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Message-ID: <1395650203.15484.29.camel@nilsson.home.kraxel.org>
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 24 Mar 2014 09:36:43 +0100
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Subject: Re: [Qemu-devel] multihead & multiseat in qemu
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To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: David Airlie <airlied@redhat.com>, Lennart Poettering <lpoetter@redhat.com>, qemu-devel <qemu-devel@nongnu.org>

  Hi,

> > I'd like to have some way to assign tags such as seat=foo or head=1 to
> > devices.  Preferably in some way which can easily picked up with udev
> > rules, so it is easily usable by system-logind and Xorg server.
> 
> Can't you just do this in the serial number strings for both monitor EDID
> and USB device, I'm assuming that's how current multiseat setups figure
> stuff out.

We don't emulate monitor EDID ...

Also the serial number for HID devices is (ab-)used to signal remote
wakeup support (see commit 7b074a22dab4bdda9864b933f1bc811a3db42845).

> I think with the touchscreen idea that means qemu never needs itself
> to have a view of where it's displays are logically left/right/above/down
> which is probably fortunate.

Yes, that is one of the reasons.

cheers,
  Gerd