Opened 8 years ago

#20 new defect

SNAP fails to set MTRR registers properly with 4 GB of installed RAM

Reported by: herwigb Owned by: somebody
Priority: major Milestone: next
Component: component1 Version:
Severity: Keywords:


This is a ThinkCentre A57 with a PCIe type ATI X600 plugged into the PCIe X16 slot. The card is perfectly supported by SNAP and works properly.

However if I plug in 4 GB of RAM, SNAP fails to set the MTRR registers properly for write combining. Result (as to be expected) is a much slower video performance.

Please note that after installing the problem can be overcome by disabling writecombining in SNAP and using the VFBWC.EXE utility from the above package instead to set the MTRR registers properly.

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