linux-kernel - Re: [V2 PATCH] ALSA: hda - Enable mute/mic-mute LEDs for more Thinkpads with Conexant codec

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Message-ID: <55603F22.8070103@web.de>
Date:	Sat, 23 May 2015 10:49:38 +0200
From:	Jan Kiszka <jan.kiszka@....de>
To:	Hui Wang <hui.wang@...onical.com>, alex.hung@...onical.com
CC:	Hui Wang <jason77.wang@...il.com>, tiwai@...e.de,
	alsa-devel@...a-project.org, yk@...onical.com,
	david.henningsson@...onical.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [V2 PATCH] ALSA: hda - Enable mute/mic-mute LEDs for more Thinkpads
 with Conexant codec

On 2014-07-03 11:24, Hui Wang wrote:
> On 07/03/2014 05:05 PM, Jan Kiszka wrote:
>> On 2014-07-03 10:59, Hui Wang wrote:
>>> On 07/03/2014 03:04 PM, Jan Kiszka wrote:
>>>> On 2014-07-01 11:26, Hui Wang wrote:
>>>>> On 07/01/2014 03:38 PM, Jan Kiszka wrote:
>>>>>> On 2014-07-01 04:15, Hui Wang wrote:
>>>>>>> On 06/30/2014 02:45 PM, Jan Kiszka wrote:
>>>>>>>> On 2014-06-30 04:04, Hui Wang wrote:
>>>>>>>>> On 06/29/2014 07:33 PM, Jan Kiszka wrote:
>>>>>>>>>> On 2013-11-27 07:47, Hui Wang wrote:
>>>>>>>>>>> Most Thinkpad Edge series laptops use conexant codec, so far
>>>>>>>>>>> although
>>>>> <snip>
>>>>>>>> Is there anything I can debug or any information I can collect
>>>>>>>> from my
>>>>>>>> box to examine this?
>>>>>>> What is the linux distribution on your machine? And use showkey to
>>>>>>> catch
>>>>>>> the keycode of that button.
>>>>>> I'm running OpenSUSE 13.1. The reported keycode of the power
>>>>>> button is
>>>>>> 116.
>>>>> It seems the keycode is correct, it is power keycode rather the mute
>>>>> keycode.
>>>>>
>>>>> Could you please do some debug, let us find which line of code is the
>>>>> root cause for this problem. for example:
>>>>>
>>>>> after running the line, the problem shows up:
>>>>>
>>>>> 1.     if (ACPI_SUCCESS(acpi_get_devices("LEN0068", acpi_check_cb,
>>>>> &found, NULL)) && found) // in the sound/pci/hda/thinkpad_helper.c,
>>>>> is_thinkpad()
>>>> This evaluates to true
>>>>
>>>>> 2.     return ACPI_SUCCESS(acpi_get_devices("IBM0068", acpi_check_cb,
>>>>> &found, NULL)) && found; // same as above
>>>>>
>>>>> 3.         if (led_set_func(TPACPI_LED_MUTE, false) >= 0) { //in the
>>>>> sound/pci/hda/thinkpad_helper.c, hda_fixup_thinkpad_acpi()
>>>> ...and this
>>>>
>>>>> 4. if (led_set_func(TPACPI_LED_MICMUTE, false) >= 0) { // same as
>>>>> above
>>>>>
>>>> ...and this as well. spec->num_adc_nids is 1.
>>>
>>> If we change the code like below, does the power button can work well?
>>>
>>> in the thinkpad_helper.c, hda_fixup_thinkpad_acpi()
>>>
>>>
>>>          if (led_set_func(TPACPI_LED_MUTE, false) >= 0) {
>>>              /*
>>>              old_vmaster_hook = spec->vmaster_mute.hook;
>>>              spec->vmaster_mute.hook = update_tpacpi_mute_led;
>>>              removefunc = false;
>>>             */
>> Disabling only this block resolves the issue.
> 
> So Below two lines make the power button change to the reset button.
> 
> drivers/platform/x86/thinkpad_acpi.c  mute_led_on_off():
> 
> acpi_get_handle(hkey_handle, "SSMS", &temp);
> acpi_evalf(hkey_handle, &output, "SSMS", "dd", 1);
> 
> 
> @alexhung,
> Do you have any idea why this can affect the power button behavior?
> 

I think we all lost track of this issue, but it unfortunately still
exists in the latest kernel, requiring custom builds here. How can we
proceed?

Thanks,
Jan



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