Bug 466744

Summary: wayland: 2 monitor setup with 175% scaling on one screen and 100% on the other causes various problems
Product: [Plasma] kwin Reporter: slartibart70
Component: wayland-genericAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED FIXED    
Severity: normal CC: kde, l0rmin, mail, mirh, nate, plasma-bugs, postix
Priority: NOR    
Version: 5.27.2   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description slartibart70 2023-03-02 21:23:03 UTC 
+++ This bug was initially created as a clone of Bug #466683 +++

Operating System: Fedora Linux 37
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.14-200.fc37.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7820HQ CPU @ 2.90GHz
Memory: 31,1 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630

Setup:
Laptop with 2K Laptop screen and a fullhd screen (1920x1080) connected by displayPort
Use fullHD monitor as 'primary' and perform all tests on the fullHD monitor (ignore laptop screen)

Go to systemsettings > display config
and set 175% scale for 2K laptop screen, 100% for fullhd screen.
This makes apps/windows on both monitors the same visual size.

Problem:

The font renderings on the fullhd monitor are not as clear/smooth as compared to normal (100/100% scale).
- This affects the font-rendering which appears pixelated
- The kerning/hinting of letters is also bad (font hinting is set to 'slight', but it gets worse with medium or full)

This is especially noticeable with small fonts like in thunderbird, a browser like chrome/firefox and typical webpage-fonts render smoothly. In my case, i am using Tahoma (ttf) with 8px size.

As indicated above, switching to 100%/100% on both monitors solves the problem
Comment 1 Nate Graham 2023-03-06 17:55:45 UTC 
Can reproduce.
Comment 2 postix 2024-05-04 15:42:34 UTC 
Does this issue still occur with Plasma 6 and Qt 6?
Comment 3 postix 2024-05-04 15:44:09 UTC 
*** Bug 475094 has been marked as a duplicate of this bug. ***
Comment 4 Bug Janitor Service 2024-05-19 03:45:26 UTC 
Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!
Comment 5 slartibart70 2024-05-20 18:58:23 UTC 
Hi all,

this problem seems gone with plasma 6.0.x
Tested on 2 different machines with different resolutions/scaling factors
closing this bug