[iyonix-support] Re: Opps, res out of range

  • From: Chris Evans <chris@xxxxxxxxxxxxxxx>
  • To: iyonix-support@xxxxxxxxxxxxx
  • Date: Mon, 21 Jan 2008 12:41:08 +0000 (GMT)

On Mon 21 Jan, John Ballance wrote:
> 
> 
> 
> Paul Vigay wrote:
> > In a dim and distant universe <183d9a644f.wra1th@xxxxxxxxxxxxxxx>,
> >    Gavin Wraith <gavin@xxxxxxxxxxxxxxx> enlightened us thusly:
> >> Do modern LCD monitors actually _need_ MDFs? My impression is that they
> >> tend to come with inbuilt optimum settings; is that right? Are these
> >> settings transmitted to the computer?
> > 
> > Yes. I'd have said they were more critical, as often a CRT will display a
> > picture, even if it's not got the exact settings, whereas an LCD will just
> > display "Out of range" or somesuch error message and shut down.
> 
> As far as LCDs are concerned, the BEST performance will ONLY be achieved 
> if optimal mdf settings are used.
> 
> Here at Iyonix we have a tool we use that creates an MDF by reading the 
> settings from the monitor itself. All displays from us will come 
> therefore with appropriate MDFs.

We have seen quite a few LCD that give blatantly incorrect information [1]
and others with more subtle inconsistancies including specs that are
impossible to be read by EDID i.e. an Iiyama LCD that has different
refreshrate requirements dependant on what the resolution was, something
that is impossible for EDID to do, as refreshrate range is a single all
resolutions value.

We also recently found one model that a later delivery required a modified
MDF!

[1]Incorrect model and size!
 
> This capability is not so far built into the OS.. in other OS es this 
> does happen behind scenes (Plug - n - Pray operation) .. for the future???

The bottem line is that unless the monitor comes with an MDF you may have
hassle getting a suitable MDF. Many/most people may have no problem but you
may!

Chris Evans

-- 
CJE Micro's / 4D                'RISC OS Specialists'
Telephone: 01903 523222             Fax: 01903 523679
chris@xxxxxxxxxxxxxxx     http://www.cjemicros.co.uk/
78 Brighton Road, Worthing, West Sussex,     BN11 2EN
The most beautiful thing anyone can wear, is a smile!


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