It seems that the working configuration file attached to Bug 1262093 was not correctly included in the virt-manager update, because the default config for F23 creates a tablet, and so using the mouse doesn't work until that is removed from the hardware profile. Users who actually have a graphics tablet and want to use it with their VM can add one easily enough, but that is surely not the common use case, so shouldn't be the default if it makes the mouse non-functional. virt-manager-1.3.2-1.fc23.noarch Please update the Solaris 10 config to remove the useless tablet.
That info is coming from libosinfo's database. If the tablet doesn't work for solaris10, we need to remove that device ID from the XML
The tablet might work, *if* you have a tablet, I don't know. But with the default settings it prevents a mouse working. It seems better to have a working mouse than a non-working mouse and tablet :-) Not related to this bug, but the Solaris 11 profile simply doesn't work AT ALL. I can't even boot the installation ISO, it crashes almost immediately.
The 'USB Tablet' is not related to any host capability, it's strictly about emulating a tablet for the VM, which typically gives much better mouse tracking. As for solaris 11, yeah I tried to get it working once as well but I couldn't. It could be a settings issue, or a qemu/kvm bug, or a solaris but that's exposed by virt emulation, hard to say.
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FWIW I tried a solaris10 install + login. With virt-manager adding a USB tablet mouse worked fine for me. Maybe some bug fixed in the intervening time.