[Spice-devel] [RFC/POC PATCH 00/16] add output_id to monitors_config

[Christophe Fergeau]

On Tue, Jun 19, 2018 at 08:11:25AM -0400, Frediano Ziglio wrote:
> I'm relative new in this group (3 years) compared to these stuff,
> some are possibly not in current git repos, but I think that more or
> less the history is:
> - before multimonitor. No much issues the monitor was the monitor;
> - start adding multi monitor support, only one device was used. The
>   problem was only sending the ID of the monitor which was 0, 1, ...
>   Added a monitor_config message in the SPICE protocol from server
>   to client. The client could resize the monitors sending a message
>   to the agent through the server, server was not involved. As there
>   was only a QXL device and no other devices there was no reason to send
>   information for channel/qxl device and monitor IDs matched Xrandr IDs;
>
> - for some reasons on Windows was not great, somebody decided to use
>   multiple QXL devices each with one monitor.

I believe this is how Windows used to do multimonitor in the winxp/win2k
era, it expected to see one pci device per physical display.
spice used to handle multimonitor on linux this way too with
xinerama.

Christophe
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