5c7af02b10
A single provider can be both a offload and source slave at the same time, the use of seperate lists breaks in this case e.g. : xrandr --listproviders Providers: number : 2 Provider 0: id: 0x7b cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 2 associated providers: 0 name:modesetting Provider 1: id: 0x46 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 5 associated providers: 0 name:modesetting xrandr --setprovideroutputsource 1 0x7b xrandr --listproviders Providers: number : 2 Provider 0: id: 0x7b cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 2 associated providers: 1 name:modesetting Provider 1: id: 0x46 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 5 associated providers: 1 name:modesetting xrandr --setprovideroffloadsink 1 0x7b xrandr --listproviders Providers: number : 3 Provider 0: id: 0x7b cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 2 associated providers: 2 name:modesetting Provider 1: id: 0x46 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 5 associated providers: 2 name:modesetting Provider 2: id: 0x46 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 2 outputs: 5 associated providers: 2 name:modesetting Not good. The problem is that the provider with id 0x46 now is on both the output_slave_list and the offload_slave_list of the master screen. This commit fixes this by unifying all 3 lists into a single slaves list. Note that this does change the struct _Screen definition, so this is an ABI break. I do not expect any of the drivers to actually use the removed / changed fields so a recompile should suffice. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Dave Airlie <airlied@redhat.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
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