[Intel-gfx] [PATCH] Xv: free tearing on textured video

Keith Packard keithp at keithp.com
Wed Feb 25 17:30:19 CET 2009

On Wed, 2009-02-25 at 15:56 +0800, Zou, Nanhai wrote:

> I suggest turn this option default to be true or not use an option at all.
> We already have too many options to handle.

Ideally, this code would do the right thing automatically, and be
configured when it 'automatic' wasn't working right. Nanhai's suggestion
of turning it on by default is a good one, as is Dave's suggestion of
using an Xv attribute instead of a config file option. 

I'd suggest one further change -- only sync when the video is 'large',
so that videos which are only a small part of the screen don't impact
other applications running at the same time. 

How about an Xv attribute which has three values 'on' 'off' and 'auto'?
'on' means always sync, no matter what size, 'off' means never sync and
'auto' means sync if the Xv image is more than half(?) of the pixels on
the screen. Then we set the default to 'auto'. Users can adjust the
behaviour of the driver using 'xvattr'.

One problem with this plan is that 'xvattr' adjusts the attributes on a
single port, and as we offer 16 textured video ports (along with 1
overlay port on hardware with an overlay), the user would need to call
xvattr up to 17 times to effect the change uniformly. I'd say we should
just fix 'xvattr' to add a '-p all' option to adjust a parameter for all

keith.packard at intel.com
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