[alsa-devel] [PATCH] Revert "ALSA: hda - Add mute-LED mode control to Thinkpad"

[Pali Rohár]

On Sunday 24 May 2015 08:34:35 Takashi Iwai wrote:
> This reverts commit 7290006d8c0900c56d8c58428134f02c35109d17.
> 
> Through the regression report, it was revealed that the
> tpacpi_led_set() call to thinkpad_acpi helper doesn't only toggle the
> mute LED but actually mutes the sound.  This is contradiction to the
> expectation, and rather confuses user.
> 
> According to Henrique, it's not trivial to judge which TP model
> behaves "LED-only" and which model does whatever more intrusive, as
> Lenovo's implementations vary model by model.  So, from the safety
> reason, we should revert the patch for now.
> 
> Reported-by: Martin Steigerwald <martin at lichtvoll.de>
> Cc: Pali Rohár <pali.rohar at gmail.com>
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> ---
>  sound/pci/hda/thinkpad_helper.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/sound/pci/hda/thinkpad_helper.c b/sound/pci/hda/thinkpad_helper.c
> index d51703e30523..0a4ad5feb82e 100644
> --- a/sound/pci/hda/thinkpad_helper.c
> +++ b/sound/pci/hda/thinkpad_helper.c
> @@ -72,7 +72,6 @@ static void hda_fixup_thinkpad_acpi(struct hda_codec *codec,
>  		if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
>  			old_vmaster_hook = spec->vmaster_mute.hook;
>  			spec->vmaster_mute.hook = update_tpacpi_mute_led;
> -			spec->vmaster_mute_enum = 1;
>  			removefunc = false;
>  		}
>  		if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) {

Hello,

what about adding option to "do not touch led" like if thinkpad_helper.c
cannot resolve symbol from kernel? It would at least allow us to disable
led when mute is ON (when thinkpad_acpi.ko module is loaded).

-- 
Pali Rohár
pali.rohar at gmail.com