[kde] [Bug 488108] Fonts are blurry - regression in 6.0.5 (Wayland)

[Andrea Ippolito]

https://bugs.kde.org/show_bug.cgi?id=488108

--- Comment #2 from Andrea Ippolito <andrea.ippo at gmail.com> ---
(In reply to Nate Graham from comment #1)

Thank you so much Nate for your reply!

> Were there any other system upgrades that happened at the same time?

Definitely, but it would honestly be quite hard to figure out what else has
changed.

I have a btrfs snapshot taken with snapper listing all the differences, I doubt
it's of any use but I have the textual diff if needed (40MBs of fun!)

I know that Linux allows for some font config by symlinking stuff from
/usr/share/fonts-config/conf.avail (among others) to /etc/fonts/conf.d/

A couple of files were added there during the update, and the others stayed the
same.

Still, just to rule out this change to be the cause of the problem, I took the
state of the "good" snapshot (which I booted into to check how the symlinks
looked like) and applied it to the running/latest/6.0.5 snapshot, then rebooted
and...still blurry. So that's not it.

> For
> example anything from Qt? Because font rendering in apps is generally
> something that comes from the toolkit, not any KDE code. Looking through the
> KWin commits visible at
> https://kde.org/announcements/changelogs/plasma/6/6.0.4-6.0.5/, I see one
> thing that *maybe* could have caused this if you're using a fractional scale
> factor:
> https://invent.kde.org/plasma/kwin/-/commit/
> 6f224350961453b286b4865798a624f3560bde01
> 
> Are you using a fractional scale factor? And if you are, does the problem go
> away if you change the scale factor to 100% or 200%?

I definitely am, but following your prompt I did some additional tests.

I have a dual monitor setup where the external is unscaled, but the laptop one
is at 125%. The problem happens also on the unscaled one.

I initially ruled out fractional scaling as a possible cause, because I had
reproduced the problem immediately after setting the laptop back to 100%.

What I didn't think to do, though, was (please don't hate me :D ) to close and
reopen the app (Kate in this case), in order to see the effects of the scaling
change. Or restarting the plasmashell for every other part of the UI
(`systemctl --user restart plasma-plasmashell.service`).

If I had done that, I would've noticed that fonts immediately look GREAT again.

> And if it does, are you able to test KWin with that commit reverted?

I would gladly try. I have an 8 core CPU that can take some more compiling :)

Would you be so kind as to point me to the recommended documentation on how to
build from source and run this?

Thanks!

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