[mythtv-users] overriding DPI only for myth
Brian J. Murrell
brian at interlinx.bc.ca
Thu Nov 7 14:52:27 UTC 2013
On Thu, 2013-11-07 at 09:32 -0500, Brian J. Murrell wrote:
> 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?
Ahh. At least in the case of the first monitor, which is rotated 90
degrees, X is failing to account for that. I wonder why it's not
accounting for that.
Cheers,
b.
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