Workaround for bug report #1175. This is hardware bug.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@20828 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/bus_managers/ps2/ps2_common.c

@@ -176,6 +176,13 @@ ps2_setup_active_multiplexing(bool *enabled)
 no_support:	
 	TRACE("ps2: active multiplexing not supported\n");
 	*enabled = false;
+	// some controllers get upset by the d3 command and will continue data 
+	// loopback, thus send a harmless command (enable keybaord interface)
+	// see bug report #1175
+	res = ps2_command(0xae, NULL, 0, NULL, 0);
+	if (res != B_OK) {
+		INFO("ps2: active multiplexing d3 workaround failed, status 0x%08lx\n", res);
+	}
 	return B_OK;
 
 fail: