Gigabyte GA-965G-DS3 motherboard FAN setting disables i965G acceleration - needs caveat in Intel hardware matrix

Bruce Perens bruce at
Wed May 30 10:17:14 PDT 2007

Keith and Co.,

Changing a fan setting on my motherboard disables i965G acceleration. 
I'm not kidding.

Motherboard information:
    Manufacturer: Gigabyte Technology Co., Ltd.
    Product Name: 965G-DS3 (it says GA-965G-DS3 on the box)

BIOS Information
        Vendor: Award Software International, Inc.
        Version: F7
        Release Date: 01/11/2007


In the BIOS settings page for "PC Health Status", setting CPU Fan 
Control Method to "INTEL (R) QST" will disable the i965G acceleration. 
Flightgear goes from 15 FPS to 3.


I think the BIOS implements this particular fan control method through 
memory-mapped I/O. 4 additional MTRRs are used when it is enabled, 
leaving insufficient MTRRs for X.

This needs a caveat in the hardware matrix for the Intel driver.

Keith, I think it would be appropriate for Intel to pursue this issue 
with Gigabyte, Award, or whoever writes this BIOS feature. This is a 
hidden trap-door that makes your chipset look bad.



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