linux-kernel - thinkpad_acpi: Saving bluetooth state to NVRAM problem and fix

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Message-ID: <20120610091840.GA4960@scharfenberg>
Date:	Sun, 10 Jun 2012 13:18:41 +0400
From:	Vsevolod Kozlov <zaba@...t.net>
To:	linux-kernel@...r.kernel.org
Subject: thinkpad_acpi: Saving bluetooth state to NVRAM problem and fix

Hello,

thinkpad_acpi normally fails to save Bluetooth state to NVRAM on my system
(ThinkPad X120e).  However, a small change in the code fixes the functionality:

--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -3999,7 +3999,7 @@ static const struct tpacpi_rfk_ops bluetooth_tprfk_ops = {
 static void bluetooth_shutdown(void)
 {
 	/* Order firmware to save current state to NVRAM */
-	if (!acpi_evalf(NULL, NULL, "\\BLTH", "vd",
+	if (!acpi_evalf(NULL, NULL, "\\_SB.BLTH", "vd",
 			TP_ACPI_BLTH_SAVE_STATE))
 		pr_notice("failed to save bluetooth state to NVRAM\n");
 	else

I can't tell whether this breaks the functionality on other ThinkPad systems
because I don't have any, though.

Please CC me any responses, as I am not subscribed to the list.

Regards,

-- 
Zaba
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