2 files changed, 11 insertions, 8 deletions
diff --git a/src/platformsupport/glxconvenience/glxconvenience.pro b/src/platformsupport/glxconvenience/glxconvenience.pro
index 8367dc5e31..1b9cf79080 100644
--- a/src/platformsupport/glxconvenience/glxconvenience.pro
+++ b/src/platformsupport/glxconvenience/glxconvenience.pro
@@ -6,7 +6,7 @@ CONFIG += static internal_module
 
 DEFINES += QT_NO_CAST_FROM_ASCII
 
-QMAKE_USE_PRIVATE += xlib
+QMAKE_USE += xlib
 
 HEADERS += qglxconvenience_p.h
 SOURCES += qglxconvenience.cpp
diff --git a/src/platformsupport/glxconvenience/qglxconvenience.cpp b/src/platformsupport/glxconvenience/qglxconvenience.cpp
index ef413ba98d..5f16d00dad 100644
--- a/src/platformsupport/glxconvenience/qglxconvenience.cpp
+++ b/src/platformsupport/glxconvenience/qglxconvenience.cpp
@@ -224,13 +224,16 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , QSurfaceFormat format
             }
 
             QXlibPointer<XVisualInfo> visual(glXGetVisualFromFBConfig(display, candidate));
-            if (visual.isNull())
-                continue;
-
-            const int actualRed = qPopulationCount(visual->red_mask);
-            const int actualGreen = qPopulationCount(visual->green_mask);
-            const int actualBlue = qPopulationCount(visual->blue_mask);
-            const int actualAlpha = visual->depth - actualRed - actualGreen - actualBlue;
+            int actualRed;
+            int actualGreen;
+            int actualBlue;
+            int actualAlpha;
+            glXGetFBConfigAttrib(display, candidate, GLX_RED_SIZE, &actualRed);
+            glXGetFBConfigAttrib(display, candidate, GLX_GREEN_SIZE, &actualGreen);
+            glXGetFBConfigAttrib(display, candidate, GLX_BLUE_SIZE, &actualBlue);
+            glXGetFBConfigAttrib(display, candidate, GLX_ALPHA_SIZE, &actualAlpha);
+            // Sometimes the visuals don't have a depth that includes the alpha channel.
+            actualAlpha = qMin(actualAlpha, visual->depth - actualRed - actualGreen - actualBlue);
 
             if (requestedRed && actualRed < requestedRed)
                 continue;