915GM Datasheet, PDF (21/48 Pages) Intel Corporation – 915GM/PM/GME/GMS and 910GML/GMLE Express Chipset

Errata
19.
Thermometer Read Register is Non-Functional with Negative
Calibration Offset
Problem:
When initializing the Thermometer counter, a negative offset will cause an overflow
condition, causing the counter to stop. The GMCH will not update the Thermometer
Read Register (TRR) register with the correct temperature trending values and the
TRR will display “FF”. All other thermal sensor features will still work (throttling, trip
points and interrupts) since these do not use the thermometer mode.
Implication: Thermometer Read Register (TRR) is not functional with negative Thermal Calibration
Offset value (TCO).
Workaround: Please contact your Intel representative for the latest information.
Status:
For the steppings affected, see the Summary Tables of Changes.
20.
Potential Electrical Spec Violation if an SO-DIMM Is Only Populated in
Channel B
Problem:
When DDR or DDR2 memory devices are present on channel B, but not channel A,
memory control logic only looks at channel A and incorrectly performs Rcomp value
update. This could cause an electrical spec violation internal to the chip.
Implication: System with 915PM/GM/GME, or 910GML/GMLE may hang or experience other
anomalous system behavior. No impact on system with 915GMS.
Workaround: It is possible for BIOS to contain a workaround. Contact your Intel Field
Representative for more details.
Status:
For the steppings affected, see the Summary Tables of Changes.
21.
LVDS Panel Power Down Timing Violation during System Reset
Problem:
During system reset, there is insufficient time for handshake between ICH and GMCH
LVDS logic. As a result, timing from panel backlight enable going low to LVDS data
going low (TX) and timing from LVDS data going low to panel VCC enable going low
(T3) do not match the programmed values. Panel backlight enable (LBKLT_EN), panel
Vcc enable (LVDD_EN) and LVDS data lines go low at the same time.
Implication: No system level issues have been observed.
Workaround: None
Status:
For the steppings affected, see the Summary Tables of Changes.
Specification Update
21