Bug#555647: x11-xserver-utils: xrandr -o left leaves xdm, after I logout, unresponsive, with no login prompt

[Edward Welbourne <eddy@opera.com>]

> I use xrandr -o left in my .xsession so that I can use my screen in
> portrait mode.

I'm now achieving the equivalent effect by adding
Option		"Rotate" "left"
to Section "Monitor" of my /etc/X11/xorg.conf
(which avoids the font problems I had with xrandr -o left)
and now find that xdm always hangs after I log out (where, previously,
it only used to hang if I ran xrandr -o -left in my user session).

When the X session is hanging, after I've logged out, I find that
/etc/init.d/xdm stop
fails, claiming that the xdm.pid file doesn't exist, even though ps
reports that the xdm process is still running.

I notice that xmd has two child processes:

USER       PID  PPID    SZ    VSZ   RSZ  NI CMD
root     17331     1  1399   5596   940   0 /usr/bin/xdm
root     20618 17331  6763  27052 15008   0 /usr/bin/X :0 vt7 -nolisten tcp -auth /var/lib/xdm/authdir/authfiles/A:0-chlHyX
root     20622 17331  2104   8416  5236   0 -:0         

When logging out has hung the X session, killing the last (which has a
symlink to /usr/bin/xdm as its /proc/20622/exe) causes xdm to exit;
whereas killing the /usr/bin/X process persuades the xdm process to
start a new X login prompt, which works as usual.

	Eddy.