Gigabyte GA-965G-DS3 motherboard FAN setting disables i965G acceleration - needs caveat in Intel hardware matrix
bruce at perens.com
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.
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: 965G-DS3 (it says GA-965G-DS3 on the box)
Vendor: Award Software International, Inc.
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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