[mythtv-users] Strange resolution problem

[Saul]

On Sun, 05 Jul 2015 01:32:39 +1200
Stephen Worthington <stephen_agent at jsw.gen.nz> wrote:

> On Sat, 4 Jul 2015 06:25:11 -0500, you wrote:
> 
> >On Sat, 04 Jul 2015 11:31:00 +0100
> >Damian <myth at surr.co.uk> wrote:
> >
> >> On 04/07/2015 08:29, Alec Leamas wrote:
> >> > On 04/07/15 08:57, Andréas Kühne wrote:
> >> >> What I would do is check the EDID properties of the projector,
> >> >> also perhaps change the settings in mythbuntu to not care about
> >> >> the EDID values. I don't know how to do that however.
> >> >
> >> > I did this long time ago for a monitor with a long cable, long
> >> > enough to make EDID fail. The solution was to add a modeline to
> >> > xorg.conf, in my case it looks like this (mind the email
> >> > linebreaks). It still works.
> >> >
> >> > Section "Monitor"
> >> >     Identifier     "Monitor0"
> >> >     VendorName     "IBM"
> >> >     ModelName      "ThinkVision L190"
> >> >     HorizSync       15.0 - 70.0
> >> >     VertRefresh     58.0 - 64.0
> >> >     ModeLine     "1280x1024_60.00" 108.9 1280 1360 1496 1712 1024
> >> > 1025 1028 1060 -hsync +vsync
> >> >     Option         "DPMS"
> >> > EndSection
> >> 
> >> Thanks Alec and Andréas. That certainly seems worth a try!
> >> 
> >> I don't seem to have a xorg.conf file, but I assume the OS will use
> >> one if it finds one.
> >> 
> >> So, now for the million dollar question ...
> >> 
> >> How do I know the right settings for a xorg.conf entry for my BenQ
> >> W1300 projector at 1920x1080? Those HorizSync, VertRefresh,
> >> ModeLine and Option settings look like things that you don't want
> >> to get wrong!!
> >
> >There are modeline calculators, online and probably in Ubuntu
> >Software Center.
> 
> When the projector is in the right mode, try running
> 
>   xrandr -q --verbose
> 
> from a terminal window.  That gives you a lot (all?) of the data you
> need for a modeline.  The output on my system includes a dump of my
> TV's EDID data, which is just effectively a set of modelines to use
> with the TV.  It is possible with nvidia-settings to dump the EDID
> data to a file, then change xorg.conf so that it uses that file
> instead of the data over the HDMI or DVI cable (which my possibly be
> being read unreliably).  Then set up xorg.conf to lock the display
> mode to the modeline (or modelines) in the EDID data that you want the
> projector to use.

If EDID is read unreliably how xrandr can get it? :)

However, there is get-edid
http://manpages.ubuntu.com/manpages/hardy/man1/get-edid.1.html

Holy macro, I even didn't know Forte Agent is still alive!

-- 
Cheers, Saul