[mythtv-users] OT - aspect ratio and non-square pixel display

[Jeremy Jones]

On Mon, May 20, 2013 at 5:06 PM, Jeremy Jones
<jeremy.dwain.jones at gmail.com>wrote:

>
>
> On Mon, May 20, 2013 at 2:50 PM, HP-mini <blm-ubunet at slingshot.co.nz>wrote:
>
>> The latest nVidia driver series has returned the over/underscan GUI
>> tool.
>> For the previous you had to use viewportin/out..
>>
>> To override the DPI from EDID (if any):
>> /etc/X11/xorg.conf
>> Section "Monitor"
>>    Identifier   "Monitor1"
>>    <snip>
>>    UseModes      "myHDTV"
>>    DisplaySize   650   366
>> EndSection
>>
>
> This much I had.
>
>
>>
>> Section  "Screen"
>>    <snip>
>>    Monitor   "Monitor1"
>>    Option    "UseEDIDDpi"  "False"
>>    Option    "ConstantDPI"   "False"
>>
>
> That part I did not have.
>
>
>
>> EndSection
>>
>> EOF
>>
>> FWIU If the Option "DPI"  "string" is used. it ignores the displaysize.
>>
>>
> That option is not in my xorg.conf file. (may be put in by another means)
>
>
>> The display size is normally calculated from DPI & native pixel size.
>> xdpyinfo | grep -B1 dot
>>
>> You could post a link to copy of /var/log/Xorg.0.log file..
>>
>>
> I'll try adding the DPI FALSE options you listed above when I get home and
> see if that takes care of it.
>

I tried adding the lines above to xorg.conf and it did not help.  After
some googling and some searching of the files in my system (reading startup
scripts, etc) I think that xrandr may be the culprit.  It seems to be
forcing square DPI.  I found a setting  using xrandr from terminal that
will change this and all works well until reboot.  Adding the command to a
script and running it at logon, does not seem to work however.  I think it
has to do with the timing of the scripts that are running.

Since I have a fix that works for the current session, and since reboots
are very infrequent (mythfrontend only box), I just added the xrandr
command to the mythfrontend startup script. Then when there is a reboot and
my wife/kids press the button on the remote to start mythfronted, the
xrandr command runs first.

I know this is an ugly solution, but it works for me and this TV will
probably not last that much longer anyway.  Thanks to those that helped.

Jeremy
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