On 01/02/2016 01:20 PM, stan wrote:
On Sat, 2 Jan 2016 16:58:35 +0000 (UTC)
Beartooth <beartooth@xxxxxxxxxxx> 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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