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The modifier key count is maintained by the XKB layer and increased/decreased for all modifiers that set state. Test case, MD/SD modifier key count in comment: 1. keyboard 1: press and hold Shift_L # SD:1 MD:1 2. keyboard 2: press and release Shift_L # SD:1,0 MD:1,0 <class copy happens> # SD:1 MD:1 3. keyboard 1: release Shift_L # SD:0 MD:1 4. keyboard 1: press and release Shift_L # SD:1,0 MD:2,1 The modifier is now logically down on the MD but not on keyboard 1 or keyboard 2. XKB is layered in before the DIX, it increases/decreases the modifier key count accordingly. In the above example, during (2), the MD gets the key release and thus clears the modifier bit. (3) doesn't forward the release to the MD because it is already cleared. The copy of modifierKeysDown when the lastSlave changes however increases the counter for the held key. On (4), the press and release are both forwarded to the MD, causing a offset by 1 and thus do not clear the logical modifier state. X.Org Bug 25480 <http://bugs.freedesktop.org/show_bug.cgi?id=25480> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Acked-by: Daniel Stone <daniel@fooishbar.org>
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
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