On Tue, 2007-03-06 at 11:07 +0100, Michel Dänzer wrote:
> This functionality has been available on branches i915-pageflip (drm),
> i830-pageflip (xf86-video-intel) and i915tex-pageflip (mesa) for two
> weeks. In order to be able to use page flipping independently on each
> pipe, the X server DRI module changes from the xserver master branch are
> also needed.
> 
> I developed and tested this on i945 hardware. I've had reports of it
> working on i915 as well but would be interested in hearing whether it
> works on i830 and above.
> 
> The only significant outstanding issue I'm aware of is that moving a
> page-flipped 3D window from being visible on pipe A only to being
> visible on pipes A+B can result in a lockup if the flips on pipe B are
> emitted 'too quickly'. I'm currently avoiding this by not syncing the
> pages between pipes immediately in that situation, so it only seems to
> happen with insane framerates such as glxgears', but this could probably
> cause issues of its own with apps that render to the front buffer. It
> doesn't seem to happen when moving from pipe B to pipes A+B, and the
> command stream always waits for previous asynchronous flips to complete
> before emitting a new flip, so I'm not sure what's up. Any ideas would
> be appreciated, especially from the Intel folks.
> 
> Possibly related to this, it's been reported that there can be issues
> with outputs that aren't handled quite correctly by the modesetting
> driver (yet), e.g. LVDS on desktop boards. If you have issues with page
> flipping and xrandr 1.2 shows outputs that shouldn't be there, try
> disabling them.

Even better, file a bug with Xorg.0.log and the output of scanpci from
libpciaccess, and we can blacklist the LVDS on your board hopefully.

> If there are no objections, I'd like to merge these branches to the
> respective master branches by the end of this week. Of course, if the
> issues above can't be solved before the merge, I'll document them in the
> intel.4 manpage.

-- 
Eric Anholt                             [EMAIL PROTECTED]
[EMAIL PROTECTED]                         [EMAIL PROTECTED]

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