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4e12d7b6f4
In the new KMS APIs, the legacy drmModeSetCursor ioctl actually waits for a vblank after changing the cursor image before returning, meaning that the X server, in attempting to hide the cursor before updating its image, actually makes that hide *visible* for a full vblank. It's unknown why the X server does this by default, but turn it off. If we're with a legacy driver that doesn't support the modern drmModeSetCursor by waiting for a vblank before returning, we're going to get a tiny bit of tearing on the cursor plane. But between tearing with a new cursor image and tearing with a blank cursor image, I'd rather the former. The only proper solution to this is an atomic ioctl that page flips all planes, including the cursor plane, at vblank time and at the same time. Signed-off-by: Keith Packard <keithp@keithp.com> Reviewed-by: Keith Packard <keithp@keithp.com>
X Server
The X server accepts requests from client applications to create windows,
which are (normally rectangular) "virtual screens" that the client program
can draw into.
Windows are then composed on the actual screen by the X server
(or by a separate composite manager) as directed by the window manager,
which usually communicates with the user via graphical controls such as buttons
and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the
following article:
http://en.wikipedia.org/wiki/X_server
All questions regarding this software should be directed at the
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http://cgit.freedesktop.org/xorg/xserver
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