[mythtv-users] overriding DPI only for myth

[Brian J. Murrell]

On Thu, 2013-11-07 at 09:08 -0500, Michael T. Dean wrote:
> 
> Oh, and don't fool yourself into thinking that the information returned 
> by the display is actually more correct than any measured value.  Many 
> (most?) displays lie to the system, causing DPI to be wrong when derived 
> from EDID-like information.

So, my monitor's physical dimensions are 307x410mm which is
12.09x16.14".  The resolution is 1200x1600.  So I guess the DPI is then
99x99.  Pretty close to 100x100.

NVidia/X reports it as:

[406604.582] (--) NVIDIA(0): DPI set to (74, 131); computed from "UseEdidDpi" X config

I wonder why so wrong.

The secondary monitor is 368x279mm which is 14.5x11" and 1280x1024
pixels.  That's a DPI of 88x93.

NVidia/X reports it as:

[406604.645] (--) NVIDIA(1): DPI set to (90, 96); computed from "UseEdidDpi" X config

Less wrong, but still wrong.

xdpyinfo seems to display some pretty accurate physical measurements
though:

$ xdpyinfo | grep millimeters
  dimensions:    1200x1600 pixels (305x406 millimeters)
  dimensions:    1280x1024 pixels (361x271 millimeters)

So where is X going all wrong?

b.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 490 bytes
Desc: This is a digitally signed message part
URL: <http://www.mythtv.org/pipermail/mythtv-users/attachments/20131107/9ac47e80/attachment.sig>