On Sat, Dec  9, 2017 at 19:21 (-0800), Vincent Reher wrote:

> Hello TDE Developers,

I am not a TDE developer, but if you are willing to hear from random
people on this olist...

> I recently purchased a Dell XPS15 laptop for my daughter and before
> I turn it over to her, I am experimenting to see what must be done
> to make it usable under Linux/TDE for those with no better than
> normal eyesight.  Per EDID, the laptop's native screen resolution is
> 3840 x 2160 and its physical screen dimensions are 346 x 194mm
> (~15.6" diagonal).  My objective is to run the laptop at native
> resolution both inside and outside of X (no re-scaling).
I am using a macbook pro (2880x1800 on a 15" screen) and a 4K 27"
monitor, and I went through this a while back.

Having said that, while I use various TDE programs, I don't use TDE's
window manager, so this advice may not work for you.

<snip>

> Of course, if HiDPI issues have already been addressed by others in
> the post R14.0.4 source code, that would be great.

I solved a lot of problems by putting

    export GDK_SCALE=2

in my ~/.xprofile, which gets read by /etc/X11/xdm/Xsession,
/etc/tde/tdm/Xsession and /etc/kde/kdm/Xsession (at least on my
system) and helps a lot of GTK3 programs look reasonable.

It shouldn't hurt (too much) to give this a try.  I'd be interested in
knowing how it works out.

It is too bad that so many software designers assume that screen
resolutions would be 90 - 100 DPI for all time.

Cheers.

                                Jim