Bug 106757

Summary:	Qt's QOpenGLWidget renders a blank screen under XWayland
Product:	Mesa	Reporter:	Michael Arnold <myk321>
Component:	Drivers/DRI/i915	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:	Default DRI bug account <dri-devel>
Severity:	normal
Priority:	medium
Version:	18.0
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Qt Application renders correctly using MESA software rendering Qt Application renders incorrectly under XWayland Qt Application renders correctly under Wayland

Description Michael Arnold 2018-05-31 13:40:55 UTC

Created attachment 139886 [details]
Qt Application renders correctly using MESA software rendering

With intel integrated graphics, the Qt Surface example, that uses QOpenGLWidget, on Fedora 28 under an wayland session and then run under xwayland by starting the Qt application using the command:

./surface -platform xcb

results in the Qt application being displayed correctly, but the 3D data visualization is shown incorrectly as blank panel  (see attached).

The same Qt application in a Wayland session with MESA software rendering also under xwayland as follows:

LIBGL_ALWAYS_SOFTWARE=1 ./surface -platform xcb

results in the application and 3D data visualization being displayed correctly (see attached).

The same Qt application in a XOrg session results in the application and 3D data visualization being displayed correctly.

The same Qt application in a Wayland session run under wayland results in the application and 3D data visualization being displayed correctly.

This issue is logged as a Qt defect here: https://bugreports.qt.io/browse/QTBUG-68263

A similar issue is described for GNU Octave here: https://savannah.gnu.org/bugs/?51442

Comment 1 Michael Arnold 2018-05-31 13:42:06 UTC

Created attachment 139887 [details]
Qt Application renders incorrectly under XWayland

Comment 2 Michael Arnold 2018-05-31 13:42:42 UTC

Created attachment 139888 [details]
Qt Application renders correctly under Wayland

Comment 3 Michael Arnold 2018-11-12 06:13:00 UTC

Under Fedora 29 (Mesa 18.2.4) and Qt 5.12 Beta 4 this issue is no longer present.

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