calibre

epub text shows in a jaggy font in wayland

Bug #2018658 reported by Munzir Taha (منذر طه)
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
calibre
Won't Fix
Undecided
Unassigned

Bug Description

when I open any epub file, the text looks jaggy in wayland. There are two workarounds, I can either launch it with QT_QPA_PLATFORM=xcb, I can hange my monitor resolution scale to 100% instead of the current 150%. Attached is a screenshot.

Operating System: Arch Linux
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Kernel Version: 6.2.12-arch1-1 (64-bit)
Graphics Platform: Wayland
Graphics Processor: AMD Radeon Graphics
Screen: 2561 x 1601
Scale: 150%

Revision history for this message
Munzir Taha (منذر طه) (munzirtaha) wrote :
Revision history for this message
Kovid Goyal (kovid) wrote :

calibre contains no wayland specific code. This will be an interaction
between Qt WebEngine, your particular wayland compiositor and your GPU
drivers. As usual, I strongly recommend not using Wayland, it is nowhere
near ready for serious use.

Changed in calibre:
status: New → Won't Fix
Revision history for this message
q234rty (q234rty) wrote :

The Arch Linux build of calibre uses the system qt 6.5 which is affected by https://bugreports.qt.io/browse/QTBUG-113574.

As a workaround that does not involve forcing Xwayland, you can launch it with QT_SCALE_FACTOR_ROUNDING_POLICY=RoundPreferFloor instead.

Revision history for this message
Munzir Taha (منذر طه) (munzirtaha) wrote :

@q234rty: Thanks a lot for this valuable piece of information.

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