Why EDID is not trustworthy for DPI

Adam Williamson awilliam at redhat.com
Wed Oct 5 20:17:27 UTC 2011

On Wed, 2011-10-05 at 15:56 -0400, Simo Sorce wrote:

> > > Are you saying fonts should change on the fly when I move an app between
> > > 2 monitors that have different DPIs ?
> > 
> > If they're sufficiently different in DPI, sure. Or would you really want
> > everything to suddenly become twice as small if you were moving a window
> > from a 100dpi monitor to a 200dpi one?
> Are you also proposing to automatically resize all windows when you move
> them from one display to another ? There lies the road to disaster an
> pain imo.
> At least untill all rendering is done with something like svg and not
> with absolute pixel values this is just going to be a very bad
> experience.

I'm more trying to think ahead about what's going to happen when our
current convenient assumptions break down than making specific technical
proposals. It just doesn't seem to me like a winning strategy to keep
working on the basis that we can simply assume one notional DPI for all
displays; sooner or later, given where display technology is going, this
is likely to break down. (Unless we just go with what happened when we
switched from 72dpi to 96dpi, I guess: wait until some arbitrary
'tipping point' in the adoption of hi-res displays and then say 'okay,
new notional dpi is 200, get used to it'. But there may be too long of
an overlap period for that to be practical.)
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | identi.ca: adamwfedora

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