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List:       fedora-devel-list
Subject:    Re: F25 workstation, and (almost) hidpi displays
From:       Adam Williamson <adamwill () fedoraproject ! org>
Date:       2016-10-25 16:30:14
Message-ID: 1477413014.4616.29.camel () fedoraproject ! org
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On Tue, 2016-10-25 at 05:16 -0400, Bastien Nocera wrote:
> 
> ----- Original Message -----
> > Adam Williamson wrote:
> > > If you use Fedora (Workstation, at least, and I think maybe KDE too) on
> > > a 3200x1800 13" screen then hidpi mode will kick in, and everything
> > > will be sized as if you were using a 1600x900 13" screen, which is a
> > > pretty common setup.
> > 
> > Yes, Plasma 5 definitely handles that as a hidpi display.
> > 
> > But KDE is actually much smarter and can handle any DPI, though you will
> > likely have to configure it manually, because as you explained, the
> > developers of the commonly used X drivers decided to be jerks and
> > deliberately report a bogus geometry.
> 
> [Citation really needed]

Well, Kevin's framing of this is clearly...opionated...:) but my blog
post gave the citation.

https://www.happyassassin.net/2015/07/09/of-dpis-desktops-and-toolkits/
https://cgit.freedesktop.org/xorg/xserver/tree/hw/xfree86/modes/xf86RandR12.c#n787

as my post explained:

"As you can see there are basically three paths: one if
monitorResolution is set, one if output->conf_monitor->mon_width and
output->conf_monitor->mon_height are set, and a fallback if neither of
those are true. monitorResolution is set if the Xorg binary was called
with the -dpi parameter. mon_width and mon_height are set if some X
config file or another contains the DisplaySize parameter.

If you specified a dpi on the command line, X will figure out whatever
‘physical size' would result in that DPI for the resolution that's in
use, and claim that the screen is that size. If you specify a size with
the DisplaySize parameter, X just uses that. And if neither of those is
true, X will pick a physical size based on a built-in default DPI,
which is...96."
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net
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