The "hardware" switch is tied directly to a BIOS interface that will

connect and disconnect the hardware from the bus.

If you use the software interface to request the BIOS to make these
changes, the HW switch will be in an inconsistent state and LEDs may not
reflect the state of the HW.
Signed-off-by: Mario Limonciello <Mario_Limonciello@Dell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/platform/x86/dell-laptop.c

@@ -181,6 +181,10 @@ static int dell_rfkill_set(void *data, bool blocked)
 	unsigned long radio = (unsigned long)data;
 
 	memset(&buffer, 0, sizeof(struct calling_interface_buffer));
+	dell_send_request(&buffer, 17, 11);
+	if (!(buffer.output[1] & BIT(16)))
+		return -EINVAL;
+
 	buffer.input[0] = (1 | (radio<<8) | (disable << 16));
 	dell_send_request(&buffer, 17, 11);