[wellylug] Resolution outside of range

Rob van der Linde robvdl at gmail.com
Mon Oct 20 20:36:47 NZDT 2008


http://www.linuxquestions.org/questions/mandriva-30/eyes-in-pain-very-low-screen-refresh-rate-with-mandriva-2008-613570/

... looks like the new option for disabling EDID is now:

Option "UseEdidFreqs" "false"

At least that sounds familiar.

On Mon, 2008-10-20 at 20:24 +1300, Rob van der Linde wrote:
> I have a friend who has a monitor that is using 4x BNC connectors,
> however the problem with this is that the monitor is not sending EDID
> information to the PC about what res and refresh it can handle. This
> causes it to set 640x480 as the default mode and you can't go beyond
> that. I have also have had the odd monitor that gives incorrect EDID
> information in the past, either that or X misinterpreted this
> information, causing the exact thing you are experiencing where a mode
> or refresh raye is set beyond the monitors limitations.  Turning off the
> check for EDID, then setting a manual min and max frequency and min and
> max refresh rate fixes this issue.
> 
> What you need to do is:
> 
>  - Disable EDID frequency check in xorg.conf
>  - Tell X your max and min refresh rates.
>  - Tell X your max and min horizontal sync.
> 
> I do not currently have access to this friends machine to check the X
> configuration file, so you will have to Google on this subject. You
> should have a section in your xorg.conf file for your monitor, since the
> latest X is mostly autodetect, the block is likely to be mostly empty.
> 
> I do know off the top of my head what to use for the min and max refresh
> and horizontal sync:
> 
> HorizSync  30-96
> VertRefresh 50-160
> 
> But replace those numbers with the specs for your monitor, you might
> need to Google this. However, X will not set these values unless you
> tell X to also ignore EDID frequency info. Now if you Google on this
> subject, please be aware that a few years ago they slightly changed the
> name of this option, so there will be pages giving you the old way and
> the new way. The old way no longer works (I think it was Option
> "IgnoreEDID" "true"). If you try the old way, then check the X log file,
> there should be a hint in there what to use instead.
> 
> I think as I recall, the IgnoreEDID option was split into various
> options, the option you want to set, I think was to just ignore EDID
> frequencies, something like IngoreEDIDFreqs?? but Google this info, as I
> am not 100% sure what this option was called.
> 
> On Sun, 2008-10-19 at 14:17 +1300, Ray Smith wrote:
> > Hi all,
> > I changed my desktop resolution in Ubuntu 8.04. It worked fine until I
> > enabled the ATI graphics driver. Now when the computer boots I get a
> > blank monitor screen with a "Resolution out of range" error message. I
> > cannot get back to my desktop. How can I change the resolution back to
> > what it was before?
> > Thanks,
> > Ray
> > 
> > -- 
> > Ray Smith
> > Masterton
> > New Zealand
> > 
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