linux-kernel - Re: [REGRESSION 3.14-rc6] Samsung N150 lid does not "open" after suspend to RAM.

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Date:	Tue, 25 Mar 2014 17:34:06 +0800
From:	Lan Tianyu <lantianyu1986@...il.com>
To:	Stefan Biereigel <security@...reigel-wb.de>
Cc:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r kernel org" <linux-kernel@...r.kernel.org>,
	Stefan Biereigel <stefan@...reigel.de>,
	Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, san@...snet.pl,
	juanmanuel.cabo@...il.com, clancy.kieran@...il.com,
	dennis.jansen@....de, mauritiusdadd@...il.com
Subject: Re: [REGRESSION 3.14-rc6] Samsung N150 lid does not "open" after
 suspend to RAM.

2014-03-24 19:19 GMT+08:00 Stefan Biereigel <security@...reigel-wb.de>:
> Hi,
> thank you for the suggestion. The patch resolves the issue on my N150
> when applied to a clean 3.14-rc7. Anyways I'm wondering if similar
> problems to mine now exist on the Samsung Series 7/9 notebooks?
>
> Is any further action from my part required?

Do you have these machines? If yes, please provide the output of
dmidecode command.

Cc guys  of commit ad332c8a.

>
> Regards,
> Stefan
>
> Am 24.03.2014 10:30, schrieb Lan Tianyu:
>> Please try the following patch.
>>
>> diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
>> index d7d32c2..9239527 100644
>> --- a/drivers/acpi/ec.c
>> +++ b/drivers/acpi/ec.c
>> @@ -1027,8 +1027,13 @@ static struct dmi_system_id ec_dmi_table[] __initdata = {
>>         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTek Computer Inc."),
>>         DMI_MATCH(DMI_PRODUCT_NAME, "L4R"),}, NULL},
>>         {
>> -       ec_clear_on_resume, "Samsung hardware", {
>> -       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD.")}, NULL},
>> +       ec_clear_on_resume, "Samsung NP530U3B", {
>> +       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
>> +       DMI_MATCH(DMI_PRODUCT_NAME, "530U3BI/530U4BI/530U4BH"),}, NULL},
>> +       {
>> +       ec_clear_on_resume, "Samsung NP530U3C", {
>> +       DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
>> +       DMI_MATCH(DMI_PRODUCT_NAME, "530U3C/530U4C/532U3C"),}, NULL},
>>         {},
>>  };
>>
>>
>>
>>
>> 2014-03-24 15:50 GMT+08:00 Stefan Biereigel <security@...reigel-wb.de>:
>>> Hi,
>>>
>>> starting with 3.14-rc6, the lid on my Samsung N150 behaves weird: My
>>> system is set up, so that it should suspend to RAM as soon as the lid is
>>> closed. Beginning with 3.14-rc6, the lid goes from "open" to "closed"
>>> correctly the first time (and the system suspends), but after resuming
>>> from standby (by opening the lid), the lid does not change to "open" again.
>>> Of course, closing the lid again does not induce suspend to RAM then.
>>> Opening the lid now (while not sleeping), makes ACPI notify the opening,
>>> so I guess ACPI "misses" or discards the lid open event from the EC when
>>> coming from sleep.
>>> Now, closing the lid again does induce suspend to RAM. This behaviour is
>>> reproducible: every other time, suspending works.
>>>
>>> This behaviour seems to be introduced by commit ad332c8a: ACPI / EC:
>>> Clear stale EC events on Samsung systems.
>>> Which was introduced after 3.14-rc5.
>>>
>>> When opening the lid to resume from standby, i see in dmesg:
>>> Mar 23 22:12:04 little1 kernel: [ 7630.932074] ACPI : EC: 1 stale EC
>>> events cleared
>>> (which comes from drivers/acpi/ec.c)
>>>
>>> Seems to me, that the "open" event is cleared from the EC, but also
>>> discarded instead of passed on. Shouldn't the correct behaviour be to
>>> report all the pending events, read from the EC, as ACPI events? Can you
>>> point me in a direction for fixing the issue cleanly, then I will try to
>>> find a solution and prepare a patch for this issue.
>>>
>>> Best regards,
>>> Stefan
>>>
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
>>> the body of a message to majordomo@...r.kernel.org
>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>
>>
>>



-- 
Best regards
Tianyu Lan
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