As I have been using the same setup for several years I'm afraid I
completely forgot to mention something potentially significant.

I have two computers which are both connected to a KVM switch.  When I
boot them up my Windows (music production) box is connected to the first
KVM connection, and my Ubuntu machine is connected to the second
connection).   When the first machine is powered on the KVM "wakes up"
and defaults to using connection 1 and I then manually switch to machine
2 when I wish to use it.

As I said in my original bug report since I manually edited xorg.conf
(probably back at about 5.04) X has worked perfectly on this system.  It
has only been broken since Gutsy.

Following investigations it would appear that when the Ubuntu box is
powered up with the focus on KVM connection 2 it starts X using a
refresh rate of 76 Hz (instead of 85 Hz)   However when it is powered up
either with the monitor powered off or with the "KVM focus" on
connection 1 (the Windows machine) X is started using a refresh rate of
50hz (which to all intents and purposes makes the monitor unusable - it
feels like it's strobing)

After further investigation I have also been able to get a second system
not to detect the it's monitor properly by not having the monitor
switched on during boot up.  In this case its my crappy old 200Mhz
machine which is currently attached to a dying 15" monitor.  If I start
the machine with the monitor connected it gets [EMAIL PROTECTED] whereas with
the monitor attached it gets a more usable [EMAIL PROTECTED]  Admittedly
though this system is very old and the monitor is on its last legs
anyway (vertical hold intermittently gives up) so this might not be a
valid test.

Even so this tends to suggest that when X is starting it is probing the
monitor and is ignoring the values set up in xorg.conf.

I would suggest this is incorrect behaviour.  The  X server should use
the values in xorg conf and should only attempt to autodetect monitor
characteristics either:

1  During initial install or

2  When the user requests it (either via the "Screen Resolution"
dialogue, when the "Ctrl+Alt+Backspace" X server "panic" keys have been
pressed etc.)

Once xorg.conf is set up properly the X server should respect the values
entered in there (especially if they have been hand edited)

Currently getting a 50Hz refresh rate on my monitor has made my Ubuntu
desktop unusable so it is now basically only ever powered up once a week
(or so) to run Update Manager in the vain hope that this will have been
fixed.  Having become used to using it on a daily basis this is
dissapointing to say the least.

Still, thanks to Samba it  at least it makes a good file server :)

-- 
Cannot set correct monitor resolution for Iiyama Vision Master Pro 455 using 
displayconfig-gtk 
https://bugs.launchpad.net/bugs/158002
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