Why EDID is not trustworthy for DPI

Casey Dahlin cdahlin at redhat.com
Tue Oct 4 20:24:53 UTC 2011

On Tue, Oct 04, 2011 at 04:17:08PM -0400, Martin Langhoff wrote:
> For fedora users, as others have mentioned, perhaps a UI that lets
> users test a couple of possible dpi values might be useful (for those
> users so inclined). It does have to cross a good chunk of the stack to
> work well, and seems like a lot of work to get right; but the xrandr
> improvements are a start.

Windows used to have a gui that would show a ruler on your monitor and
say "hold a real ruler up to this and slide the slider until its the
same size." Given what's been said about how windows handles DPI I can
only wonder what it did, but it might be a nice thing to have.


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