[Intel-gfx] [PATCH CI 1/2] drm/i915/display/skl+: Drop frontbuffer rendering support

[Ville Syrjälä]

On Thu, Sep 09, 2021 at 08:23:20PM +0000, Souza, Jose wrote:
> On Thu, 2021-09-09 at 23:20 +0300, Ville Syrjälä wrote:
> > On Thu, Sep 09, 2021 at 12:49:16PM -0700, José Roberto de Souza wrote:
> > > By now all the userspace applications should have migrated to atomic
> > > or at least be calling DRM_IOCTL_MODE_DIRTYFB.
> > > 
> > > With that we can kill frontbuffer rendering support in i915 for
> > > modern platforms.
> > > 
> > > So here converting legacy APIs into atomic commits so it can be
> > > properly handled by driver i915.
> > > 
> > > Several IGT tests will fail with this changes, because some tests
> > > were stressing those frontbuffer rendering scenarios that no userspace
> > > should be using by now, fixes to IGT should be sent soon.
> > > 
> > 
> > I just gave this a try here and it's unusable. glxgears went from
> > 9000 to 120 fps (was expecting 60fps tbh, not sure why I get
> > double), everything lags like mad, if I drag a window around
> > glxgears/other windows stop updating entirely, etc. NAK
> 
> Can you share your setup? What GPU? Desktop environment? Mesa version? resolutions of sinks?
> Will try it in my end.

Doesn't really matter as long as you don't have a compositor making a
mess of things. This machine is a cfl running mate w/ compositor off,
and some 1920x1200 display.

-- 
Ville Syrjälä
Intel