Bug#169427: When the default mouse is gone, X should still work

[Marques Johansson <marques@displague.com>]

Package: xserver-xfree86
Version: 4.3.0.dfsg.1-5
Followup-For: Bug #169427

I stumbled upon this bug on my laptop which has a builtin ps/2 mouse.  After doing an upgrade /dev/psaux went away.  This caused X not to load at the next boot and for whatever reason gdm wouldn't pass control onto the next rc file.

X has the configuration allowing for a secondary mouse in /dev/input/mice. this allows for (2.6) ps2 mice and usb mice to work well under a default X config.  However, the lack of the 'Option "AllowMouseOpenFail" "true"' causes X to not load when it otherwise would have loaded happily.

What harm could be done in changing the default debian XF86Config-4 to include this line?  In a worst case, someone with an improper mouse configuration gets keyboard-only access to X.