upgrading & display problem

[Chris Rouch]

On Sat, Jun 20, 2009 at 6:02 PM, Beartooth TpBkR<beartooth at comcast.net> wrote:
> On Fri, 19 Jun 2009 14:42:01 -0700, Konstantin Svist wrote:
>
>> Beartooth TpBkR wrote:
>        [...]
>>>      I think I'm going to have to shut everything down, take the
>>> problem machine off the switch, and re-tinker with all three
>>> peripherals connected directly to it -- the way I quit having to do
>>> installs and upgrades three or four releases ago.
>>>
>>>      Is there a less tedious way??
>>>
>> Problem is that KVM switches emulate monitor keyboard and mouse to the
>> computers. This is because default BIOS settings prevent the computer
>> from booting if the keyboard/monitor aren't present
>
>        What is odd is that throughout the last two or three Fedora
> releases, if not longer, these upgrades have succeeded with the KVM
> switch in place.
>
>> -- and ps/2 mouse
>> connectors are generally sucky and don't accept a mouse if it was
>> plugged in after the computer booted (could be a winderz problem,
>> actually...).
>
>        Everything has been USB rather than PS/2 for a year or three.
>
>> Anyway, your KVM switch tells your machine that the monitor resolution
>> is 1400x1050 and F11 happily obeys (thinking the resolution info is
>> real).
>
>        That certainly sounds right; but why is it only doing it now,
> after having refrained during previous upgrades??
>
>> Setting it to 1680x1050 (only, no other resolutions!) in xorg.conf
>> should normally make it work. You'll need to restart X -- and for that,
>> you may need to reboot the machine. If you can't reboot, you can change
>> runlevel to 3 and then back to 5:
>> # init 3
>> [... wait a little for console to settle down ...] # init 5
>
>        Went there, did that -- some days ago. No joy.
> --

You could try adding

Option "NoDDC"

to the devices section of the xorg.conf. This fixed a similar problem
we had with RHEL5 and a dell kvm.

Regards,

Chris