xdm receives no input

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

Had a go with the shiny new X (thanks!) on the sandy bridge laptop
which no longer likes SNA but works with UX, and xdm seems to sit
at the prompt waiting for something:

#0  0x00007f7ff344285a in poll () from /usr/lib/libc.so.12
#1  0x00007f7ff6031f3d in IoWait (wt=0x7f7fffffcec0, wf=<synthetic pointer>, 
    wf=<synthetic pointer>)
    at /usr/xsrc/external/mit/libXt/dist/src/NextEvent.c:356
#2  _XtWaitForSomething (app=app@entry=0x7f7ff7e60000, 
    ignoreEvents=ignoreEvents@entry=0 '\000', 
    ignoreTimers=ignoreTimers@entry=0 '\000', 
    ignoreInputs=ignoreInputs@entry=0 '\000', 
    ignoreSignals=ignoreSignals@entry=0 '\000', block=block@entry=1 '\001', 
    drop_lock=0 '\000', drop_lock@entry=1 '\001', howlong=howlong@entry=0x0)
    at /usr/xsrc/external/mit/libXt/dist/src/NextEvent.c:624

The cursor is visible in the Login: prompt, but apparently Something never
happens... (Switching to SNA, doesn't change anything.)

Thoughts on how to debug?


Cheers,

Patrick