gmane.org.user-groups.linux.cplug.general

Experience with odd KVM behavior?

Has anyone had this issue before?

I have a server that will show a display with some KVMs, but not others.
It works with an older Avocent KVM rebranded for Dell, but will not work
with a Belkin, Linksys or newer Avocent KVM. So far as I can tell, it is
not a cable issue.

Does anyone have any suggestions?

Best Regards,
Dennis Little

--
Is your résumé getting results?
http://www.centralpennbusiness.com/blog.asp?pid=1314

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Dennis Little | 1 Jul 21:22

Re: Experience with odd KVM behavior?


On Tue, July 1, 2008 3:18 pm, Dennis Little wrote:
> Has anyone had this issue before?
>

I should also clarify that I do not see anything from boot (not even
POST). The monitor goes to standby as if receiving no signal. This happens
on all but 1 KVM I have tried.

Thanks,
Dennis

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Stephen Rees | 1 Jul 21:29

Re: Experience with odd KVM behavior?

I've seen it before, but never explored to find out why. I just used the
KVM that worked... :) I think our issue was more with daisy-chaining
unmatched KVMs.

On Tue, 2008-07-01 at 15:22 -0400, Dennis Little wrote:
> 
> On Tue, July 1, 2008 3:18 pm, Dennis Little wrote:
> > Has anyone had this issue before?
> >
> 
> I should also clarify that I do not see anything from boot (not even
> POST). The monitor goes to standby as if receiving no signal. This happens
> on all but 1 KVM I have tried.
> 
> Thanks,
> Dennis
> 
> 
> 
> 
> 
> _______________________________________________
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Bob K Mertz | 1 Jul 21:33

Re: Experience with odd KVM behavior?

Ive been dealing with some really odd KVM stuff recently.  I know that  
for one thing there are some servers that have a video card that puts  
out a much higher refresh rate and/or resolution even during POST.  In  
these cases I have monitors that just simply don't turn on because  
they can't handle the resolution.  The same can also be true for KVMs  
and the only reason why I know this is the case with these servers is  
because our IPKVM unit displays the screen much larger than the screen  
on my laptop for these servers while 95% of the servers display  
normally.  It could also be related to what type of cable connection  
the KVM is using.  A lot of KVMs are now putting keyboard/mouse/vga  
all within a single HD15 connection.  I've personally never seen any  
issues with that but its possible if the video card in the server uses  
an antiquated sync code of some sort.

On Jul 1, 2008, at 3:29 PM, Stephen Rees wrote:

> I've seen it before, but never explored to find out why. I just used  
> the
> KVM that worked... :) I think our issue was more with daisy-chaining
> unmatched KVMs.
>
> On Tue, 2008-07-01 at 15:22 -0400, Dennis Little wrote:
>>
>> On Tue, July 1, 2008 3:18 pm, Dennis Little wrote:
>>> Has anyone had this issue before?
>>>
>>
>> I should also clarify that I do not see anything from boot (not even
>> POST). The monitor goes to standby as if receiving no signal. This  
>> happens

(Continue reading)

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Dennis Little | 1 Jul 21:47

Re: Experience with odd KVM behavior?


On Tue, July 1, 2008 3:33 pm, Bob K Mertz wrote:
> Ive been dealing with some really odd KVM stuff recently.  I know that

Thanks for the response guys. I think that I may have found my answer in
the very last post on this page:

http://www.techsupportforum.com/hardware-support/video-card-support/134855-no-display-kvm.html

The KVM that works with this particular server has DDC-2B listed in its
specs (a Dell 2160AS). I can not seem to find that standard compliance
listed for our much newer Avocent or any of the other (cheaper) KVMs that
this server does not work with. Note that I am not ragging on Avocent -
they list other models in the AutoView series that support DDC.

I have never run into this before, but I guess I might have to add DDC
compliance to my list of requirements when shopping KVMs for production
environments.

-Dennis