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Consider below sequence - 1) Cursor is removed : isUp will be FALSE if HW cursor is set. 2) VT switched away from X : vtSema becomes FALSE. 3) xf86CursorSetCursor is called with non-null CursorPtr : Saves the passed in CursorPtr, fallbacks to SW cursor and invokes spriteFuncs->SetCursor which saves the area under cursor and restores the cursor. This sets isUp to TRUE and as vtSema is FALSE saved data is garbage. 4) VT switched to X : vtSema becomes TRUE. xf86Cursor enable fb access is called which will remove the SW cursor, i.e copies saved data in #3 to screen. This results to momentary garbage data on screen. Hence when !vtSema skip spriteFuncs->SetCursor. X.Org Bug 85313 <https://bugs.freedesktop.org/show_bug.cgi?id=85313> Signed-off-by: Yogish Kulkarni <yogishk@nvidia.com> Reviewed-by: Adam Jackson <ajax@redhat.com> Signed-off-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
Xorg mailing list:
http://lists.freedesktop.org/mailman/listinfo/xorg
Please submit bug reports to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/xserver
http://cgit.freedesktop.org/xorg/xserver
For patch submission instructions, see:
http://www.x.org/wiki/Development/Documentation/SubmittingPatches
For more information on the git code manager, see:
http://wiki.x.org/wiki/GitPage