Signal out of rangee time

jd1008 jd1008 at gmail.com
Sat Jan 2 20:30:33 UTC 2016



On 01/02/2016 01:20 PM, stan wrote:
> On Sat, 2 Jan 2016 16:58:35 +0000 (UTC)
> Beartooth <beartooth at comcast.net> wrote:
>
>> 	I'm getting an ancient horror message from my old HP w2207h
>> flat panel monitor. I have a KVM switch between it and three
>> different PCs, of which the newest (#1) is running F23, the oldest
>> (#3) F22, and the middle F22 or F23 (I disremember which).
>>
>> 	About the time any of them finishes booting, the HP
>> immediately slaps up a box over the top of the login box, complaining
>> that the signal is out of range, and goes black.
>>
>> 	This monitor used to exercise this perversity when it was
>> new, and it was a real bear (not to say a mother) to correct. If I
>> recall aright, you had to get into xorg.conf somehow, guess the
>> changes it wanted (and where it wanted them), make those changes, and
>> reboot.
>>
>> 	That was years ago, and hasn't xorg.conf bitten the
>> cyber-dust long since? PCs # 1 & 2 have been peacefully running
>> Fedora; I think #3 still has CentOS 6, but will switch to F23 as soon
>> as I can get to it.
> I think the xorg.conf disappeared because monitors were queried for
> their EDID (configuration) information, and X was automatically set to
> that.  Is it possible that the EDID information is not getting through
> or is getting mangled?  What happens if you remove the KVM switch and
> boot with one of the systems directly connected to the monitor?
>
> If it is successful, the EDID information is being mangled by the KVM.
> If I remember correctly, it is possible to capture the EDID information
> of a monitor(I've forgotten the details), and tell X to use that EDID
> information, skipping the read step.  If that is true, then you can
> capture the EDID information from the successful boot, and transfer it
> to all the systems, and no longer have the problem.
>
> If a direct connect boot isn't successful, it might be that the monitor
> is failing, and so isn't sending the proper information.
+1
Most lucid explanation so far.



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