[Intel-gfx] [PATCH] Make DGA optional

[Keith Packard]

On Tue, 2009-09-15 at 15:14 +0800, Zhenyu Wang wrote:

> As DGA is optional in xserver, revert that one might crash X in start.
> Or we just fake to init DGA proto, not sure if there's any DGA callbacks
> that driver can use for framebuffer open later?

DGA isn't really optional; you'd have to recompile the X server to
disable it. And, as we know, many applications depend on it (but only
for input).

> DGA did not work correctly in KMS before, but some close-source games were
> still working makes me think they might just check if DGA proto exists...

The only thing these games use DGA for is to get relative mouse motion;
they don't use it for drawing (at least, very few use it for drawing
anymore). Those requests never come near our driver.

-keith

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