fbcon: Delay the start of the cursor timer until a con_switch()

As reported in Bugzilla Bug 9093, upon switching to X, a small rectangular cursor can still be seen blinking in the upper left part of the screen. It is fbcon's text cursor. This is caused by a strange ioctl(..., KDSETMODE, KD_TEXT) call done by something in userspace, perhaps by X itself, while the tty is still in graphics mode. And when the tty is in KD_TEXT mode, the cursor timer is restarted.

Although this is a userspace problem, we can work around it by delaying the restart of the cursor timer until an fbcon_switch() is called. In other words, the cursor timer will not be restarted even if a KD_TEXT mode switch is requested.

Regression potential: Present but low

---

 drivers/video/console/fbcon.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 97a0224..0f32f4a 100644
@@ -2405,7 +2405,7 @@ static int fbcon_blank(struct vc_data *v
 			update_screen(vc);
 	}
 
-	if (fbcon_is_inactive(vc, info) ||
+	if (mode_switch || fbcon_is_inactive(vc, info) ||
 	    ops->blank_state != FB_BLANK_UNBLANK)
 		fbcon_del_cursor_timer(info);
 	else

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