[PATCH] ALSA: hda - fix the micmute led status for Lenovo ThinkCentre AIO

[Takashi Iwai]

On Tue, 11 Aug 2020 13:55:25 +0200,
Hui Wang wrote:
> 
> 
> On 2020/8/11 下午5:22, Takashi Iwai wrote:
> > On Tue, 11 Aug 2020 11:03:55 +0200,
> > Hui Wang wrote:
> >>
> >> On 2020/8/11 下午4:56, Kai-Heng Feng wrote:
> >>> Hi,
> >>>
> >>>> On Aug 10, 2020, at 14:51, Takashi Iwai <tiwai at suse.de> wrote:
> >>>>
> >>>> On Mon, 10 Aug 2020 08:34:36 +0200,
> >>>> Hui Wang wrote:
> >>>>> On 2020/8/10 下午2:30, Takashi Iwai wrote:
> >>>>>> On Mon, 10 Aug 2020 04:16:59 +0200,
> >>>>>> Hui Wang wrote:
> >>>>>>> After installing the Ubuntu Linux, the micmute led status is not
> >>>>>>> correct. Users expect that the led is on if the capture is disabled,
> >>>>>>> but with the current kernel, the led is off with the capture disabled.
> >>>>>>>
> >>>>>>> We tried the old linux kernel like linux-4.15, there is no this issue.
> >>>>>>> It looks like we introduced this issue when switching to the led_cdev.
> >>>>>> The behavior can be controlled via "Mic Mute-LED Mode" enum kcontrol.
> >>>>>> Which value does it have now?  If it's "Follow Capture", that's the
> >>>>>> correct behavior.  OTOH, if it's "Follow Mute", the LED polarity is
> >>>>>> indeed wrong.
> >>>>> It is "Follow Mute",  if I change it to "Follow Capture" manually, the
> >>>>> led status becomes correct.
> >>>> OK, thanks for confirmation.  Applied now.
> >>> I wonder if it's because how brightness value passed to gpio_mute_led_set() and micmute_led_set():
> >>>
> >>> static int gpio_mute_led_set(struct led_classdev *led_cdev,
> >>>                                enum led_brightness brightness)
> >>> {
> >>>           struct hda_codec *codec = dev_to_hda_codec(led_cdev->dev->parent);
> >>>           struct alc_spec *spec = codec->spec;
> >>>
> >>>           alc_update_gpio_led(codec, spec->gpio_mute_led_mask,
> >>>                               spec->mute_led_polarity, !brightness);
> >>>           return 0;
> >>> }
> >>>
> >>> static int micmute_led_set(struct led_classdev *led_cdev,
> >>>                              enum led_brightness brightness)
> >>> {
> >>>           struct hda_codec *codec = dev_to_hda_codec(led_cdev->dev->parent);
> >>>           struct alc_spec *spec = codec->spec;
> >>>
> >>>           alc_update_gpio_led(codec, spec->gpio_mic_led_mask,
> >>>                               spec->micmute_led_polarity, !!brightness);
> >>>           return 0;
> >>> }
> >>>
> >>> Maybe we should let micmute_led_set() match gpio_mute_led_set() so the micmute polarity can be removed?
> >> This will impact many many machines, I don't know if the current code
> >> could work correctly or not on other machines.
> > True.  But we should rather fix this, the current flag is illogical.
> > I forgot about this problem while I also noticed during working on the
> > led cdev conversion.
> >
> > I guess most of configurations can be verified with hda-emu or such.
> > Let's see...
> 
> I just checked, the commit 87dc36482cab (ALSA: hda/realtek - Add LED
> class support for micmute LED) introduced this issue. In the
> micmute_led_set(), it set the led with the !!mic_mute.led_value, while
> before this commit, the driver sets the led with !mic_mute.led_value.
> 
> Add with this commit 7cdf8c49b1df (ALSA: hda: generic: Add a helper
> for mic-mute LED with LED classdev),  all micmute led updating will
> call micmute_led_set(). It impacts alc269_fixup_hp_gpio_led(),
> alc285_fixup_hp_gpio_led(), alc286_fixup_hp_gpio_led(),
> alc280_fixup_hp_gpio2_mic_hotkey() and
> alc233_fixup_lenovo_line2_mic_hotkey()
> 
> I think it is safe to change the micmute_led_set() and remove all
> spec->micmute_led_polarity = 1.
> 
> Let me write a patch.

Great, thanks for spotting out.


Takashi