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Fan Firmware Trip Points?

post #1 of 6
11/26/05 at 5:22am
Thread Starter 
Hello,
Does anyone have any numbers on the trip points for the S1 and S2 versions of the fan firmware for a Sager 4750?

If someone had temp trip points for both of these, the information would be helpful. I would like for my fan on/off trip point to be about 40C instead of 35 in hopes of making my computer a bit quieter. Doing a hex comparison of the S1 and S2 firmware shows only 3 byte difference between the 2 files.

2 of the different bytes are the string "S1S1" in firmware S1 is changed to "S2S2" in firmware S2, the 3rd byte is 35(dec) in S1 is changed to 25(dec) in S2. If I knew what the difference between these two versions is I might be able to figure out what that byte means. Otherwise, I don't think I'm gonna mess with flashing hacked bios images into my laptop

Oh, and on a side note, the fan firmware is kept in the keyboard bios right? (Sorry if I'm getting technical terms mixed up, you get what I mean). If I were to screw up my keyboard bios, the computer would still boot, right? And hopefully I'd be able to find a way to reflash a good bios?
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post #2 of 6
11/28/05 at 11:14pm
use mobmeter, increase processor usage and listen to the fans. that should be good enough to get the trip points.
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post #3 of 6
11/30/05 at 2:15pm
This method is OK for KBC version 1.00.01.
It gives 55C for fans switch on (at low speed) and 40C for
fans switch off temps.

For S2 version of firmware one obtains 40C switch on temp.
To get switch off temp for S2 one is to work at laptop/portable power mode
placing, additionally, the laptop into fridge .
At normal room temp I could only see
that this temp is less or equal 25C: the equilibrium temp for "lazy" processor
newer falls below 26C, so the fans are working practically constantly (at
low speed, producing much lower noise than that from the same
fridge ).
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post #4 of 6
12/14/05 at 4:20pm
2 chis101:

Would You please send me via e-mail the whole Bios version,
containing S1 firmware? Or, at least, bin file with this firmware?

You can instead just tell me the position of the third different byte
inside this file, because I have the S2 bin file (H8-S2.bin or something like that) so I can produce S1 file from S2 file using this info.
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post #5 of 6
12/15/05 at 12:15am
Thread Starter 
I'm too much of a pansy to flash unofficial firmware, so I'm not going to edit one myself..

Since I posted last my harddrive went bad, so I lost all my information and can't tell you the position ... but I'll email you the fan firmware.
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post #6 of 6
12/16/05 at 4:16pm
Thank You very much chis101!

I will try to disassemble the code (IDA seems to understand instruction set
of Hitachi's H8* processors), to extract from it positions,
values and meaning of all data, determining
active cooling policy of the laptop.

Not that I understand much of H8 assembly language --
I've never faced with it before, but "an attempt is not torture"
as Russians say.
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