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Re: qt5 and qt6 webview not working on Raspberry Pi

Subject: Re: qt5 and qt6 webview not working on Raspberry Pi
From: Brian G <brian@xxxxxxxxxxxxxxxx>
Date: Sat, 28 Feb 2026 16:23:16 -0800 (PST)
To: gbWilly <gbWilly@xxxxxxxxxxxxxx>
Cc: Gambas Users <user@xxxxxxxxxxxxxxxxxxxxxx>

ok same test with x11

Everything appears to work

but following errors on the console

[1819:1819:0228/161833.342540:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.342688:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.342884:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.342936:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.343031:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.343075:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.343161:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.343197:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.343275:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.343311:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.343390:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.343426:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.343507:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.343549:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.343638:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.343677:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.344915:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345049:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.345186:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345224:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.345305:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345343:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.345421:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345458:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.345544:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345580:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.345662:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345698:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.345774:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345809:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

[1819:1819:0228/161833.345882:ERROR:gbm_wrapper.cc(76)] Failed to get fd for plane.: No such file or directory (2)

[1819:1819:0228/161833.345917:ERROR:gbm_wrapper.cc(259)] Failed to export buffer to dma_buf: No such file or directory (2)

config

[System]

Gambas=3.21.99 cc76782bc (master)

OperatingSystem=Linux

Distribution=Debian GNU/Linux 13 (trixie)

Kernel=6.12.62+rpt-rpi-v8

Architecture=aarch64

Cores=4

Memory=7820M

Language=en_US.UTF-8

Platform=x11

Desktop=LXDE

DesktopResolution=96

DesktopScale=9

WidgetTheme=pixtrix

Font=Nunito Sans,12

DarkTheme=False

[Programs]

dpkg=Debian 'dpkg' package management program version 1.22.21 (arm64).

gcc=gcc (Debian 14.2.0-19) 14.2.0

git=git version 2.47.3

msgmerge=msgmerge (GNU gettext-tools) 0.23.1

rpmbuild=RPM version 4.20.1

[Libraries]

Cairo=libcairo.so.2.11804.4

Curl=libcurl.so.4.8.0

DBus=libdbus-1.so.3.38.3

GDK2=libgdk-x11-2.0.so.0.2400.33

GDK3=libgdk-3.so.0.2417.32

GStreamer=libgstreamer-1.0.so.0.2602.0

GTK+2=libgtk-x11-2.0.so.0.2400.33

GTK+3=libgtk-3.so.0.2417.32

OpenGL=libGL.so.1.7.0

Poppler=libpoppler.so.147.0.0

QT5=libQt5Core.so.5.15.15

QT6=libQt6Core.so.6.8.2

RSvg=librsvg-2.so.2.60.0

SDL=libSDL2-2.0.so.0.3200.4

SQLite3=libsqlite3.so.0.8.6

[Environment]

DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus

DESKTOP_SESSION=rpd-x

DISPLAY=:0.0

GB_GUI=gb.gtk3

GDMSESSION=rpd-x

GLIBC_TUNABLES=glibc.malloc.mmap_threshold=131072:glibc.malloc.trim_threshold=131072:glibc.malloc.tcache_count=0

GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1

HOME=<home>

LANG=en_US.UTF-8

LANGUAGE=en_US.UTF-8

LC_ALL=en_US.UTF-8

LOGNAME=<user>

NO_AT_BRIDGE=1

PATH=<home>/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/games:/usr/games

PWD=<home>

QT_LOGGING_RULES=*.debug=false

QT_QPA_PLATFORMTHEME=qt5ct

SAL_USE_VCLPLUGIN=gtk3

SHELL=/bin/bash

SSH_AGENT_PID=1111

SSH_AUTH_SOCK=/tmp/ssh-dhG5vXTfT4dO/agent.1052

TEXTDOMAIN=pam_chksshpwd

TZ=:/etc/localtime

USER=<user>

XAUTHORITY=<home>/.Xauthority

XDG_CONFIG_DIRS=/etc/xdg

XDG_CONFIG_HOME=<home>/.config

XDG_CURRENT_DESKTOP=LXDE

XDG_DATA_DIRS=~/.local/share:/usr/local/share:/usr/share/raspi-ui-overrides:/usr/share:/usr/share/gdm:/var/lib/menu-xdg

XDG_GREETER_DATA_DIR=/var/lib/lightdm/data/<user>

XDG_MENU_PREFIX=rpd-

XDG_RUNTIME_DIR=/run/user/1000

XDG_SEAT=seat0

XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0

XDG_SESSION_CLASS=user

XDG_SESSION_DESKTOP=rpd-x

XDG_SESSION_ID=1

XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0

XDG_SESSION_TYPE=x11

XDG_VTNR=7

_LXSESSION_PID=1052

"Failure is the key to success;
each mistake teaches us something" .. Morihei Ueshiba
Brian G

----- On Feb 23, 2026, at 9:10 AM, gbWilly <gbWilly@xxxxxxxxxxxxxx> wrote:

Hi all,

I discovered that gb.qt5.webview doesn't run on a Debian 12 on Raspberry Pi.
I discovered it using Gambas 3.19.6. So, I installed master version (today) and tested.

Seems that both qt5 and qt6 webview do not work. Note that the gbt3.webview does work.

Attached source archive to reproduce. In the Data folder is the system info of the Pi and of some amd64 systems where qt5.webview works just fine.

Screenshot shows qt5 output when run.

Screenshot shows qt6 output when run.

A bug or what is happening here?
Anyone able to test on a Pi running Debian 13 maybe?

gbWilly

GambOS
Gambas3 for Debian/Ubuntu

...there is always a Catch if things go wrong!

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