Re: ACPI errors on Dell Latitude E5430

["Martin Hundebøll" <martin@hundeboll.net>]

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 :)

Thanks again.

-- 
Kind Regards
Martin Hundebøll
Frederiks Allé 99, 1.th
8000 Aarhus C
Denmark

+45 61 65 54 61
martin@hundeboll.net
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