[PATCH v5 00/13] PRIME Synchronization

[Alex Goins]

So far I've been unable to reproduce this, but I don't see the Present extension
being used.

What exactly is your setup to get mutter running against X using DRI3? I've
ensured that DRI3 page flipping is enabled (it's required for PRIME
synchronization too anyway), and glamor_egl->dri3_capable == TRUE. Maybe I'm
missing something. Is there something out of tree that I need? I don't see
anywhere where the present extension is actually used, only initialized.

I also tried a mixed-head configuration and it seems to work fine, although you
mentioned it worked OK with DRI2 so that probably doesn't mean much until I can
resolve the above.

Thanks,
Alex

On Fri, 29 Apr 2016, Alex Goins wrote:

> > Okay I've finally gotten around to playing with these today.
> 
> Thanks!!
> 
> > I'm using a i915 + nouveau system with nouveau running as the master. Both
> > using modesetting DDX.
> > 
> > The basics seem to work okay, but I am seeing some issues I'm not 100% sure
> > are the fault of these patches.
> > 
> > Scenario 1:
> > start X, start mutter against X (using DRI3), start gnome-terminal,
> > drag g-t around
> > seems smooth.
> > set provider output, xrandr in a new display, drag g-t around, I get
> > choppy rendering
> > on the main display, the offloaded display is smooth!
> > 
> > I don't think this happens with DRI2 mutter, so I'm not 100% sure what
> > is going on there,
> > I assume it's something to do with page flipping not being allowed for
> > present anymore.
> 
> My test machine at the time I sent these out was an Optimus laptop, so I don't
> think I have tried mixed native and offloaded displays with modesetting source
> except once briefly the other day. I have a desktop machine with offloading
> capabilities now, so I'll try that more in depth.
> 
> > Scenario 2:
> > start X, set provider output, xrandr in a new display, start mutter in
> > DRI3 mode, things
> > go horribly wrong. Again it seems fine in DRI2 mode. so I expect this
> > is some interaction
> > with the present extension fighting this.
> > 
> > I'm going to try and look at the interfaces a bit more now that I have
> > it running on a machine.
> > 
> > Dave.
> 
> That does sound like there is some interaction between DRI3 and these patches.
> I'll see if I can reproduce it.
> 
> Thanks,
> Alex
>