This is a note to let you know that I've just added the patch titled
ALSA: hda - restore the gpio led after resume
to the 3.14-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-restore-the-gpio-led-after-resume.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f475371aa65de84fa483a998ab7594531026b9d9 Mon Sep 17 00:00:00 2001
From: Hui Wang <hui.wang@xxxxxxxxxxxxx>
Date: Tue, 19 Aug 2014 12:07:03 +0800
Subject: ALSA: hda - restore the gpio led after resume
From: Hui Wang <hui.wang@xxxxxxxxxxxxx>
commit f475371aa65de84fa483a998ab7594531026b9d9 upstream.
On some HP laptops, the mute led is controlled by codec gpio.
When some machine resume from s3/s4, the codec gpio data will be
cleared to 0 by BIOS:
Before suspend:
IO[3]: enable=1, dir=1, wake=0, sticky=0, data=1, unsol=0
After resume:
IO[3]: enable=1, dir=1, wake=0, sticky=0, data=0, unsol=0
To skip the AFG node to enter D3 can't fix this problem.
A workaround is to restore the gpio data when the system resume
back from s3/s4. It is safe even on the machines without this
problem.
BugLink: https://bugs.launchpad.net/bugs/1358116
Tested-by: Franz Hsieh <franz.hsieh@xxxxxxxxxxxxx>
Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/pci/hda/patch_realtek.c | 9 +++++++++
1 file changed, 9 insertions(+)
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3064,6 +3064,15 @@ static int alc269_resume(struct hda_code
snd_hda_codec_resume_cache(codec);
alc_inv_dmic_sync(codec, true);
hda_call_check_power_status(codec, 0x01);
+
+ /* on some machine, the BIOS will clear the codec gpio data when enter
+ * suspend, and won't restore the data after resume, so we restore it
+ * in the driver.
+ */
+ if (spec->gpio_led)
+ snd_hda_codec_write(codec, codec->afg, 0, AC_VERB_SET_GPIO_DATA,
+ spec->gpio_led);
+
if (spec->has_alc5505_dsp)
alc5505_dsp_resume(codec);
Patches currently in stable-queue which might be from hui.wang@xxxxxxxxxxxxx are
queue-3.14/alsa-hda-restore-the-gpio-led-after-resume.patch
queue-3.14/alsa-hda-fix-an-external-mic-jack-problem-on-a-hp-machine.patch
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