Wait for the VT to become active when switching to avoid a suspected race condition somewhere between LightDM, X, ConsoleKit and the kernel

1 files changed, 8 insertions, 0 deletions

diff --git a/src/vt.c b/src/vt.c
index 62839d9d..a0fe2091 100644
--- a/src/vt.c
+++ b/src/vt.c
@@ -80,8 +80,16 @@ vt_set_active (gint number)
     if (console_fd >= 0)
     {
         int n = number;
+
         if (ioctl (console_fd, VT_ACTIVATE, n) < 0)
             g_warning ("Error using VT_ACTIVATE %d on /dev/console: %s", n, strerror (errno));
+
+        /* Wait for the VT to become active to avoid a suspected
+         * race condition somewhere between LightDM, X, ConsoleKit and the kernel.
+         * See https://bugs.launchpad.net/bugs/851612 */
+        if (ioctl (console_fd, VT_WAITACTIVE) < 0)
+            g_warning ("Error using VT_WAITACTIVE %d on /dev/console: %s", n, strerror (errno));
+
         close (console_fd);
     }
 #endif