Bug#406457: Me too

[Tim Day]

Just saw this myself.
Standard etch install (upgraded from sarge), 2.6.18-5-686 kernel, gdm.
I added 
  console=ttyS0,9600n8
and later
  console=tty0 console=ttyS0,9600n8
to the boot options in the hope of getting some info to diagnose an
infrequent system freeze.  In both cases, When gdm came up after the
reboot it was unresponsive to keyboard input (mouse fine) until either I
- ssh-ed into the machine and restarted gdm
or
- used the mouse to click to the XDMCP chooser (which was observed to
respond to keyboard) then cancel back to the login prompt (which then
accepted keyboard).