Re: ACPI errors on Dell Latitude E5430

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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).

> Is this ACPI related?

That could be the case.

And if so, please instruct me how to debug further.

I'm afraid I cannot help there, maybe someone else on the list can ...

Regards,

Hans
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