[mythtv-users] Strange resolution problem

[Stephen Worthington]

On Sat, 4 Jul 2015 10:51:26 -0500, you wrote:

>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? :)

That is why I said to run xrandr when the mode was correct, so it
would get the good EDID data (if it is in fact an EDID problem that is
causing the mode changes).

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

I have never used get-edid.  I have used nvidia-settings and I know
that works.  The resulting file can be used with xorg.conf.

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

Of course it is.  V8.0 now.