Patch "ALSA: hda - Disable power_save_node for IDT 92HD73xx chips" has been added to the 4.2-stable tree

This is a note to let you know that I've just added the patch titled

ALSA: hda - Disable power_save_node for IDT 92HD73xx chips

to the 4.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
alsa-hda-disable-power_save_node-for-idt-92hd73xx-chips.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Takashi Iwai <[email protected]>
Date: Sun, 4 Oct 2015 22:44:12 +0200
Subject: ALSA: hda - Disable power_save_node for IDT 92HD73xx chips

From: Takashi Iwai <[email protected]>

commit c7e1008048a97148d3aecae742f66fb2f944644c upstream.

The recent widget power saving introduced some unavoidable click noises on old IDT 92HD73xx chips while it still seems working on the compatible new chips. In the bugzilla, we tried lots of tests and workarounds, but they didn't help much. So, let's disable the feature for these specific chips as the least (but safest) fix.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=104981

---
 sound/pci/hda/patch_sigmatel.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

@@ -4520,7 +4520,11 @@ static int patch_stac92hd73xx(struct hda
 		return err;
 
 	spec = codec->spec;
-	codec->power_save_node = 1;
+	/* enable power_save_node only for new 92HD89xx chips, as it causes
+	 * click noises on old 92HD73xx chips.
+	 */
+	if ((codec->core.vendor_id & 0xfffffff0) != 0x111d7670)
+		codec->power_save_node = 1;
 	spec->linear_tone_beep = 0;
 	spec->gen.mixer_nid = 0x1d;
 	spec->have_spdif_mux = 1;

Patches currently in stable-queue which might be from [email protected] are

queue-4.2/alsa-hda-disable-power_save_node-for-idt-92hd73xx-chips.patch queue-4.2/x86-kexec-fix-kexec-crash-in-syscall-kexec_file_load.patch queue-4.2/alsa-hda-disable-power_save_node-for-thinkpads.patch queue-4.2/alsa-hda-add-dock-support-for-thinkpad-t550.patch queue-4.2/alsa-hda-apply-spdif-pin-ctl-to-macbookpro-12-1.patch queue-4.2/leds-lp55xx-correct-kconfig-dependency-for-f-w-user-helper.patch queue-4.2/alsa-synth-fix-conflicting-oss-device-registration-on-awe32.patch queue-4.2/alsa-hda-tegra-async-probe-for-avoiding-module-loading-deadlock.patch