On Mo, 2014-03-24 at 09:36 +0000, Dr. David Alan Gilbert wrote: > * Gerd Hoffmann (kra...@redhat.com) wrote: > > 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). > > Oh dear, that's a shame to use a field like that for a single bit of info.
Indeed. Patch sent to systemd-devel to get that fixed. Matching by serial number certainly makes sense. EDID emulation / pass-through has been discussed before, so we might get that some day. Also for virtio-gpu (which is the most important case) we have the option to simply pass on serial numbers without the edid, maybe in virtgpu_display_info. cheers, Gerd
