From mboxrd@z Thu Jan 1 00:00:00 1970 From: Felix Domke Subject: Who else is writing to the EC? (Sony Vaio S3XP / PCG-6E1M) Date: Wed, 30 Mar 2005 16:16:30 +0200 Message-ID: <424AB4BE.1010009@elitedvb.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Return-path: Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org I'm a bit annoyed of the way the fan behaves in my Sony Vaio S3XP / PCG-6E1M. Basically it's totally disabled until ~55=B0C, then switches on and gets faster with higher temperature. However the system tends to oscillate with a ~1min period, which is very annoying. I would rather like the fan to be active at a slow speed all the time. I noticed that there's no FAN-Resource in the DSDT. There's no active cooling entry in the thermal zone, only a passive one at 50=B0C. A quick overview over the thermal zone in the DSDT didn't show any stuff where the fan is controlled. Now there's a FAN0 entry in the embedded controller, at offset 0x93. I made a small hacking by making a kernel module which directly writes to the EC, and it works, i can set the fan speed between 0 and 0xFF. However, about one second or so after i write the value, the fan speed gets reset to the original value. reading from the EC show that the value there gets reset, too. I could not find any references inside the DSDT to the FAN0 resource in the EC, i searched for both 0x93 (the offset) and "FAN0". Even when i remove the "thermal" module, the fan behaves exactly like before. Who controls the fan when there's no thermal module active? Is there any way i can override the fan control on this machine? the dsdt: http://tmb.elitedvb.net/dsdt and the disassembled version: http://tmb.elitedvb.net/dsdt.dsl thanks, Felix ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=3D6595&alloc_id=3D14396&op=3Dclick