rpi5/Trixie and many PyQt6 messages about QPalette

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6 months 4 weeks ago #345089 by rdtsc
rpi5/Trixie and many PyQt6 messages about QPalette was created by rdtsc
Hi, on my rpi5/7c80 with Debian Trixie, PyQt6 apps like to display weird QPalette messages like this:
Code:
... hm2/hm2_7c80.0:     IO Pin 049 (P1-17/DB25-09): IOPort hm2/hm2_7c80.0:     IO Pin 050 (P1-19/DB25-10): IOPort hm2/hm2_7c80.0:     IO Pin 051 (P1-21/DB25-11): Encoder #1, pin A (Input) hm2/hm2_7c80.0:     IO Pin 052 (P1-23/DB25-12): Encoder #1, pin B (Input) hm2/hm2_7c80.0:     IO Pin 053 (P1-25/DB25-13): Encoder #1, pin Index (Input) hm2/hm2_7c80.0: registered Found file(REL): ./vc-p2s.hal virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::SystemPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::ToolButtonPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::ButtonPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::CheckBoxPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::RadioButtonPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::HeaderPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::ItemViewPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::MessageBoxLabelPelette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::TabBarPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::LabelPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::GroupBoxPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::MenuPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::MenuBarPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::TextEditPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::TextEditPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::TextLineEditPalette virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::ToolTipPalette virtual QVariant Qt6CTPlatformTheme::themeHint(QPlatformTheme::ThemeHint) const virtual const QPalette* Qt6CTPlatformTheme::palette(QPlatformTheme::Palette) const QPlatformTheme::SystemPalette Shutting down and cleaning up LinuxCNC... task: 948 cycles, min=0.000004, max=0.012919, avg=0.009934, 0 latency excursions (> 10x expected cycle time of 0.010000s) hm2: unloading Note: Using POSIX realtime mycnc@mycnc:~ $ 

This does not happen at all for PyQt5 apps - specifically only PyQt6.  While not a problem per se, I looked for a way to eliminate these messages.  From what little I could gather, it has to do with Qt6 platform theme.  Perhaps it is not installed correctly or is missing a component, as this doesn't happen for at least one other rpi5/Trixie user.  Anyways, a work-around was to add the following environment variable to the end of ~/.bashrc:
Code:
# okay weird one here... this squelches 17 QPalette messages from PyQt6 apps... export QT_QPA_PLATFORMTHEME='kde **.**'

You can then either restart or issue a  source ~/.bashrc  in the terminal to reload that.  Apparently this may make PyQt6 apps appear a little differently (more like the kde theme?)  I haven't noticed a difference but haven't looked too hard.  But more importantly, it removed all of those notices about QPalette.

There is likely some other, better method for actually fixing the issue, whatever that may be... but this does the trick for now. :)

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6 months 3 weeks ago #345347 by rdtsc
Replied by rdtsc on topic rpi5/Trixie and many PyQt6 messages about QPalette
I thought maybe I could be missing some package, so searched apt for things which might be related to Qt and platform theme, and found that only qt5-gtk2-platformtheme was installed - none for qt6.  So then I tried installing qt6-xdgdesktopportal-platformtheme and qt6-gtk-platformtheme but neither made any difference.  So this appears to be more involved than initially suspected.

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