linux-kernel - Re: [PATCH 1/1] x86: Added support for Acer Aspire 5755G fan control.

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Date:	Sat, 29 Sep 2012 16:32:05 +0300
From:	Tero Keski-Valkama <tero.keski-valkama@...er.fi>
To:	Borislav Petkov <bp@...en8.de>,
	Tero Keski-Valkama <tero.keski-valkama@...er.fi>,
	linux-kernel@...r.kernel.org, peter@...e.net
Subject: Re: [PATCH 1/1] x86: Added support for Acer Aspire 5755G fan control.

I dumped a working registry by booting with acpi=off kernel parameter.

<dump>
EC RAM:

00: 02 00 00 00 02 02 00 01 00 09 00 00 00 00 00 00
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
50: 00 00 00 00 00 22 00 00 00 00 00 00 00 00 00 fe
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 53 41 4e 59 4f 00 00 00 00 41 53 31 30 44 33 31
a0: 00 00 00 80 c1 00 00 5f ff 10 00 0e 64 17 81 ff
b0: 00 00 00 52 53 00 00 00 00 09 00 05 00 02 11 11
c0: 13 00 c9 0f 3f ab 65 30 30 2a 30 11 c9 0f 64 1f
d0: 00 00 00 00 19 7b 9b 24 00 00 05 0a 00 00 e0 40
e0: 00 00 00 28 10 20 10 1d 10 00 00 00 00 00 00 00
f0: 43 10 00 00 03 3f 00 00 44 00 00 00 00 00 00 00

Not dumping EC IDX RAM.
</dump>

This configuration rewritten to a registry booted with normal ACPI
kernel support actually speeds up the fan automatically in a sane
manner, and it actually puts the fan to max power when the temperature
is very high, as opposed to any other hack I have tried so far.

I still need to find out what exact registry value here causes the
normal automatic fan operation.

At least in this acpi=off configuration, 0xAB := 0x0E, as opposed to
the normal kernel boot up value of 0xAB := 0x08, but of course this is
not the only difference.

-- 
Kind Regards / Ystävällisin terveisin,

Tero Keski-Valkama, MSc(Tech)

+358 (0)46 876 0485

tero.keski-valkama@...er.fi
http://www.neter.fi
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