diff options
| -rw-r--r-- | src/plugins/platforms/xcb/qxcbscreen.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/plugins/platforms/xcb/qxcbscreen.cpp b/src/plugins/platforms/xcb/qxcbscreen.cpp index de325ceb16..c93b4863e1 100644 --- a/src/plugins/platforms/xcb/qxcbscreen.cpp +++ b/src/plugins/platforms/xcb/qxcbscreen.cpp @@ -108,7 +108,11 @@ QXcbScreen::QXcbScreen(QXcbConnection *connection, xcb_screen_t *screen, int num free(reply); - m_syncRequestSupported = m_windowManagerName != QLatin1String("KWin"); + const xcb_query_extension_reply_t *sync_reply = xcb_get_extension_data(xcb_connection(), &xcb_sync_id); + if (!sync_reply || !sync_reply->present) + m_syncRequestSupported = false; + else + m_syncRequestSupported = m_windowManagerName != QLatin1String("KWin"); m_clientLeader = xcb_generate_id(xcb_connection()); Q_XCB_CALL2(xcb_create_window(xcb_connection(), |