Tearing video on Sandy Bridge

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On 05/03/2012 03:51 PM, tino.keitel+xorg at tikei.de wrote:
> On Thu, May 03, 2012 at 21:46:37 +0200, Daniel Vetter wrote:
>> On Thu, May 03, 2012 at 09:34:28PM +0200, Tino Keitel wrote:
>>> On Thu, May 03, 2012 at 20:43:01 +0200, Daniel Vetter wrote:
>>>
>>> [...]
>>>
>>>> The only way to get tear-free screen updates on snb is with pageflips,
>>>> which requires a opengl compositor
>>>
>>> Thanks. What do you mean with "opengl compositor"? Isn't the Gnome3
>>> desktop providing this?
>>
>> Well, it needs to do vsync'ed updates, and to work correctly, the client
>
> Is this in the dri config file?

I've had tear-free video (finally!) in GNOME 3 for a while now, using 
the following in my ~/.xsession (and launching that from GDM instead of 
GNOME directly):

CLUTTER_PAINT=disable-clipped-redraws:disable-culling 
/etc/X11/Sessions/Gnome

You may have to adjust the "/etc/X11/Sessions/Gnome" depending on your 
distribution (I'm on Gentoo).

Hope that helps,

Chun-Yu


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