Mailinglist Archive: opensuse-factory (824 mails)

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Re: [opensuse-factory] Re: Kontact/kmail crashing often
  • From: Wolfgang Bauer <wbauer@xxxxxx>
  • Date: Tue, 31 Oct 2017 17:18:12 +0100
  • Message-id: <12383037.vp53YzXQMi@amiga>
Am Dienstag, 31. Oktober 2017, 16:40:51 schrieb Luca Beltrame:
Il giorno Tue, 31 Oct 2017 16:34:18 +0100

Wolfgang Bauer <wbauer@xxxxxx> ha scritto:
The patch seems to be incomplete (and therefore ineffictive)
meanwhile though AFAICS, is this on purpose?

I think not, but I don't have NVIDIA hardware so I cannot even test it.

To be more precise, it is missing the part that actually disables OpenGL on
nouveau in the current Tumbleweed packages (and in KDE:Qt5).
I.e. this part from Leap is not there in TW/KDE:Qt5:
@@ -263,8 +295,21 @@ WebEngineContext::WebEngineContext()

GLContextHelper::initialize();

+ bool disableGpu = qEnvironmentVariableIsSet("QT_WEBENGINE_DISABLE_GPU");
+
+ if (!qEnvironmentVariableIsSet("QT_WEBENGINE_DISABLE_NOUVEAU_WORKAROUND")
&& openGLVendor() == QStringLiteral("nouveau"))
+ {
+ qWarning() << "Nouveau openGL driver detected. Qt WebEngine will
disable usage of the GPU.\n"
+ "Please consider using the propietary NVIDIA
drivers.\n\n"
+ "Alternatively, you can set the
QT_WEBENGINE_DISABLE_NOUVEAU_WORKAROUND\n"
+ "environment variable before running this application,
but this is \n"
+ "not recommended since this usually causes applications
to crash as\n"
+ "Nouveau openGL drivers don't support multithreaded
rendering";
+ disableGpu = true;
+ }
+
const char *glType = 0;
- if (!usingANGLE() && !usingSoftwareDynamicGL() &&
!usingQtQuick2DRenderer()) {
+ if (!usingANGLE() && !usingSoftwareDynamicGL() &&
!usingQtQuick2DRenderer() && !disableGpu) {
if (qt_gl_global_share_context()) {
if
(!strcmp(qt_gl_global_share_context()->nativeHandle().typeName(),
"QEGLNativeContext")) {
if (qt_gl_global_share_context()->isOpenGLES()) {

IOW, it's a no-op currently and doesn't actually do anything.

Apparently it would still be needed though...

Kind Regards,
Wolfgang

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