10.0-RC4 -> 10.0-RC5: Xorg stopped using /dev/sysmouse

[Jan Henrik Sylvester]

Although the announcement is still pending, I have just upgraded two
machines from 10.0-RC4 to 10.0-RC5. Now my mouse is not working in Xorg
anymore.

Is it necessary to rebuild all ports due to the ABI change in r260406?
Is there a reasonable way to find out, which ports are affected? Is
r260406 related at all?

Some details in case the cause of the problem is not simply using old
packages:

/dev/psm0 and /dev/usm0 are both picked up by moused and still work on
ttyvX (due to moused_enable="YES" and devd_enable="YES" in rc.conf).

Before the upgrade, Xorg would use /dev/sysmouse, but now it tries to
open /dev/psm0 and /dev/usm0 directly, which fails, since they are
already in use.

I thought "Device" "/dev/sysmouse" as "InputDevice" in my xorg.conf was
still relevant, but at least /dev/psm0 and /dev/usm0 are detected by
hald, since they are not listed in xorg.conf.

>From ps, I see hald is still recognizing sysmouse:

hald-addon-mouse-sysmouse: /dev/psm0 (hald-addon-mouse-sy)
hald-addon-mouse-sysmouse: /dev/ums0 (hald-addon-mouse-sy)

All ports related are up to date and have been build WITH_NEW_XORG=yes
but otherwise default options on 10.0-RC3 or 10.0-RC4 (amd64).

Cheers,
Jan Henrik