Re: [Mesa3d-dev] [PATCH] invalidate dri2 buffers more often/pageflip related screen flickering

[Jesse B. <jb...@vi...>]

On Sat,  8 Jan 2011 16:02:09 +0100
Daniel Vetter <dan...@ff...> wrote:

> Hi all,
> 
> I've been tracking down an annoying flickering problem on intel hw
> that completely disappears with vblank_mode=0. Some add-hoc tracing
> all over the stack shows that the pageflip and the render stalling on
> the new backbuffer all happen correctly. But rendering always happens
> to the _same_ buffer, with the obvious effects of garbage (often just
> black) on every second frame and flickering on the other frames due
> to frontbuffer rendering.
> 
> Attached is the minimal (and likely incorrect) patch that fixes this
> for me.
> 
> Software stack: Everything latest git, safe for the X server, that's
> 1.9.3 as provided by Fedora 14. Problem also exists on 1.9.2 from
> debian experimental.  Problem reproducible on all my intel hw,
> irrespective of DE and composition manager.
> 
> Some enlightenment preferably in the form of a proper fix highly
> appreciated ;)

I've seen this too, but last time it was due to me building with old
dri2proto and/or glproto, so Mesa and the server weren't doing the
right thing...