https://bugs.kde.org/show_bug.cgi?id=478082

--- Comment #17 from Oded Arbel <o...@geek.co.il> ---
I've tries a few ways to see if I can reset the incorrect DPI/scaling for an
upgrade:

1. removing "~/.config/k*" and "~/.config/*plasma*" - this did not solve the
problem and the result looks like all the Plasma 6 screenshots with incorrect
scaling that I've posted above, even though all the Plasma settings were reset
(shortcuts and such).

2. removing all of "~/.local" and "~/.config" - this did solve the problem:
after logging in the display configuration was completely reset and I can see
that Plasma display configuration detect scaling of 125% for my 16:10 HD screen
and 175% for my 16:9 UHD screens. After setting the scaling back to 100% it
looks like I expect it to look. There still is a weird issue with the kickoff
menu showing not in the correct location (which was present in the broken
upgraded setup), but that may be another issue all together so I won't discuss
it here anymore.

I've tried to compare the resulting configuration from both (1), (2) and my
working Plasma 5 Wayland setup, and there's a lot of differences that are
mostly color changes and stuff, but I can't find any smoking gun that talks
about DPI and scaling. I did find it weird that in (2), after logging into
Plasma 6 Wayland and setting up the screen, the "~/.local/share/kscreen" folder
was not created and there's no kscren configuration files.

I also found some "kconf update script" called "plasma6.0-remove-dpi-settings"
which is installed and supposedly run at some point (at least that's what
"~/.config/kconf_updaterc" seems to be saying as far as I understand) - and
that seemed relevant, but I couldn't find the source for this executable - so I
don't know what it does and how relevant it may be.

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