Re: F25 workstation, and (almost) hidpi displays

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On Fri, 2016-10-21 at 12:44 -0600, Chris Murphy wrote:
> HP Spectre 13" 1920x1080 and all text everywhere by default is just on
> the cusp of too small. I don't think this is really a hidpi display,
> so I'd expect this problem to be much worse if it were 3200x1800.

Actually, no, it'd be better. hidpi support goes in integers. I don't
think any display in the world actually triggers 3x hidpi yet, so
practically speaking, it's either on or it's off.

The cutoff for 2x hidpi is 192dpi: if your screen is above 192dpi
you'll get 2x hidpi, if it isn't, you won't. Now to the math!

1920x1080 at 13" is 169.45dpi, so you don't get hidpi.
3200x1800 at 13" is 282.42dpi, so you *do* get hidpi.

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.

1920x1080 13" displays are actually just really awkward, as they fall
right in between what's approximately a 'standard' DPI for a laptop
display (110-140) and a level at which simple 2x hidpi would give you a
decent experience (if you try enabling 2x hidpi on a 1920x1080 13"
display, you'll see everything becomes way too big, as your effective
DPI is now ~85, which is way too low on a laptop).

> To compensate, I'm using Large Text in Universal Access. But
> applications don't use that, such as Firefox.  Further,
> Preferences>Content >Fonts & Colors> Size is not used on many sites,
> so that produces mixed results. Yes I can control-+ to get bigger
> text, but that's a per page setting apparently - so I get even more
> mixed results.
> 
> So... what am I missing that'd make this a better out of the box experience?

Use the 'scaling factor' setting in gnome-tweak-tool. On my 1920x1080
13" laptop (yup, I have one too) I set it to 1.3; adjust for your
taste. Firefox should respect that setting so long as you have
layout.css.dpi set to -1 (which is the modern default), though I'm not
actually sure if that works on Wayland. You can also set a 'minimum
font size' in the Firefox advanced font settings, though even that
isn't universally respected, I don't think (web font rendering
is...complicated).
-- 
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Twitter: AdamW_Fedora | XMPP: adamw AT happyassassin . net
http://www.happyassassin.net
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