Re: ACPI errors on Dell Latitude E5430

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 10/03/2012 08:36 AM, Martin Hundebøll wrote:
> On 2012-10-02 13:14, Hans de Goede wrote:
>> Hi,
>>
>> On 10/02/2012 11:22 AM, Martin Hundebøll wrote:
>>> Hi Hans,
>>>
>>> On 2012-10-01 20:38, Hans de Goede wrote:
>>>> 2) Even with a 3.6 which shows the problematic behavior, I can
>>>> make things work by adding acpi.ec_delay=2000 to the kernel cmdline,
>>>> the debug traces show that the EC takes it sweet time to respond
>>>> (sometime close to 2 seconds) but it does eventually respond in all
>>>> cases I've seen sofar.
>>>>
>>>> This also seems to fix a sporadic occurence of:
>>>> "ACPI: EC: input buffer is not empty aborting transaction"
>>>> Which I'm seeing with 3.5 / 3.6 in a non debug build.
>>>>
>>>> Martin, can you see if adding that helps you with the E5430 problems
>>>> too ?
>>>
>>> As far as I can tell from the attached dmesg, the errors are gone
>>> after setting acpi.ec_delay=2000. Thanks a lot!
>>>
>>> The only remaining issue is the fan control, which works as expected
>>> initially, but then fails to spin down after a few minutes.
>>
>> Hmm, I'm seeing the same thing, but only when charging my battery, and
>> then indeed
>> does not spin down completely, but it does step down from vacuum cleaner
>> mode to
>> something more pleasant after the machine was loaded for a while and
>> returns back
>> to idle.
>>
>> Also it spins up to its slowest speed by jut using the charger, so I
>> think it is
>> just bleeding of heat caused by the charging hardware in this case (for
>> me).
>
> For the record, my fan keeps spinning also when on battery (as reported by i8k/sensors):
>
>    i8k-virtual-0
>    Adapter: Virtual device
>    Right Fan:   84000 RPM
>    CPU:          +39.0C
>
> This is not a total show-stopper, but nevertheless quite annoying when the home-office is shared with the bedroom :)

Ah right, you added acpi_enforce_resources=lax to get i8k to work, right, hint:
DO NOT DO THAT!

See: http://lm-sensors.org/wiki/FAQ/Chapter3#Mysensorshavestoppedworkinginkernel2.6.31

So please try again without any custom kernel options, other then
acpi.ec_delay=2000

Regards,

Hans
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