishes, completely.
> So the hardware cliprects are being blatted and my guess is that it's
> the Xserver doing it, given it's the only other thing accessing the
> hardware, and it doesn't do it via the DRM driver.
>
> The question is, how to fix it. I've downloaded the source for
> xserver-xorg-video-ati but the only time it ever seems to do any
> locking is changing screen modes.
>
> Where else in the xserver is the DRI locking dealt with?
In DRIDo{Wakeup,Block}Handler(), in hw/xfree86/dri/dri.c. SwitchMode()
has to do it explicitly because it can be called outside of these.
> However, the Xserver doesn't fiddle the aux clip rects, only the primary,
> which should be correctly restored.
> OTOH, this code seems very suspicious:
>
> info->sc_right = INREG(R128_SC_RIGHT);
> info->sc_top = INREG(R128_SC_TOP);
> info->sc_bottom = INREG(R128_SC_BOTTOM);
> info->aux_sc_cntl = INREG(R128_SC_BOTTOM);
>
> Shouldn't that last one be R128_AUX_SC_CNTL? Maybe it restores the wrong
> value?
Maybe, have you tried it? :)
--
Earthling Michel Dänzer | http://tungstengraphics.com
Libre software enthusiast | Debian, X and DRI developer
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